News | March 13, 2015

Family History of Prostate Cancer Could Increase Breast Cancer Risk

Study finds women with first-degree relatives with prostate cancer are at increased risk for developing breast cancer

breast cancer, prostate cancer, increased risk, first-degree relatives

March 13, 2015 — Having a family history of prostate cancer among first-degree relatives may increase a woman's risk of developing breast cancer. That is the conclusion of a new study published online in CANCER, a peer-reviewed journal of the American Cancer Society. The study's results indicate that clinicians should take a complete family history of all cancers — even those in family members of the opposite sex — to help assess a patient's risk of developing cancer.

Evidence suggests that the risk of developing breast and prostate cancer is increased among individuals with a family history of the same disease, particularly among first-degree relatives. However, less is known about the relationship between breast and prostate cancer within families.

To investigate, Jennifer L. Beebe-Dimmer, Ph.D., MPH, of the Barbara Ann Karmanos Cancer Institute and Wayne State University School of Medicine in Detroit, studied 78,171 women who enrolled in the Women's Health Initiative Observational Study between 1993 and 1998 and were free of breast cancer at the start of the study. During follow-up, which ended in 2009, a total of 3,506 breast cancer cases were diagnosed. The researchers found that a family history of prostate cancer in first-degree relatives (fathers, brothers and sons) was linked with a 14 percent increase in breast cancer risk for women, after adjusting for various patient factors. In separate analyses examining the joint impact of both cancers, a family history of both breast and prostate cancer was linked with a 78 percent increase in breast cancer risk. Risks associated with a family history of both breast and prostate cancer were higher among African American women than white women.

"The increase in breast cancer risk associated with having a positive family history of prostate cancer is modest; however, women with a family history of both breast and prostate cancer among first-degree relatives have an almost 2-fold increase in risk of breast cancer," said Beebe-Dimmer.

Beebe-Dimmer noted that patients and physicians may not consider certain cancer diagnoses among family members, especially those in members of the opposite sex, in their assessments of cancer risk. "These findings are important in that they can be used to support an approach by clinicians to collect a complete family history of all cancers — particularly among first degree relatives — in order to assess patient risk for developing cancer," she said. "Families with clustering of different tumors may be particularly important to study in order to discover new genetic mutations to explain this clustering."

For more information: www.karmanos.org

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