Breast cancer and hormone replacement therapy: collaborative reanalysis of data from 51 epidemiological studies of 52,705 women with breast cancer and 108,411 women without breast cancer. Collaborative Group on Hormonal Factors in Breast Cancer

This meta-analysis of 51 epidemiological studies involving 52,705 women with breast cancer and 108,411 without examined the link between hormone replacement therapy (HRT) and breast cancer risk. The findings showed that current HRT use increases breast cancer risk, with the risk rising with prolonged use but diminishing after cessation. The