Inter-quartile after normalization on the reference gene set. cP for Spearman rank correlation test. dP for Mann-Whitney U test. eP for Kruskal-Wallis test, including a Wilcoxon-type test for trend when appropriate. fWith quantitative polymerase chain reaction cut point for positive versus negative ESR1 and PGR, 0.2 and 0.1, respectively, and for ESR2 at the median level of 0.005 (mRNA levels rela