It's not just about the tatas.

"Wearing a long, black Saint Laurent gown that criss-crossed at the chest and featured a sheer panel across her midriff, [Angelina Jolie] smiled and waved to fans."

"She said her decision was informed by her mother's long fight and eventual death from breast cancer at 56."

Jolie's mother died of ovarian cancer.

People with the BRCA-1 or BRCA-2 gene mutation are at risk for several cancers:

A woman’s lifetime risk of developing breast and/or ovarian cancer is greatly increased if she inherits a harmful mutation in BRCA1 or BRCA2. Such a woman has an increased risk of developing breast and/or ovarian cancer at an early age (before menopause) and often has multiple, close family members who have been diagnosed with these diseases. Harmful BRCA1 mutations may also increase a woman’s risk of developing cervical, uterine, pancreatic, and colon cancer [ ]. Harmful BRCA2 mutations may additionally increase the risk of pancreatic cancer, stomach cancer, gallbladder and bile duct cancer, and melanoma [ ].

Men with harmful BRCA1 mutations also have an increased risk of breast cancer and, possibly, of pancreatic cancer, testicular cancer, and early-onset prostate cancer. However, male breast cancer, pancreatic cancer, and prostate cancer appear to be more strongly associated with BRCA2 gene mutations [ ].