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Valentina Davidovna Suntzeff, (born February 28, 1917) is a Russian-born American cancer researcher, known for her contributions in the studies of the cytology of cancer cells, and the link between tobacco smoking and cancer. She was a Research Associate Professor in the Washington University School of Medicine in St. Louis, Missouri.

She was born in Kazan, Russia, the daughter of a medical doctor. She entered the Women's Medical Institute of Petrograd in 1911 and graduated in 1917. She and her husband Alexander Suntzeff moved to Perm, Russia where she was in charge of a Zemstvo hospital. In 1918, her husband Alexander and Valentina were mobilized into the White Army of Admiral Alexander Kolchak, and fled east for two months to Irkutsk, along with the family of her husband. She was the medical officer on one of the evacuation trains. After the execution of Kolchak, the family fled to Chita, Russia and then Harbin, China arriving in 1920. In 1923, Alexander, Valentina, and their daughter Ludmilla immigrated to San Francisco. Not able to find work in their fields, they moved to Ferguson, Missouri where Valentina joined the research group of Dr. Leo Loeb in the Department of Pathology at the Washington University School of Medicine where she worked on the relationship between endocrine glands and development of mammary gland cancer. In 1941 she moved to the Department of Anatomy where she stayed for the rest of her professional career until 1971, retiring as a Research Associate Professor. Her main collaborators were Dr. Christopher Carruthers and Dr. Dr. Edmund V. Cowdry.