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Oocyte cryopreservation
Embryo cryopreservation

Oocyte cryopreservation involves the extraction and freezing of a female's eggs, to preserve their viability for future use. This is often due to medical reasons such as females undergoing cancer treatment. It is also increasingly being used for elective fertility preservation in females who are not ready to become pregnant but who are conscious of their age-related decline in fertility. This process is different to embryo cryopreservation, where mature eggs are fertilised in vitro (outside the body) with sperm from a donor or partner, and the embryo is frozen. The religious and ethical concerns and legislative restrictions surrounding embryo cryopreservation has prompted significant technical advances in oocyte cryopreservation techniques. Oocyte cryopreservation is now considered a well-established technique for fertility preservation in women.

Ovarian tissue cryopreservation
Cryopreservation of human ovarian tissue has been successfully carried out around the world to preserve fertility in female cancer patients and in other pathologies where the patient is at increased risk of primary ovarian insufficiency. Most notably, this technique can provide an option for fertility preservation in prepubertal girls. Part of the ovary is removed, frozen and stored until after treatment. The tissue is then thawed and re-implanted. According to a meta-analysis performed in 2017, the success rate of reestablishment of ovarian activity was 63.9%, restoring normal fertility and endocrine function. Over 130 live births have been reported as of June 2017.