I made a decision to have a preventive double mastectomy. I started with the breasts, as my risk of breast cancer is higher than my risk of ovarian cancer, and the surgery is more complex.

Breast cancer alone kills some 458,000 people each year, according to the World Health Organization, mainly in low- and middle-income countries. It has got to be a priority to ensure that more women can access gene testing and lifesaving preventive treatment, whatever their means and background, wherever they live.

I was diagnosed with breast cancer in 2004.

Every woman needs to know the facts. And the fact is, when it comes to breast cancer, every woman is at risk.

Breast cancer is thought to use cholesterol to help the cancer migrate and invade more tissue.

Still, it makes sense that something in the air might increase the risk of lung cancer because our lungs are just big filters.