Definitely, yes. About 10% of breast cancers occur due to familial cancer. About 5 % of family members undergo a tumor suppress surgery (BRCA 1 or BRCA 2) where the higher chances of developing breast cancer would range from 60 - 80%. Moreover, 40 – 50% of women develop Ovarian cancer due to the genes that are mutated causing a higher incidence of breast cancer. The important thing can be familial or can be acquired also and that can be detected with a simple blood test.  In the olden days, it was very costly In America it required about 1000 dollars (i.e) Rs.75000. But in India, we can do the genetic testing for the BRCA mutation test just for 20000 rupees. It is an important method of diagnosing familial cancer.