Collaborative Group on Hormonal Factors in Breast Cancer

The Collaborative Group on Hormonal Factors in Breast Cancer (CGHFBC) is a group of scientific researchers who conduct meta-analyses of the worldwide epidemiological evidence on risk factors for breast cancer in women. It formed in 1992.[1] Their earliest publications were a 1996 meta-analysis of 54 studies on hormonal birth control and breast cancer risk[2] and a 1997 meta-analysis of 51 studies on menopausal hormone therapy and breast cancer risk.[3] One of their recent publications was a 2019 meta-analysis of menopausal hormone therapy and breast cancer risk based on type and timing of therapy.[1] In 2012, the group determined in a meta-analysis of 117 studies that the incidence of breast cancer was increased by each year younger at menarche and each year older at menopause.[4]

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