in short: Tamoxifen offered to prevent Breast Cancer

Thousands of women across Britain with a family history of breast cancer are to be offered drugs on the NHS to help prevent the disease.
The National Institute for Health and Care Excellence says tamoxifen or raloxifene taken daily for five years can cut breast cancer risk by 40%. - bbc

I'm always sceptical when significant solutions are offered free, or at little cost, within a system based on power and greed.  Contradictory behaviour generally signals an agenda.