e 20th century, may play a role in developing a second cancer in organs close to the breast. An increased risk of myeloid leukemia was also shown, possibly as a result of chemotherapy. In addition, while previous studies had shown an increased risk of endometrial cancer with the use of tamoxifen, the current study suggests that this may not be entirely due to the drug, since the increased risk was already shown within one year of breast cancer diagnosis, it was shown before 1975 when tamoxifen was rarely used, and an increased risk of breast cancer was also seen after endometrial cancer. Colorectal, kidney and postmenopausal breast cancer appear to share obesity as a risk factor, while ovarian cancer and breast cancer seem to have a genetic predisposition in common. The study found an excess of ovarian cancer already within one year of breast cancer diagnosis, along with an increased risk of breast cancer after ovarian cancer.

"The overall impression from this very large study is that a breast cancer diagnosis has an effect on subsequent cancer risk in general, since so many cancer sites were seen to occur in excess of what was expected," the authors conclude. "The known effects of treatment and common risk factors do not seem to fully explain the excesses."

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Contact: David Greenberg
dgreenbe@wiley.com
201-748-6484
John Wiley & Sons, Inc.
8-Dec-2005

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