Talk:Colorectal cancer/Archive 1

Question about asprin & BCG
Does anyone know why combination therapy using asprin and BCG isn't more popular? It seems safer and less expensive.


 * Well, start conducting trials whether it also decreases mortality. JFW | T@lk  22:50, 7 August 2005 (UTC)

Alternative explanation for epidemiology
The prevention section states: Lifestyle: The comparison of colorectal cancer incidence in various countries strongly suggests that sedentarity, overeating (= high caloric intake), and perhaps a diet high in meat (red or processed) could increase the risk of colorectal cancer.

The same epidemiology strongly suggests that the use of sitting toilets increases the risk. The dietary fiber theory has been tested for decades and has been shown to be invalid. See this link

The use of squat toilets is a much more probable explanation since it is consistent throughout the developing world and pertains directly to colon hygiene. Does anyone mind if I do a brief edit on this subject? --Jonathan108 16:46, 7 October 2005 (UTC)


 * I've seen your postings before. There is more evidence for a role of fiber than for your toilet theories. Please don't do a brief edit this subject. JFW | T@lk  21:39, 9 October 2005 (UTC)


 * Hear, hear. You (Jonathan108) keep saying there is evidence for your toilet theories but I have yet to read any that qualifies as good evidence. Besides, while the dietary fiber theory might be taking some hits, that does not mean that it implies that your theory is better. Just because A does not imply B, that does not mean that not A implies B. Alex.tan 20:33, 21 October 2005 (UTC)


 * Of course it doesn't mean that my theory is better. It only means that something new is needed.  My theory is quite plausible from many different angles, and was even advocated by Dr. Denis Burkitt, the originator of the fiber theory.  It deserves to be considered, and not dismissed out of hand as you both seem to have done.--Jonathan108 16:36, 2 April 2006 (UTC)

Proving causation is really difficult, and your ideas qualify as WP:NOR. How do you propose testing for your hypothesis? I can think of several methodological hurdles you'll have to jump before your opinion can be proven scientifically. Wikipedia is not the forum for this sort of delibrations. Please try a blog. Cheers. JFW | T@lk  23:57, 2 April 2006 (UTC)

I would like to offer piece of epidemiologic evidence for thought. There is a large immigration of Japanese to Hawaii. The incidence of colorectal cancer in Japan is low and the incidence in Hawaii is moderately high. Studies of immigrant populations demonstrate that the incidence of colorectal cancer in the Japanese rises to Hawaiian levels following immigration. For sporadic colorectal cancer, this demonstrates the importance of an environmental contributions. I will provide the relevant reference in this location when I have it.Jcromwell 14:52, 19 November 2006 (UTC)


 * True, but the same migrant cancer risk story holds for female breast cancer. Ideally your conclusion from that observation should embrace both diseases (if in fact they are separate diseases), and dietary change offers one possibility. Toilet design, to my eye, does not. --Dan 20:37, 26 March 2007 (UTC)


 * There is another western habit that offers a very plausible explanation for the migrant breast cancer risk. See this link http://chetday.com/breastcancerandbras.htm  --Jonathan108 01:21, 29 March 2007 (UTC)


 * So you're saying Japanese women don't wear bras whilest in Japan and start wearing them after moving to Hawaii, thereupon increasing their breast cancer risk? And furthermore this bra-wearing habit increases over three generations, thereby increasing the breast cancer risk from the baseline Japan risk up to standard US risk over a period of roughly 75 years? --Dan 18:46, 4 April 2007 (UTC)


 * Continuing the debunking of this notion, it is well-known that obesity is a strong risk factor for breast cancer. This would be something that increases in migrant groups and that is associated with tight bras as well. Here's an abstract of a recent paper:

Int J Cancer. 1999 Jul 2;82(1):23-7. Stage of breast cancer in relation to body mass index and bra cup size.

Division of Cancer Prevention and Control, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA. ixh1@cdc.gov

Most studies on women with breast cancer indicate that obesity is positively associated with late-stage disease. Some results have shown a similar relationship between breast size and stage. A recent study found that the association between body mass index (BMI) and stage was limited to cancers that were self-detected, suggesting that the BMI-stage relation may be due to delayed symptom recognition. We examined the relationships between stage and both BMI and breast (bra cup) size, stratified by method of detection, using data from a population-based case-control study of 1,361 women (ages 20-44 years) diagnosed with breast cancer during 1990-1992. Height and weight measurements and information on bra cup size, method of cancer detection and other factors predictive of stage at diagnosis were collected during in-person interviews. A case-case comparison was conducted using logistic regression to estimate odds of regional or distant stage rather than local stage in relation to BMI and bra size. Odds of late-stage disease were increased with higher BMI [adjusted odds ratio (OR) for highest to lowest tertile = 1.46, 95% confidence interval (CI) 1.10-1.93] and larger bra cup size (OR for cup D vs. cup A = 1.61, 95% CI 1.04-2.48). These relationships were not modified by the method of detection. Differences in etiologic effects, rather than differences in detection methods, may explain the relations observed between stage and both BMI and breast size. --Dan 18:53, 4 April 2007 (UTC)


 * Neither of the above comments debunks the notion. Obesity would increase the pressure of the bra on the lymphatic system.  Obesity is also associated with increased time spent wearing a bra, since bralessness would be more embarassing for obese women.  --Jonathan108 11:26, 5 April 2007 (UTC)

Smoking
The article states "Smokers are more likely to die of colorectal cancer than non-smokers", but doesn't give any source for the fact or indication of how much of an increased risk smoking presents. I googled the info and came up with a study conducted by the American Cancer Society that supports the claim. I'll edit accordingly. -- ktaylor


 * Thanks, well done. Perhaps we should start using Footnote4 here. JFW | T@lk  13:35, 12 October 2005 (UTC)

While there is a clear link between smoking and colorectal cancer, the distinction should be made that there has not yet been an etiological link found between smoking and colon cancer, only a clinically significant correlation.Mbruzek (talk) 22:15, 12 November 2009 (UTC)mbruzek

J Clin Gastroenterol. 2009 Sep;43(8):747-52. Smokers as a high-risk group: data from a screening population.

Anderson JC, Latreille M, Messina C, Alpern Z, Grimson R, Martin C, Hubbard P, Shaw RD.

Division of Gastroenterology, University of Connecticut, Farmington, CT, USA. JoAnderson@UCHC.edu

GOAL: To determine the number of pack-years exposure associated with a 2-fold increase risk for significant colorectal neoplasia and to examine the risk of smoking in younger patients. BACKGROUND: Cigarette smoking has been shown to be a significant risk factor for colorectal neoplasia and may be used to stratify patients for screening or triaging of screening resources. However, more information is needed regarding the amount of exposure required to significantly increase by 2-fold an individual's risk for colorectal neoplasia. METHODS: Data collected for 2707 patients presenting for screening colonoscopy included tobacco use measured in pack-years and known risk factors for colorectal neoplasia. Our outcome was endoscopically detected significant colorectal neoplasia that included large (>1 cm) tubular adenomas, villous adenomas, multiple (3 or more) adenomas, high-grade dysplasia, and adenocarcinoma. RESULTS: Patients who smoked more than 30 pack-years were more than 2 times more likely to have significant colorectal neoplasia than patients who never smoked (odds ratio: 2.40; 95% confidence interval: 1.65-3.50). For patients aged 40 to 49 years, smokers were more likely than nonsmokers to have significant colorectal neoplasia (odds ratio: 2.71; 95% confidence interval: 1.05-6.97). CONCLUSIONS: '''Patients who have smoked more than 30 pack-years had a more than 2-fold increase for significant colorectal neoplasia as compared with nonsmokers. The increased risk was also observed in younger patients. Our data have implications for screening guidelines.'''

—Preceding unsigned comment added by Ocdcntx (talk • contribs) 17:17, 13 February 2010 (UTC)

Third or fourth most common cancer
An anonymous editor 209.7.119.196 feels that colon cancer is the fourth 	most common form of cancer and the second leading cause of death among cancers in the Western world. However, at least in the U.S., it is the third most common form of cancer according to the American Cancer Society colorectal cancer facts & figures. Andrew73 20:35, 15 December 2005 (UTC)

Fiber, yes but
In last week's JAMA it was found that ''dietary fiber intake was inversely associated with risk of colorectal cancer in age-adjusted analyses. However, after accounting for other dietary risk factors, high dietary fiber intake was not associated with a reduced risk of colorectal cancer.'' JFW | T@lk  14:26, 25 December 2005 (UTC)


 * That's an interesting article, even though it's almost a meta-analysis. There seems to be an implcation that dietary fiber is acting as a proxy for folate intake. Here's a quote from the paper:

"In the age-adjusted model, dietary fiber intake was significantly associated with a 16% lower risk of colorectal cancer in the highest quintile compared with the lowest (pooled age-adjusted RR = 0.84; 95% CI, 0.77-0.92) (Table 2). This association was attenuated slightly but still remained statistically significant after adjusting for nondietary risk factors, multivitamin use, and total energy intake (multivariate model I). Additional adjustment for dietary folate intake further weakened the association (multivariate model II). In the final model, which further adjusted for red meat, total milk, and alcohol intake, only a nonsignificant weak inverse association was found (pooled RR = 0.94; 95% CI, 0.86-1.03; P for trend = .75; multivariate model III). " --Dan 20:44, 26 March 2007 (UTC)

Deleted alternative therapies
This may be controversial, but I deleted the alternative therapies section; therapies of unproven value such as mistletoe, etc. should not be given the same weight as therapies with proven benefit such as chemotherapy, etc. Thoughts? Andrew73 16:45, 26 December 2005 (UTC)


 * Since there were no references cited in that section of the article, it was probably best to remove it. It might be possible to have such a section if it described studies of the "alternatives". I'm not sure that any of the alternatives that were listed are really significant.

--JWSchmidt 17:39, 26 December 2005 (UTC)
 * Ginger: Chemopreventive efficacy of ginger, a naturally occurring anticarcinogen during the initiation, post-initiation stages of 1,2 dimethylhydrazine-induced colon cancer; clinical trials
 * There is active research on curcumin and colon cancer. There are some clinical trials for curcumin and colon cancer.
 * Mistletoe: Recombinant mistletoe lectin induces p53-independent apoptosis in tumour cells and cooperates with ionising radiation, clinical trials
 * Acupuncture: A recent review cites published evidence that acupuncture can have benefits for "controlling chemotherapy-induced nausea and vomiting"; clinal trial for colon cancer.


 * Thanks for digging up the information. It seems that some of the information is for supportive therapies, i.e. to prevent nausea or vomiting, or preclinical testing.  The clinical trials with curcumin may have potential, but overall, the information listed probably isn't notable enough to be in the article.  Andrew73 17:45, 26 December 2005 (UTC)

I'm generally in favour of mentioning commonly used alternative remedies in a seperate section, but only if there is an indication that this is indeed commonly used, popular etc. Even those with a demonstrated benefit in trials may not necessarily be included if nobody uses them. JFW | T@lk  17:52, 26 December 2005 (UTC)

List of victims
Suddenly this page had a list of people with colorectal cancer. Many of them were of dubious notability, and none have changed the public perception of colorectal cancer. I have removed the list and strongly discourage its recreation. Generally speaking, these lists are unnecessary, unencyclopedic, indiscriminate collections of information etc etc. Personally I would include only people of international fame whose illness has made a change in the public perception of the disease, such as Kylie Minogue and breast cancer or Michael J. Fox with Parkinson's disease. JFW | T@lk  18:11, 22 March 2006 (UTC)

Surveillance
This subject heading could be merged into prevention under the heading of secondary prevention. --Mansell 08:56, 9 June 2006 (UTC)

Liver mets
Gut this week: resection of liver mets. JFW | T@lk  19:32, 11 July 2006 (UTC)

Good Article nomination has failed
The Good article nomination for has failed
 * More than half of this article consists of lists. These need to be re-written as prose.  Also, very short sections should either be expanded or merged.  Worldtraveller 14:45, 12 July 2006 (UTC)

Recent modifications
Hi I am a medical student in Hong Kong and I have modified the article to make it more comprehensive and (hopefully) easier to read.
 * symptoms: i have categorised it according to bowel symptoms, constitutional symptoms (due to catabolic effect of tumor) and also symptoms of systemic metastasis. Some new symptoms were added, e.g. tenesmus. Melena is not PR bleeding nor hematochezia (bloody stool). Anaemia is a diagnosis but not a symptom. Pallor and hepatomegaly are clinical presentations (signs) instead of symptoms.
 * Dukes classification: it is still commonly used among surgeons since it guides management and indicates prognosis
 * Surgery: I have further categorised it into curative, palliative, bypass, fecal diversion and open-and-close according to surgical principles. Please note the differences between surgical management in colon cancer and rectal cancer.
 * Radiation: also, I have summarised the paragraph, and please note the differences between colon and rectal cancer.

I think the format of the article can be improved, however I don't have time to do it at the same time. Maybe someone else would like to take up this job? sctonyling 16:43, 18 July 2006 (UTC)

added external links to nccn.org and also added other viable screening modalities currently implemented.--Vtak 03:49, 18 August 2006 (UTC)

Per rectal bleeding
Please kindly note that per rectal bleeding is not peri-rectal bleeding. Per rectal bleeding refers to bleeding through the rectum; "peri" is a prefix meaning surrounding, making the term "bleeding surrounding the rectum". sctonyling 05:08, 13 August 2006 (UTC)
 * Or it may read easier without "per." Andrew73 04:18, 14 August 2006 (UTC)
 * if we put it as rectal bleeding, it means "bleeding from the rectum", which is difficult from per rectal bleeding (bleeding through the rectum). To prompt easier reading, I have changed that into "bleeding through rectum (per rectal bleeding)". In the same essence, I have edited the passage so that medical terminologied precedes with layman explanation. I have as well categorised the symptoms for easier reading.sctonyling 04:41, 16 August 2006 (UTC)
 * I think bleeding through the rectum just confuses things. Doesn't make any sense -- Samir   धर्म 04:46, 16 August 2006 (UTC)
 * "Rectal bleeding" is standard terminology. I haven't heard of anyone describing this as "bleeding through rectum," but this may reflect my American bias!  Andrew73 12:42, 16 August 2006 (UTC)

Reduction in calibre of feces
Newly added in section Symptoms.sctonyling 04:41, 16 August 2006 (UTC)

Africans vs. African Americans
Consider this statistic:  Colon cancer is nearly 15 times as common in black Americans as in Africans.

The reference for this statistic is the Journal of the Royal Society of Medicine, cited here:

Temple NJ, Burkitt, DP, The war on cancer--failure of therapy and research: discussion paper, J R Soc Med. 1991 February; 84(2): 95–98. online at http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1293097

Now that the fiber theory has been disproved, how do we explain this statistic? --Jonathan108 18:21, 19 February 2007 (UTC)


 * Well, not your squat toilets, for sure. Can you please go away? JFW | T@lk  21:42, 19 February 2007 (UTC)


 * Oh, the fibre theory is not dead yet. And African-Americans get colorectal cancer from overcooked hamburgers and being overweight - both recognised risk factors well beyond your silly loos. JFW | T@lk  21:47, 19 February 2007 (UTC)

If you still believe the fiber theory, I suggest you read this article from the Boston Globe.

Strange that you would cling to Burkitt's fiber theory and regard his other theory with such contempt. It was published in prestigious peer-reviewed journals like the Journal of the Royal Society of Medicine. Are their standards lower than Wikipedia's? --Jonathan108 02:02, 20 February 2007 (UTC)
 * I may have read the paper too quickly, but I don't see any explicit references to squat toilets in the JRSM paper. Andrew73 18:14, 20 February 2007 (UTC)

No, that paper didn't refer to squatting, but the following articles discuss its benefits:

D P Burkitt, Some diseases characteristic of modern Western civilization.Br Med J. 1973 February 3; 1(5848): 274–278.

Denis P. Burkitt, Br Med J. 1972 June 3; 2(5813): 556–561. Varicose Veins, Deep Vein Thrombosis, and Haemorrhoids: Epidemiology and Suggested Aetiology

Burkitt, DP, Hiatus hernia: is it preventable?, Am. J. Clinical Nutrition, Mar 1981; 34: 428 - 431. (discusses squatting in great detail)

Also, Burkitt's book, "Don't Forget Fibre in Your Diet" acknowledges that squatting could be as important as diet in preventing many "western" diseases.

Burkitt is listed as the author in 108 articles in Pubmed, but 95% of them are not available online. I'm sure that a large percentage of them also talk about squatting. --Jonathan108 22:58, 20 February 2007 (UTC)

TNM classification
The description of T1 talks about invasion through the Submucosa and into the Lamina Propria. The Lamina Propria is in fact luminal to the Submucosa (see other wikipedia article), and so this appears to be impossible. I would update it, but am not sure of the correct TNM levels for this cancer 86.8.137.70 10:59, 10 May 2007 (UTC)

Chromosome 8
Someone added a region on this chromosome as a risk factor. This is very novel and nowhere near the other syndromes. It has not even been printed, see this abstract. JFW | T@lk  19:15, 16 July 2007 (UTC)


 * According to there are numerous other regions that are relevant for colorectal cancer. Why link to one single study? JFW |  T@lk  14:28, 17 July 2007 (UTC)

Fiber theory "controversial"?
All the evidence I've seen indicates that the fiber theory is now considered erroneous. See this link (again!). Unless someone can present recent evidence to the contrary, I'm going to correct this statement: "The nature of the relationship between dietary fiber and risk of colorectal cancer remains controversial." --Jonathan108 16:31, 20 July 2007 (UTC)

Aspirin
indicates that anything less than 2 aspirin tablets (325 mg) a day for 6 years are needed to make meaningful changes to colorectal cancer risk. JFW | T@lk  07:32, 3 February 2008 (UTC)

Image is not helpful to layperson -- suggested minor aides to help
The image at http://en.wikipedia.org/wiki/Image:Colon_cancer.jpg was not helpful to me because I could not spot the described features. Maybe if I had a medical background, it would be more obvious. Suggestions: pointers indicating healthy tissue with other pointers indicating the abnormal features that were mentioned. By the way, I was Dx'd on 10/4/2007 and Wikipedia was one of my resources. Surgery was successful, it couldn't have gone better. Thanks Wikipedia and all the other resources -- they all helped in their own ways Funchords (talk) 06:35, 20 February 2008 (UTC)
 * The balance between clutter and clarity is always difficult for technical images. Instead of adding numerous circles and arrows to the image, I decided to explain it in the legend. I hope this helps. Emmanuelm (talk) 15:12, 20 February 2008 (UTC)

Funchords, I uploaded a new picture just for you. Is it better? Emmanuelm (talk) 12:40, 12 April 2008 (UTC)

Nonpolypoid (flat and depressed) colorectal neoplasms
added mention of these in the intro. http://jama.ama-assn.org/cgi/content/abstract/299/9/1027 discusses other (pre)malignant lesions of the colon that seem to be harder to detect and are more likely to be malignant. This is still in need of confirmation, and should probably be mentioned in the article but not in the introduction. JFW | T@lk  09:35, 7 March 2008 (UTC)

Error in 'Follow-up' section
The statement "Routine PET or ultrasound scanning, chest X-rays, complete blood count or liver function tests are not recommended" appears to be incorrect. My read of the cited articles indicates that such routine follow-up tests *are* recommended.

I'm not an expert, so I will defer correction of this to someone who can confirm that it is indeed an error. —Preceding unsigned comment added by R Steven Adams (talk • contribs) 21:42, 10 April 2008 (UTC)


 * Steve, I just read the NCCN Practice Guidelines 2008 document (cited in article). Follow-up is detailed in the chapter "Post-treatment surveillance". It is a bit more complicated but, overall, there is no overt mistake in the article. I would, however, shorten this section for the sake of readability. Emmanuelm (talk) 12:55, 12 April 2008 (UTC)

Chemoprophylaxis
A useful review to replace the WP:SYNTH we have now:. JFW | T@lk  15:19, 27 May 2008 (UTC)

Alcohol as a risk factor
It is widely recognized that age, polyps, smoking, Crohn's disease and some other things substantially increase the risk of colorectal cancer. Any risk caused by alcohol is uncertain.

So how can we justify creating a separate subsection exclusively to alcohol risk? As a result of this subsection, almost a third (over 31%) of the words devoted to risk factors are about alcohol.

Even harder to justify is the fact that the subsection on alcohol is a cut-and-paste of essentially the entire colorectal cancer section of the Alcohol and Cancer page. Directing readers there avoids undesirable duplication.HighSkyFlying (talk) 16:14, 20 June 2008 (UTC)


 * Good point. However, changed back the other sentences you removed and restored the referencing. --Steven Fruitsmaak (Reply) 17:52, 20 June 2008 (UTC)

Prevention
- screening prevention etc of colorectal cancer. A recent review. JFW | T@lk  21:51, 18 August 2008 (UTC)

Weasel words
was tagged in November 2007 as containing weasel words, but I'm not sure that we can really meet the editor's desire that we "remove 'most', 'should be', 'probably', replace with direct statements." The science is not crystal clear. Many of the things that we once believed about prevention turned out to be useless. While I think the section could use some copyediting, words like "most", "should" and "probably" appropriately indicate the precarious state of our knowledge and should probably be kept. Does anyone else have any opinions? WhatamIdoing (talk) 18:41, 13 October 2008 (UTC)

Smoking
Meta-analysis: smoking strongly associated with colorectal cancer risk http://jama.ama-assn.org/cgi/content/abstract/300/23/2765 JFW | T@lk  22:51, 16 December 2008 (UTC)

Anderson JC, Latreille M, Messina C, Alpern Z, Grimson R, Martin C, Hubbard P, Shaw RD.

Division of Gastroenterology, University of Connecticut, Farmington, CT, USA. JoAnderson@UCHC.edu

GOAL: To determine the number of pack-years exposure associated with a 2-fold increase risk for significant colorectal neoplasia and to examine the risk of smoking in younger patients. BACKGROUND: Cigarette smoking has been shown to be a significant risk factor for colorectal neoplasia and may be used to stratify patients for screening or triaging of screening resources. However, more information is needed regarding the amount of exposure required to significantly increase by 2-fold an individual's risk for colorectal neoplasia. METHODS: Data collected for 2707 patients presenting for screening colonoscopy included tobacco use measured in pack-years and known risk factors for colorectal neoplasia. Our outcome was endoscopically detected significant colorectal neoplasia that included large (>1 cm) tubular adenomas, villous adenomas, multiple (3 or more) adenomas, high-grade dysplasia, and adenocarcinoma. RESULTS: Patients who smoked more than 30 pack-years were more than 2 times more likely to have significant colorectal neoplasia than patients who never smoked (odds ratio: 2.40; 95% confidence interval: 1.65-3.50). For patients aged 40 to 49 years, smokers were more likely than nonsmokers to have significant colorectal neoplasia (odds ratio: 2.71; 95% confidence interval: 1.05-6.97). CONCLUSIONS: '''Patients who have smoked more than 30 pack-years had a more than 2-fold increase for significant colorectal neoplasia as compared with nonsmokers. The increased risk was also observed in younger patients. Our data have implications for screening guidelines.'''

[PubMed - indexed for MEDLINE] —Preceding unsigned comment added by Ocdcntx (talk • contribs) 17:18, 13 February 2010 (UTC)

Murder by bullet point
This article is completely stuffed with bullet point lists. That may be fine for a medical revision paper, but it is not fine for an encyclopedia article. I have revised the "symptoms" section but clearly more work is needed on the rest. JFW | T@lk  10:31, 29 March 2009 (UTC)

Anal cancer versus colorectal cancer
Farrah Fawcett apparently recently died from anal cancer, which has created some confusion. Colorectal cancer and anal cancer are NOT the same diseases. Almost all colorectal cancer starts from adenomatous polyps in the colon and rectum. Risk factors for colorectal cancer are discussed in this article and include alcohol, family history, inflammatory bowel disease, smoking, high fat/high red meat diet, etc. In contrast, a significant portion of anal cancer is caused by exposure to viral infections like human papilloma virus (HPV). Therefore, risk factors for anal cancer include things like receptive anal intercourse. HPV is the same virus that causes most cases of cervical cancer and in fact anal pap smears are recommended in many high risk patients. The epidemiology, risk factors, and prevention of colorectal cancer and anal cancer are much different.S001bjw (talk) 23:44, 30 June 2009 (UTC)s001bjw

Notable people diagnosed with colorectal cancer
This section will just grow and grow ad nauseam. Do you think we should start a new page for listing everyone who has, or had colorectal cancer and reduce the section on this page? Nunquam Dormio (talk) 07:17, 20 July 2009 (UTC)
 * I think it's OK to have a notable people, but not every Tom, Dick and Harry. A new page just exacerbates it. Those that used their disease to help lift the profile, particularly of early detection and intervention should be listed. What about having a count limit, e.g. 10? peterl (talk) 08:37, 20 July 2009 (UTC)
 * For me "Rod Roddy - second announcer for The Price is Right" is definitely in the "every Tom, Dick and Harry" class and I'd limit the list to internationally known figures such as Reagan, Pope John-Paul, Wilson and perhaps Aquino. However, some people think that one of Wikipedia's strengths is the level of detail it can bring to a topic and creating a separate page is one option. See for example
 * List of notable breast cancer patients according to occupation
 * List of notable breast cancer patients according to survival status
 * I don't have a strong view other than that the existing list is already too long. Rather than just simply prune it, I've put it up for discussion and I hope some consensus and way forward can arise. Nunquam Dormio (talk) 09:05, 20 July 2009 (UTC)
 * Certainly the list is too long. Although I had never heard of Rod Roddy, I actually think he is valuable in this list due to his campaigning for early colonoscopy. I'd get rid of Malcolm Marshall, Tony Snow, Joel Siegel, Carmen Marc Valvo and Vince Lombardi.
 * Maybe we should consider what is a good criteria for inclusion? Just a list of people that had it serves no real purpose. I'd go for really actually world-wide notable (not just US-centric), or had some significant influence on raising the profile of the disease. peterl (talk) 07:35, 21 July 2009 (UTC)

I've moved the full list here before pruning it:
 * Corazon Aquino, former president of the Philippines who passed away Aug 1, 2009 at a ripe age of 76..
 * Achille-Claude Debussy, French composer
 * Babe Didrikson Zaharias, American athlete
 * Audrey Hepburn died January 20, 1993
 * Eartha Kitt died December 25, 2008
 * Peggy Lipton
 * Malcolm Marshall, West Indian and Hampshire Cricketer
 * Jay Monahan, husband of news anchor Katie Couric, died of colon cancer in 1998 at the age of 42; Couric became a spokesperson for colon cancer and an increase in screening rates is attributed to publicity generated by her.
 * Elizabeth Montgomery, American actress, died at age 62, 8 weeks after diagnosis.
 * Ronald Reagan
 * Charles Schulz, creator of Peanuts, died at age 77; 60 days after diagnosis.
 * Tony Snow died July 12, 2008 at the age of 53.
 * Harold Wilson, former Prime Minister of the United Kingdom
 * Lynn Faulds Wood, former BBC Watchdog presenter, survived advanced bowel cancer and founded the charities Beating Bowel Cancer and Lynn's Bowel Cancer Campaign.
 * Bobby Moore, 1966 England World cup winning captain, died at age 51, 2 years after diagnosis.
 * Joel Siegel, Emmy award winning film critic and Entertainment Editor of ABC's Good Morning America
 * Carmen Marc Valvo, American Evening-wear designer
 * Vince Lombardi
 * Rod Roddy - second announcer for The Price is Right, died on October 27, 2003, 2 years after being diagnosed with colon cancer.
 * Sharon Osbourne, wife of Ozzy Osbourne, was diagnosed with colon cancer in 2002. The cancer was spread to her lymph nodes, but she survived against a 33% survival prognosis.
 * Darryl Strawberry
 * Karol Józef Wojtyła (Pope John Paul II)

I can't see the point of having such a section, yet only including a tiny number of people. Why include Corazon Aquino, but not Walter Matthau? Why include Harold Wilson but not Bobby Moore? A list such as one of the two that exist for those diagnosed with breast cancer would be the best solution. Qzm (talk) 10:05, 15 September 2009 (UTC)
 * Politicians have lasting historical significance. Actors and footballers will be forgotten in a 100 years. If you want to set up a dedicated page, feel free. Nunquam Dormio (talk) 10:41, 15 September 2009 (UTC)
 * I've re-added Rod Roddy to list, because of point 4 - he furthered the prominance of the disease and encouraged others to get a colonoscopy. peterl (talk) 09:08, 13 October 2009 (UTC)

I've created a new article, List of people diagnosed with colorectal cancer to take the all the names. Nunquam Dormio (talk) 07:27, 13 October 2009 (UTC)

Research for an epidemiology section. Percentage risk per decade (table) - overall risk by gender & ethnicity
Article needs an epidemiology section.

Terrific table giving risk per decade at http://www.colon-cancer.net/Colon_Cancer_Statistics.html

†Source: Ries LAG, Melbert D, Krapcho M, Stinchcomb DG, Howlader N, Horner MJ, Mariotto A, Miller BA, Feuer EJ, Altekruse SF, Lewis DR, Clegg L, Eisner MP, Reichman M, Edwards BK (eds). SEER Cancer Statistics Review, 1975–2005, National Cancer Institute. Bethesda, MD, based on November 2007 SEER data submission, posted to the SEER Web site, 2008.

For incidence figures, not adjusted by age (so less helpful but still interesting) see CDC's table at http://www.cdc.gov/Features/dsColorectalCancer/ —Preceding unsigned comment added by Ocdcntx (talk • contribs) 16:36, 13 February 2010 (UTC)

Smoking 30 pack-years doubles colon cancer even in young smokers.
Anderson JC, Latreille M, Messina C, Alpern Z, Grimson R, Martin C, Hubbard P, Shaw RD.

Division of Gastroenterology, University of Connecticut, Farmington, CT, USA. JoAnderson@UCHC.edu

GOAL: To determine the number of pack-years exposure associated with a 2-fold increase risk for significant colorectal neoplasia and to examine the risk of smoking in younger patients. BACKGROUND: Cigarette smoking has been shown to be a significant risk factor for colorectal neoplasia and may be used to stratify patients for screening or triaging of screening resources. However, more information is needed regarding the amount of exposure required to significantly increase by 2-fold an individual's risk for colorectal neoplasia. METHODS: Data collected for 2707 patients presenting for screening colonoscopy included tobacco use measured in pack-years and known risk factors for colorectal neoplasia. Our outcome was endoscopically detected significant colorectal neoplasia that included large (>1 cm) tubular adenomas, villous adenomas, multiple (3 or more) adenomas, high-grade dysplasia, and adenocarcinoma. RESULTS: Patients who smoked more than 30 pack-years were more than 2 times more likely to have significant colorectal neoplasia than patients who never smoked (odds ratio: 2.40; 95% confidence interval: 1.65-3.50). For patients aged 40 to 49 years, smokers were more likely than nonsmokers to have significant colorectal neoplasia (odds ratio: 2.71; 95% confidence interval: 1.05-6.97). CONCLUSIONS: '''Patients who have smoked more than 30 pack-years had a more than 2-fold increase for significant colorectal neoplasia as compared with nonsmokers. The increased risk was also observed in younger patients. Our data have implications for screening guidelines.'''

[PubMed - indexed for MEDLINE] —Preceding unsigned comment added by Ocdcntx (talk • contribs) 17:20, 13 February 2010 (UTC)

Under 'risk tactors' the second illustration is blocking text
Sorry, I don't know how to fix it myself. Rebele | Talk The only way to win the game is to not play the game. 05:29, 15 June 2010 (UTC)

Opening 'External Links' beyond dmoz.org
I added a link to an NIH resource. Warning potential editors that they should not add material without first asking permission in Talk feels contrary to community standards. jk (talk) 07:03, 16 April 2011 (UTC)
 * OK - it looks like Stevenfruitsmaak (talk) added this comment about asking permission on 30 September 2008 and rm all links, leaving only dmoz.org. Later editors continued directing others to DMOZ. I disagree with this assertion based upon The External Links guidelines. See also discussion on External Links/Noticeboard. The External Links section is not a one-link section! Granted it attracts spam, but a nice set of useful, vetted, NPOV and nonduplicative links are needed by casual readers. Sending readers off to DMOZ for ALL external links is an odd compulsion! Is there some specific reason for this -- in the medical community for instance? jk (talk) 07:53, 16 April 2011 (UTC)

please fix the epidemelogy section edits I made
Hi,

I've added some info to this section but it's appearing oddly and I'm new to this please could somebody fix it and it would be really helpful if you could let me know what was happening. — Preceding unsigned comment added by Matt wickenden (talk • contribs) 12:27, 28 September 2011 (UTC)

Review of colorectal cancer from the Lancet
Doc James (talk · contribs · email) 23:56, 17 December 2011 (UTC)

Targeted CC therapy
|CC article,|msg Re:References The Kannagi paper is an extensive review of biomarkers moving toward a cheap quantitative peripheral blood determination for cimetidine coadjuvant treatments, suitable for the socialized medical program of Japan. He briefly shows the scope of this discussing cimetidine vis a vis Matsumoto (2002), which concerns high risk stage II and III CRC. High risk due to overexpressed VEGF and EGFR and/or lack of immune response to tumors, all of which cimetidine addresses in patients identified by tumor tissues stained with CA19-9 and CSLEX. Kannagi's carbohydrate biomarker work been published by the National Academy of Sciences in the US.--Stageivsupporter (talk) 05:23, 13 February 2012 (UTC)

Needs more on current R&D
Eg. main drugs in phase III trials or awaiting US FDA or EU approval. - Rod57 (talk) 00:12, 4 September 2012 (UTC)
 * If you can find a recent secondary source that puts the current research in perspective feel free to add it. Doc James  (talk · contribs · email) (if I write on your page reply on mine) 06:26, 13 September 2012 (UTC)

CRC and its relationship to Ulcerative Colitis
"People with inflammatory bowel disease account for less than 2% of colon cancer cases yearly.[11] In those diagnosed with UC, 2% get colorectal cancer after 10 years, 8% after 20 years, and 18% after 30 years.[11] In those with ulcerative colitis approximately 20% develop tumors within the first 10 years.[11]"

[11] Triantafillidis JK, Nasioulas, G, Kosmidis, PA (Jul 2009). "Colorectal cancer and inflammatory bowel disease: epidemiology, risk factors, mechanisms of carcinogenesis and prevention strategies.". Anticancer research 29 (7): 2727–37. .

Within the article from Triantafillidis et al, I believe the above part of the Wiki is in reference to: "Duration of UC is among the most important risk factors for CRC development. Retrospective data show a 5.4% CRC incidence rate among patients with pancolitis. In a cohort of patients with IBD for whom the median time from diagnosis of IBD to CRC was 17 years, 21% of the tumors developed before 10 years of disease " taken from an analysis done by Brackmann et al (2009).

This means that of those diagnosed with CRC, 21% of the tumors developed within 10 years of the disease. Currently, the Wiki entry suggests that of all those with UC, there is a 20% incidence rate of CRC in a 10 year span, which is grossly exaggerated. — Preceding unsigned comment added by 98.212.124.130 (talk) 05:21, 13 September 2012 (UTC)
 * Yes thanks for picking this up. Doc James  (talk · contribs · email) (if I write on your page reply on mine) 06:22, 13 September 2012 (UTC)

Causes Proposal
Currently this article has 3 separate sections 1) Causes, 2) Risk Factors and 3) Epidemiology which each essentially cover the same material, and draw on the same research streams. Also each section tackles the topic in an incomplete and somewhat haphazard manner.  I propose that they be integrated into one section.  — Preceding unsigned comment added by Byronsharp (talk • contribs) 23:22, 27 September 2012 (UTC)

Risk calculator for External links section
Suggest adding the following to the External links section:


 * Colorectal Cancer Risk Assessment Tool — provided by the National Cancer Institute.

--Bob K31416 (talk) 22:29, 3 October 2012 (UTC)
 * US specific. So I do not think it really adds anything. Doc James  (talk · contribs · email) (if I write on your page reply on mine) 22:43, 3 October 2012 (UTC)
 * Does that consideration apply to the whole article or just the External links section? --Bob K31416 (talk) 23:17, 3 October 2012 (UTC)
 * No just to these risk tool. I am not a big fan of them. We give population based rates and things that are risk factors. Feel free to ask for a further opinion at WP:MED. Doc James  (talk · contribs · email) (if I write on your page reply on mine) 23:30, 3 October 2012 (UTC)
 * Re "I am not a big fan of them." — That sounds like you don't like risk tools in general. Perhaps you could explain your reasons? --Bob K31416 (talk) 23:39, 3 October 2012 (UTC)
 * This one in particular is fairly limited in scope (does not work for people with IBD). I would like to see a review article supporting its use. Doc James  (talk · contribs · email) (if I write on your page reply on mine) 23:55, 3 October 2012 (UTC)
 * Reconsidering, it may not be sufficiently reliable to be useful. For example, the question asked about whether or not the user had a colonscopy or sigmoidscopy in the last ten years. So I can just as well leave it out.  Regards, --Bob K31416 (talk) 00:51, 4 October 2012 (UTC)

Image gallery
Jmh649, Re your edit — Why do you think it looked better before? --Bob K31416 (talk) 20:36, 14 October 2012 (UTC)
 * There is less white space and it fits better on my screen. Doc James  (talk · contribs · email) (if I write on your page reply on mine) 23:56, 14 October 2012 (UTC)
 * What do you think of grouping the 4 micrographs together on the same row? --Bob K31416 (talk) 09:33, 16 October 2012 (UTC)
 * Gone suggestion and done. Doc James  (talk · contribs · email) (if I write on your page reply on mine) 00:00, 17 October 2012 (UTC)

Poor quality source
This article was not a controlled trial and therefore can says nothing concrete about treatment other than more study is needed http://www.nejm.org/doi/full/10.1056/NEJMoa1207756 Thus removed. Doc James (talk · contribs · email) (if I write on your page reply on mine) 12:21, 31 December 2012 (UTC)

Potential discrepancy between genetic figures
Near the beginning of the article it mentions that "Greater than 75-95% of colon cancer occurs in people with little or no genetic risk.", this however doesn't seem to fit in with the statistic mentioned a few paragraphs below that states: "Those with a family history in two or more first-degree relatives have a two to threefold greater risk of disease and this group accounts for about 20% of all cases".

Are these two compatible, or should the second statement be further investigated (as it cites no sources)? 139.80.123.36 (talk) 02:42, 10 September 2013 (UTC)

Screening section in main article shockingly out of synch with above best practices for screening
In addition, separate article needed on

Colorectal cancer screening

Which should replace and subsume the current article on no-longer-recommended fecal blood testing.
 * Some refs would be great to start with. gFOBT still recommended in 2012 by ACP  Doc James  (talk · contribs · email) (if I write on your page reply on mine) 15:24, 17 September 2014 (UTC)

Is the article written in English?
Greetings,

Like so many technical WP articles (medical and other sciences), I find this article to be way too jargony for the casual Wikipedia reader. Can the authors re-work the article to make it more accessible to the anticipated readership? (After all, medical students already own textbooks to consult.) Please start off with plain language descriptions and if the reader chooses to delve deeper, have the more technical aspects at the farther end of the topic. Making all technical terms into WP links without further explanation is a losing game. A non-medically oriented person will end up hop-scotching all over WP trying to find out what a term means and what the terms used in that link mean, etc, and quit in frustration. An example from the lede: ". . .is when cancer develops in the colon or rectum (parts of the large intestine).[1]" is good. But by the third paragraph of the lede, you slide off the rails, with only a string of jargon-as-links terms without a single simple parenthetic explanation.

Thank you, Wordreader (talk) 23:36, 1 October 2014 (UTC)
 * Which bit do you want simplified? Doc James  (talk · contribs · email) (if I write on your page reply on mine) 01:39, 2 October 2014 (UTC)
 * Third paragraph doesn't look very jargony to me. The only terms I see that might be viewed as jargony are colonoscopy and sigmoidoscopy and I feel many people are likely to know what a colonoscopy entails. I have to echo the request above and ask for more specific instances of jargon. TylerDurden8823 (talk) 05:09, 2 October 2014 (UTC)

Edits in the section 5.3 Screening
Hi,

I am a researcher in the field of cancer screening and made a few edits to improve the global relevance of the provided information (it previously discussed US practices only). I have re-ordered the paragraphs so that the generic information comes before the country-specific information. Also, I have removed a paragraph about a screening test that I never heard of and looked like it was a promotional ad. Finally, I have made a few minor edits to clarify the evidence for screening and the FOBT screening trajectory.

Many thanks,

Siuhinglo (talk) 12:27, 26 November 2014 (UTC)

Preventability
I just expanded one sentence into a short paragraph on preventability (now the 2nd paragraph of the article), with an internal reference to the section on "Screening".

I would have liked to add the external link


 * Blood in the Toilet (promoting awareness of the preventability of most bowel cancers).

Disclosure: I have had the greater part of my liver removed due to secondary bowel cancers. Had I seen something like the above, six or eight years ago, the whole fiasco would have been prevented. That's not your average COI. — Preceding unsigned comment added by 118.209.31.104 (talk) 02:55, 4 January 2015 (UTC)

Small error, but I'm a wiki newbie, not sure where to put this input
In this article, FAP is said to have a 100% colon cancer association by age 40. I don’t think that is correct. Age 40 is significant in FAP because it is the mean age of cancer diagnosis, not the age by which they all have cancer. FAP has a near 100% progression to colon cancer, but the mean age is 39 (call it 40). I think that the sentence should read "FAP progresses to colon cancer in nearly 100% of all individuals, at a mean age of 39."

In fact, I am not aware of any specific age by which 100% have cancer, because I believe that 100% malignant progression is approached asymptotically with no specific associated age.

Here is the appropriate reference to clarify the issue- Bussey HJR. Familial polyposis coli. Baltimore: The Johns Hopkins University Press; 1975.

Here is a reference that discusses the median age of benign findings and some of the epidemiology of progression- Campbell WJ, Spence RAJ, Parks TG. Familial adenomatous polyposis. Br J Surg 1994;81:1722-33.

I hope that helps, I am new to this and not really sure whom to notify of an error. It isn't a big error, by any means.

Thanks.
 * The offending section must have been removed a while ago. Now links to separate page on FAP. BakerStMD T&#124;C 13:34, 20 March 2015 (UTC)

Aspirin
Meta-analysis: mortality benefit only post diagnosis. Especially those expressing PTGS2 (COX-2) expression and with mutated PIK3CA. 10.1136/gutjnl-2014-308260 JFW &#124; T@lk  10:55, 11 August 2015 (UTC)

External links modified
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 * Added archive https://web.archive.org/20060925051637/http://www.cancer.org/docroot/PRO/content/PRO_1_1_Cancer_Statistics_2006_Presentation.asp to http://www.cancer.org/docroot/PRO/content/PRO_1_1_Cancer_Statistics_2006_Presentation.asp

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Processed meat
The following was added as a risk factor:


 * processed meat

This is actually an editorial in Lancet Oncology that may have ended up on that website without permission. The DOI is /10.1016/S1470-2045(15)00444-1. I think this article in itself is a WP:MEDRS because it reviews other evidence and makes an authoritative claim, but perhaps we should cite the full report of the IARC instead. JFW &#124; T@lk  15:28, 29 October 2015 (UTC)

No section(s) on metastatic colorectal cancer
Could be mentioned in diagnosis or staging? and discussed in management ? - Rod57 (talk) 13:30, 17 December 2015 (UTC)

Aspirin
Review in Br Med Bull 10.1093/bmb/ldw028 JFW &#124; T@lk  14:24, 12 September 2016 (UTC)

External links modified
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NEJM: Screening for Colorectal Neoplasia
http://www.nejm.org/doi/full/10.1056/NEJMcp1512286 Clinical Practice: Screening for Colorectal Neoplasia John M. Inadomi, M.D. N Engl J Med 2017; 376:149-156 January 12, 2017 DOI: 10.1056/NEJMcp1512286 --Nbauman (talk) 04:39, 12 January 2017 (UTC)

External links modified
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addition of extrenal link
Hi, I think it would be valuable to add the link to the Pathology Atlas page for colorectal cancer as an external link. Understood that this should be first discussed here on the talk page. I hope you agree!?! Please see: https://www.proteinatlas.org/humanpathology/colorectal+cancer Figgep (talk) 12:35, 20 September 2017 (UTC)

Moved here
We need evidence that these cases were notable not just that the people were notable.

Doc James (talk · contribs · email) 15:22, 10 January 2018 (UTC)


 * Corazon Aquino, former president of the Philippines
 * Pope John Paul II
 * Ronald Reagan, actor and former President of the United States
 * Harold Wilson, former Prime Minister of the United Kingdom
 * Robin Gibb, musician and member of the Bee Gees
 * Humayun Ahmed, Bengali writer and film maker
 * J. B. S. Haldane, geneticist, polymath, and popular science author
 * Stephen Sutton, charity activist

Edit Request
NOTE: I am proposing this edit for FleishmanHillard on behalf of Exact_Sciences_(company). I am a paid editor and am aware of the COI guidelines. I am submitting this edit request in hopes of making the information in the article about screening and testing more thorough. Below, I have detailed where proposed additions should be included, recommended copy and related sources. Thanks for your consideration.


 * 1) Screening
 * 2) In the Screening section (under “Prevention), we propose adding the following information to the beginning of the second paragraph to provide more information about the variety of screening tests available (and reinforce the importance of screening, regardless of method): “The United States Preventive Services Task Force ranks seven different existing screening methods in equal standing, stating the best screening test is the one that gets done. ”


 * 1) In the Screening section (under “Prevention), we propose adding the following information to the end of the third paragraph to provide insight into different testing options: “Stool DNA testing has a higher sensitivity than fecal immunochemical tests and is recommended every three years by the American Cancer Society. ”

Jon Gray (talk) 22:06, 26 June 2018 (UTC) Thank you for considering these edits.

Reply 08-JUL-2018
Regards,  spintendo   06:03, 8 July 2018 (UTC)


 * comment the #2 and #3 references fail Identifying_reliable_sources_(medicine) the #1 reference is fine however it should be slightly reworded--Ozzie10aaaa (talk) 19:19, 1 August 2018 (UTC)


 * Comment This "Specificity is lower than for FIT, resulting in more false-positive results, more diagnostic colonoscopies, and more associated adverse events per screening test" is a better summary which I will add. Also added some of the other bits suggested. Doc James  (talk · contribs · email) 07:24, 2 August 2018 (UTC)

Thanks for your additions and revisions to make the article more clear and thorough. For our knowledge moving forward, what were your thoughts on the request we submitted? Is there any feedback we should keep in mind? Jon Gray (talk) 22:24, 29 August 2018 (UTC)

Fruits
Not sure why this text was removed "The evidence for a protective significant effect conferred by fruits and vegetables is unclear as of 2014"

Doc James (talk · contribs · email) 20:44, 25 October 2018 (UTC)


 * The World Cancer Report 2014, page 126, under the Fruits section:


 * "A large protective role for total intake of fruits and vegetables against overall cancer risk now appears unlikely, but specific phytochemical or botanical subgroups may reduce risks of some cancers."


 * Just because there is not "a large protective role" does not mean there would not be a clear small role (i.e., "may reduce risks of some cancers"). The "unclear" statement is incorrect.


 * On page 126, in the subsequent sentence: "Promising leads include . . . folate-rich fruits and vegetables and colon cancer." No one would describe something "promising" as "unclear".


 * Further down in [9], "fruit fibre (n=9) was 0.93".


 * The World Cancer Research Fund International noted in the latest 2017 update (https://www.wcrf.org/dietandcancer/colorectal-cancer):


 * - There is strong evidence that consuming foods containing dietary fibre (which links to "Wholegrains, vegetables & fruit") DECREASES the risk of colorectal cancer.


 * - There is some evidence that low consumption of fruit might increase the risk of colorectal cancer.


 * There is nothing "unclear" about the benefits of fruits and fiber. But for some reason you did not like WCRF International and instead cited the WHO (which does not support your "unclear" statement either). — Preceding unsigned comment added by 24.8.207.91 (talk • contribs) 03:09, 26 October 2018 (UTC)
 * The World Cancer Report is a better source. A charity is not the best source for medical content.
 * Yes "promising" does not mean "good evidence". In fact the source says a significant effect is unlikely. Doc James  (talk · contribs · email) 17:57, 26 October 2018 (UTC)


 * The 2019 WCR is out soon. Doc James  (talk · contribs · email) 19:08, 26 October 2018 (UTC)


 * The World Cancer Report, which you deleted (and then added World Cancer Research Fund, despite the above), has been restored.
 * The reference did not say "unclear" nor "not ... benefit". We should try to be impartial, and try not to make up our own words, which in this example have clear negative connotation.
 * Also, you failed to include: ", but specific phytochemical or botanical subgroups may reduce risks of some cancers".
 * You also failed to include "Promising leads include . . . folate-rich fruits and vegetables and colon cancer."
 * It is very important that we edit impartially. We must at least look at the entire sentence, or the entire paragraph, so a reference is not misconstrued. — Preceding unsigned comment added by 24.8.207.91 (talk • contribs) 03:12, 27 October 2018 (UTC)
 * It says "A large protective role for total intake of fruits and vegetables against overall cancer risk now appears unlikely" which is even strongly than unclear. Doc James  (talk · contribs · email) 04:31, 27 October 2018 (UTC)


 * I simply don't understand how "large . . . appears unlikely" can become "unclear".
 * Again, we must look at the entire sentence or the entire paragraph. What happened to ", but specific phytochemical or botanical subgroups may reduce risks of some cancers"?  What happened to "Promising leads include . . . folate-rich fruits and vegetables and colon cancer"? — Preceding unsigned comment added by 24.8.207.91 (talk • contribs) 17:54, 27 October 2018 (UTC)
 * In science the term "may" can always be substituted with "may not". "Promising" means should be researched further but unclear. Doc James  (talk · contribs · email) 18:33, 27 October 2018 (UTC)


 * In English, "unlikely" denotes probability. How does it have anything to do with "unclear"?


 * The first part of WHO's sentence is: "A large protective role for total intake of fruits and vegetables against overall cancer risk now appears unlikely".


 * Suppose, just suppose, fruits confer a 10% reduction, and legumes confer a 30% reduction. The protective role of fruits is certainly not as large as legumes.  But a 10% reduction is significant, and the significant effect is clear.  There is nothing unclear about its significant effect.


 * Don't you see the problem? You failed to look at the entire paragraph, you even failed to look at the entire sentence.  And when you take only the first part of the sentence, you misconstrued it by making up your own words for no good reason (it's highly unlikely we will have copyright issues due to "fair use").  Your "unclear" sentence is plain wrong.

Fiber
The World Cancer Report 2014, page 127, under the Dietary fibre section:

"Several large prospective cohort studies of dietary fibre and colon cancer risk have not supported an association [7], although an inverse relation was seen in the large European Prospective Investigation into Cancer and Nutrition (EPIC) study and a recent meta-analysis [8]."

[7] is from 2005, and concluded with "In this large pooled analysis, dietary fiber intake was inversely associated with risk of colorectal cancer in age-adjusted analyses. However, after accounting for other dietary risk factors, high dietary fiber intake was not associated with a reduced risk of colorectal cancer."

[8] is from 2012, and concluded with "Our results strengthen the evidence for the role of high dietary fibre intake in colorectal cancer prevention."

It is not reasonable to cite the above to conclude the Lifestyle section with "Although some studies do not support a benefit from fiber", when the WHO concluded with [8], which is also more recent.

Also, [7] actually DID find an inverse association, but it was only removed after "accounting for other dietary risk factors".

In https://en.wikipedia.org/w/index.php?title=Colorectal_cancer&oldid=865717987#Lifestyle, which Doc James deleted, there is a similar pattern of an earlier, smaller, study that failed to show association, but a later report did show association (as also shown in the 2018 study Doc James cited). — Preceding unsigned comment added by 24.8.207.91 (talk • contribs) 03:09, 26 October 2018 (UTC)
 * Yah the 2018 meta analysis I added shows potential benefit from fiber. Doc James  (talk · contribs · email) 17:59, 26 October 2018 (UTC)


 * But than we have the NCI from March 2018 that states "There is no reliable evidence that a diet started in adulthood that is low in fat and meat and high in fiber, fruits, and vegetables reduces the risk of CRC by a clinically important degree."


 * Our job is to summarize major positions. Doc James (talk · contribs · email) 19:21, 26 October 2018 (UTC)
 * agree w/ Doc James comments above--Ozzie10aaaa (talk) 20:38, 26 October 2018 (UTC)
 * NCI is seriously outdated. Instead of relying on "Overview", need to go to the "Description of Evidence" section to find out how old their references are. Also, the year 2000 study they cited is about recurrence, not in general (e.g., new incidence). This very very old and limited reference certainly should not conclude the paragraph.
 * There is a repeated pattern in which earlier studies showed no association, but later studies did. It is very important that people stop merely citing the first part of a sentence, or merely the first sentence of a paragraph. Must look at the entire sentence, or entire paragraph, so a reference is not misconstrued.
 * Yes, the World Cancer Report, which Doc James deleted despite the above, has been restored. — Preceding unsigned comment added by 24.8.207.91 (talk • contribs) 03:12, 27 October 2018 (UTC)
 * It is getting a little old. But sure we can update in 2019. Doc James  (talk · contribs · email) 22:33, 27 October 2018 (UTC)

Shorten paragraph on fruits, fiber, etc
I don't know if it's time to say enough is enough. There are now 4 sentences conveying essentially the exact same message as in:

https://en.wikipedia.org/w/index.php?title=Colorectal_cancer&oldid=865715475

before Doc James started to add and change references.

The message remains simple: "although older studies did not supported an association, more recent studies found a lower risk associated with higher fiber intake".

One can choose to cite the WCRF as before or the WHO, but the message remains the same.

It is also noted that one can pretty much find anything on the web, including from websites like PubMed or Sci-Hub. (And if one cites something not easily accessible, the presumption should be that the person is trying to hide something).

Our job is not to cite a bunch of sources, and we definitely should not cite sources partially to support a biased view. Rather, our job is to look carefully and present the best, most recent, information impartially and simply. — Preceding unsigned comment added by 24.8.207.91 (talk • contribs) 18:15, 27 October 2018 (UTC)


 * We have the NCI in 2018 who states "There is no reliable evidence that a diet started in adulthood that is low in fat and meat and high in fiber, fruits, and vegetables reduces the risk of CRC by a clinically important degree."
 * And the WCR from 2014 that says "A large protective role for total intake of fruits and vegetables against overall cancer risk now appears unlikely"
 * So no all the sources do not say "older studies do not support an association while newer ones do". What we have is some organization saying sure one can try a high fiber diet and a bunch of other organizations saying the evidence is poor and against a probable benefit. Doc James  (talk · contribs · email) 18:31, 27 October 2018 (UTC)


 * Yes, the NCI in 2018 said that by citing a study from year 2000. Is that really a good reference?  If anything, it agrees with WHO's first part of the sentence from the fiber section: "Several large prospective cohort studies of dietary fibre and colon cancer risk have not supported an association", citing a reference from 2005 (which is at least newer than 2000).


 * I was willing to forget about your clear error of misconstruing WHO's sentence from the fruits section. Yet you are bring it up again?  This is getting old.


 * The WHO concluded the sentence about fiber by then stating: "although an inverse relation was seen in the large European Prospective Investigation into Cancer and Nutrition (EPIC) study and a recent meta-analysis", citing a study from 2012.


 * Similarly, Song and Chan also started by saying that it's inconsistent, but then concluded by saying "Nonetheless, based on existing evidence, the most recent expert report from the World Cancer Research Fund and American Institute for Cancer Research in 2017 concludes that that there is probable evidence." — Preceding unsigned comment added by 24.8.207.91 (talk • contribs) 03:21, 28 October 2018 (UTC)


 * IP please read and follow this: User_talk:24.8.207.91. Jytdog (talk) 20:15, 27 October 2018 (UTC)


 * Thanks for shortening the paragraph. — Preceding unsigned comment added by 24.8.207.91 (talk • contribs) 03:53, 28 October 2018 (UTC)

Simplify paragraph on dietary factors
I was able to identify things like 1970, meat consumption, fruits and vegetables, from the cited section. So I kept the first sentence.

However, I have read the pages a few times, but I am still not able to identify the next two sentences. The prospective studies were suggested by animal studies, and the recommendation was not based on animal studies. I simply could not find "retrospective observational studies" being discussed.

I also could not find where the WHO said the studies "have failed to demonstrate a significant protective effect". The WHO did discuss challenges faced by the studies, but then discussed conclusions (starting with "Despite the challenges").

Moreover, I couldn't find where the WHO said "it is uncertain whether any specific dietary interventions (outside of eating a healthy diet) will be proven to have significant protective effects".

Rather, the WHO specifically said: "Consumption of red meat, particularly processed red meat, is related to modestly higher risks, and of fruits and vegetables to modestly lower risks of some forms of cancer."

If you could please show us how the now deleted text came about, we can try to work it in. Thank you. — Preceding unsigned comment added by 24.8.207.91 (talk • contribs) 06:31, 28 October 2018 (UTC)
 * READ AND FOLLOW THIS: User_talk:24.8.207.91
 * Stop adding commentary like "based on a paper from 2000". This is unacceptable in Wikipedia - it is not your place or mine to comment on sources in that way. Jytdog (talk) 17:25, 28 October 2018 (UTC)
 * The bottom of p432 says "In response, many case–control studies were conducted, and large prospective studies were launched and are now producing abundant data. Progress has been more difficult than anticipated by many researchers, partly because of the complexity of human diets but also due to the nature of cancer and its origins." The box starting on p 125 describes the difficulties of doing research on the effects of diet on health and includes discussion of retrospective studies. I've added the citation to that chapter. The content is summarizing the source. Jytdog (talk) 17:37, 28 October 2018 (UTC)

Queen's University Student Editing Initiative
Hello, we are a group of medical students from Queen's University. We are working to improve this article over the next month and will post our planned changes on this talk page. We look forward to working with the existing Wikipedia medical editing community to improve this article and share evidence. We welcome feedback and suggestions as we learn to edit. Thank you.

Here is a list of our proposed changes by section.

Treatment

1. Revise the opening sentences to make this section more concise. See https://en.wikipedia.org/wiki/User:Towheeds/sandbox for the proposed minor revisions.
 * Comments in Sandbox. Thanks! JenOttawa (talk) 14:23, 7 November 2018 (UTC)

2. Make note of the XELOX treatment regimen where FOLFOX, FOLFOXIRI, and FOLFIRI are mentioned. Cite a high-quality source that discusses these regimens: Fakih, M. G. (2015). Metastatic colorectal cancer: current state and future directions. Journal of Clinical Oncology, 33(16), 1809-1824. Towheeds (talk) 19:28, 5 November 2018 (UTC)
 * Please see your sandbox.JenOttawa (talk) 14:23, 7 November 2018 (UTC)

Prevention

3. Revised information about Vitamin D as a supplement in the prevention of colorectal cancer and therapeutic levels required. See https://en.wikipedia.org/wiki/User:KawaiiLeonard for revisions
 * Comments in your sandbox. Thanks!JenOttawa (talk) 14:23, 7 November 2018 (UTC)

4. Reorganized the structure of screening section and added information about iFOBT as a new standard screening tool and its advantages. See https://en.wikipedia.org/wiki/User:KawaiiLeonard for revisions.

Diagnosis

5. Revise the introduction sentence to update sources and clarify.

6. Revise immunohistochemistry section to make more comprehensive and update sources.

Please see https://en.wikipedia.org/wiki/User:Araabis/sandbox for complete edits and make comments. Araabis (talk) 22:53, 6 November 2018 (UTC)

Towheeds (talk) 19:28, 5 November 2018 (UTC)

Pathogenesis

7. Please see https://en.wikipedia.org/wiki/User:Daniel.S9607/sandbox for complete edits to the epigenetics section and make comments. — Preceding unsigned comment added by Daniel.S9607 (talk • contribs) 00:51, 7 November 2018 (UTC)

8. Incorporate discussion of mismatch repair defects in CRC. See https://en.wikipedia.org/wiki/User:13wak/sandbox for complete listing of proposed changes.

9. Include information on the polyp-CRC progression sequence. See https://en.wikipedia.org/wiki/User:13wak/sandbox for complete listing of proposed changes.

Diagnosis

10. Include information on endoscopy for patients with IBD. See https://en.wikipedia.org/wiki/User:15erm3/sandbox for revisions.

Signs and Symptoms

11. Include information about variability of symptom presentation in CRC patients. See https://en.wikipedia.org/wiki/User:15erm3/sandbox for revisions. — Preceding unsigned comment added by 15erm3 (talk • contribs) 22:03, 7 November 2018 (UTC)


 * Thanks for sharing this. JenOttawa (talk) 18:03, 6 November 2018 (UTC)

Lancet seminar
10.1016/S0140-6736(19)32319-0 JFW &#124; T@lk  11:22, 18 October 2019 (UTC)

Queen’s University Student Editing Initiative
Hello, we are a group of medical students from Queen’s University in Canada. We have been working to improve this article over the past month and will be posting our planned changes on this talk page. We look forward to working with the existing Wikipedia medical editing community to improve this article and share evidence. We welcome feedback and suggestions as we learn to edit. Thank you.

Omendoza2024 (talk) 19:49, 30 November 2020 (UTC)

Proposed Changes:

1. We propose to insert the following content into the Colorectal Cancer#Radiation therapy section:

While a combination of radiation and chemotherapy may be useful for rectal cancer,[18] chemoradiotherapy can increase acute treatment-related toxicity in patients, and has not been shown to improve survival rates compared to radiotherapy alone, although it is associated with less local recurrence. The use of radiotherapy in colon cancer is not routine due to the sensitivity of the bowels to radiation.[124] Just as for chemotherapy, radiotherapy can be used in the neoadjuvant and adjuvant setting for some stages of rectal cancer. As with chemotherapy, radiotherapy can be used as a neoadjuvant for clinical stages T3 and T4 for rectal cancer. This results in downsizing or downstaging of the tumour, preparing it for surgical resection, and also decreases local recurrence rates. For locally advanced rectal cancer, neoadjuvant chemoradiotherapy has become the standard treatment.[125, KimmyP123 (talk) 17:20, 3 December 2020 (UTC)

2. Radiation therapy has been suggested to be an effective treatment against CRC pulmonary metastases, which are developed by 10-15% of people with CRC. Omendoza2024 (talk) 23:19, 3 December 2020 (UTC)

Symptoms (diarrhea/constipation)
The article states that "worsening constipation" is a sign of colon cancer (referencing a 2009 medical book) and does not mention diarrhea.

The current NHS page on bowel cancer (https://www.nhs.uk/conditions/bowel-cancer/symptoms/) states that "pooing more often, with looser, runnier poos and sometimes tummy (abdominal) pain" is a sign of colon cancer, stating that "Constipation, where you pass harder stools less often, is rarely caused by serious bowel conditions."

Therefore there is a direct contradiction here.

What's the up to date science? I imagine many people glance at the wiki article if they have medical concerns (they shouldn't, but it's nonetheless a source for many people). The wrong information can lead people to ignore their symptoms. — Preceding unsigned comment added by 2A02:8109:9A80:1D40:E9E4:7E16:1165:4CD2 (talk) 15:05, 4 February 2021 (UTC)

Exercise
Studies with low to moderate quality, done in a 6 month follow up, have shown that people with non-advanced colorectal cancer might benefit from exercise. Physical activity helped with their cardiovascular conditioning, cancer‐related exhaustion and health‐related quality of life. Mbbasilio (talk) 21:31, 2 November 2021 (UTC)

CEA
Comment about: "Prognosis

Survival is directly related to detection and the type of cancer involved. Survival rates for early stage detection is about 5 times that of late stage cancers. CEA level is also directly related to the prognosis of disease, since its level correlates with the bulk of tumor tissue."

Whether CEA is truly of clinical use is still controversial, as far as I know.

Evidence based screening
According to the National Guideline Clearinghouse™ (NGC), a public resource for evidence-based clinical practice guidelines.

at

http://www.guideline.gov/summary/summary.aspx?doc_id=14345

Colorectal cancer screening clinical practice guideline 

MAJOR RECOMMENDATIONS

Definitions of the levels of evidence (evidence-based A-D, I and consensus-based) are provided at the end of the "Major Recommendations" field.

Recommendation 1*: Factors Associated with an Increased Risk of Colorectal Cancer in the General Population

1. A significant family history is associated with an increased risk of colorectal cancer. (See Recommendation #5, below, for screening recommendations and specific definition of family history.) (Evidence-based: A) 2. Advancing age is associated with an increased risk of colorectal cancer.** (Evidence-based: B) 3. There is fair evidence that blacks are at increased risk for colorectal cancer compared with whites. (Evidence-based: C) 4. There is fair evidence that a family history of advanced adenomas (i.e., >10 mm, with villous features or high-grade dysplasia) presenting before age 60 is associated with an increased risk of colorectal cancer. (Evidence-based: C) 5. There is insufficient evidence for or against the association of gender with an increased risk of colorectal cancer. (Evidence-based: I)


 * The Guideline Development Team (GDT) adopted a hazard ratio >2.0 as the cut-point to declare a risk factor as sufficient to warrant a screening recommendation different from that for people at average risk.


 * Indirect evidence from analyses using cancer registry, Medicare, and other surveillance data indicates that the risk of cancer and advanced colonic neoplasms increases with age.

Recommendation 2: Effectiveness of Colorectal Cancer Screening Tests

1. Colorectal cancer screening is strongly recommended for all asymptomatic, average-risk adults. (Evidence-based: A) 2. Any of the following tests are acceptable for colorectal cancer screening in asymptomatic, average-risk adults:* 3. The following additional screening tests are either less-preferred options or not recommended for screening. However, an adult who has had one of these tests is considered screened. Follow-up screening using a preferred option is recommended.
 * High-sensitivity fecal occult blood test (FOBT) (Consensus-based)
 * Immunochemical fecal occult blood test (iFOBT/FIT)** (Consensus-based)
 * Flexible sigmoidoscopy (Evidence-based: B)
 * Colonoscopy** (Consensus-based)
 * A combination of high-sensitivity guaiac FOBT test and flexible sigmoidoscopy (Consensus-based)
 * An annual standard guaiac FOBT is a less-preferred option.*** (Consensus-based)
 * Air contrast barium enema is not recommended as a screening strategy for average-risk adults. (Evidence-based: I)
 * Virtual colonoscopy is not recommended as a screening strategy for average-risk adults.* (Consensus-based)
 * Fecal DNA is not recommended as a screening strategy for average-risk adults.****(Consensus-based)

Note: For fecal blood tests, inform patients of the potential risks associated with false-positive test and false-negative test results, as well as the need for prompt follow-up of a positive test result. For flexible sigmoidoscopy, inform patients that the test has a small risk of complications and is not a complete examination of the entire colon.


 * There is insufficient evidence to choose one screening test over another.


 * If a patient has had a normal colonoscopy within the last 10 years, there is insufficient evidence that supplemental FOBT adds any incremental benefit.


 * Even though there is sufficient evidence in support of this screening modality, it is not a preferred option due to its low sensitivity and low compliance rates.


 * Please note that fecal DNA testing and virtual colonoscopy are not listed as "appropriate screening tests" in 2008 HEDIS (Health Plan Employer Data and Information Set) specifications for colorectal cancer screening, and therefore regions may choose to screen members with other appropriate tests.

Recommendation 3: Frequency of Colorectal Cancer Screening

1. The following intervals for colorectal cancer screening in asymptomatic, average-risk adults are recommended*: 2. The following additional screening tests are either less-preferred options or not recommended for screening. However, if these tests are performed, then the recommended intervals are as indicated below. Follow-up screening using a preferred option is recommended.
 * Flexible sigmoidoscopy: at least every 10 years (Consensus-based)
 * High-sensitivity guaiac or immunochemical FOBT (iFOBT/FIT): every 1-2 years (Consensus-based)
 * Colonoscopy: every 10 years (Consensus-based)
 * Combined FOBT and flexible sigmoidoscopy: every 1-2 years for FOBT, at least every 10 years for flexible sigmoidoscopy (Consensus-based)
 * Standard guaiac FOBT: every 1-2 years (Consensus-based)
 * Air contrast barium enema:** every 5 years (Consensus-based)
 * Virtual colonoscopy:** every 10 years (Consensus-based)
 * Fecal DNA:** every 5 years (Consensus-based)


 * The GDT recognizes that these screening intervals differ from current HEDIS measures. Some regions may choose to offer screening at more frequent intervals.  HEDIS intervals are as follows: FOBT (annual), flexible sigmoidoscopy (every 5 years), air contrast barium enema (every 5 years), colonoscopy (every 10 years).


 * These modalities are not recommended for screening average-risk adults (see Recommendation #2 above).

Recommendation 4: Age to Begin and End Colorectal Cancer Screening

In the absence of sufficient evidence, the following ages at which to begin and end colorectal cancer screening in asymptomatic average-risk adults are recommended:

1. Initiation of screening is recommended at age 50. (Consensus-based) 2. Discontinuation of screening is generally recommended at age 75, provided that there is a history of routine screening. For those with no history of routine screening, discontinuation is recommended at age 80. The decision to discontinue screening should be based on physician judgment, patient preference, the increased risk of complications in older adults, and existing comorbidities. (Consensus-based)

Wiki Education assignment: Reading and Writing in the Natural Sciences
— Assignment last updated by Allybio0258 (talk) 19:47, 6 February 2024 (UTC)

Hernia
Hernia lumps: downward into GROIN AREA Rick Grant Taylor (talk) 19:22, 20 March 2024 (UTC)