No. A history of breast cancer in your mother's OR your father's family will influence your risk equally. The reason is that half of your genes come from your mother, and half from your father.
A man with a breast cancer gene abnormality is less likely to develop breast cancer than is a woman with a similar gene abnormality. Therefore, if you want to learn more about your father's family history of breast cancer and breast cancer gene abnormalities, you have to look mainly at the women on your father's side, not just the men.
For those women who have a family history of breast cancer, their risk may be elevated considerably, slightly, or not at all, compared to women without a family history of breast cancer. The nature of the family history is one of the factors determining the degree of risk. For example, if a woman has a first-degree female relative (mother, daughter, sister) who had breast cancer, the woman's risk of getting breast cancer is about twice as high as the risk in women lacking a first-degree female relative who had breast cancer.
If a woman is concerned about her family history of breast cancer, she should discuss it with her physician or a genetic counselor. She may be worrying needlessly.
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