WHO Says So

"The World Health Organization (WHO) has concluded that hormone replacement therapy, taken by millions of women around the world, causes cancer, but said that does not mean women should automatically stop taking the treatment.

The International Agency for Research on Cancer declared that, based on consistent evidence emerging from studies over the last few years, it has reclassified hormonal menopause therapy from "possibly carcinogenic to humans," to "carcinogenic to humans." Studies have convincingly shown that the treatment slightly increases the risk of breast and endometrial cancers, the agency determined. It also concluded that the combined contraceptive pill causes more types of cancer than previously thought".

Article excerpt from BBC News