An allele known as BRCA1 is often found in women with breast and ovarian cancer. However, some women develop these cancers and do not have the BRCA1 allele. In addition, some women who have BRCA1 never develop breast or ovarian cancer. How can this be explained?

Question

Quizplus · Accepted Answer

While having the BRCA1 allele is associated with an increased risk for breast and ovarian cancer, it is not a guarantee that the cancer will develop. Other factors, such as lifestyle and environmental factors, can also play a role. Similarly, not having the BRCA1 allele does not necessarily mean that a woman will not develop breast or ovarian cancer.

An Allele Known as BRCA1 Is Often Found in Women