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Rare ATM gene mutations, plus radiation, may increase risk of a second breast cancer

Cancer • • Breast CancerMar 19, 10

Certain rare mutations in the ataxia telangiectasia mutated (ATM) gene, combined with radiation exposure, may increase a woman’s risk of developing a second cancer in the opposite breast, according to a study published online March 19 in the Journal of the National Cancer Institute.

Breast cancer survivors are at increased risk of developing a second cancer in the other, or contralateral breast, compared to women who have not had Breast cancer. The ATM gene is known to play a role in cells’ response to DNA damage caused by ionizing radiation, another Breast cancer risk factor. But it has been unclear whether women who carry ATM mutations are especially susceptible to radiation-induced Breast cancer.

To address this issue, Jonine Bernstein, M.D., of the Memorial Sloan-Kettering Cancer Center in New York, and colleagues, compared ATM mutations among women who had developed a second cancer in the contralateral breast to mutations in those who had a cancer in only one breast. The women were participants in the Women’s Environment, Cancer, and Radiation Epidemiology (WECARE) Study, an international case–control study. There were 708 case subjects—women with contralateral cancer—and 1,397 control subjects who did not have a second cancer but were similar to the case subjects in other respects, such as age and race. 

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An ectopic pregnancy occurs when a fertilized egg implants outside of the uterus. The most common site is within a fallopian tube. More rarely an embryo may implant within an ovary, in the cervix, or on the abdominal wall
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