ESR1 and breast cancer: The associations between testosterone and ER+/PR+/AR+ and ER+/PR+ breast cancer risk, among the subset of women with AR data, were similar (among women with AR data: ER+/PR+ ORlog2: 1.32; ER+/PR+/AR+ ORlog2: 1.36), suggesting the AR may not play an important role in this context.