Pfizer Hormones Almost Double Breast Cancer Death Risk in Study

Pfizer Inc.’s Prempro, a hormone once used by millions of women to ease menopause symptoms, almost doubled the death risk from breast cancer, a U.S. study found.

The findings from the U.S.-funded Women’s Health Initiative are the first to tie Pfizer’s hormone replacement therapy Prempro, already linked to higher breast cancer and heart disease rates, to increased mortality from tumors.