Plasma prolactin and postmenopausal breast cancer risk: a pooled analysis of four prospective cohort studies.

In the analysis of molecular subtypes, although the association appeared stronger for the subset of women diagnosed with triple-negative breast cancer, the test for heterogeneity did not reach statistical significance (quartile 4 vs. quartile 1, Luminal A OR: 1.15, 95% CI: 0.97, 1.36, P-trend = 0.04; Luminal B, OR: 1.11, 95% CI: 0.80, 1.54, P-trend = 0.39; Triple-Negative OR: 1.54, 95% CI: 1.04, 2.27, P-trend = 0.04; P-heterogeneity = 0.38) (Supplemental Fig. 7).

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