ESR1 and breast neoplasm: In the ERα+ breast tumor profile dataset from van de Vijver et al. [14], PGR was correlated with both ERα (Pearson's correlation p < 0.01) and age-corrected ERα (p = 0.05), and over half of the 674 genes most correlated (p < 0.05) with PGR overlapped with the set of 1,338 genes most correlated (p < 0.05) with age-corrected ERα (enrichment p ~ 0).