ESR1 and neoplasm: Of the other markers, the strongest correlation results involve CD31 expression in tumour tissue, which is negatively correlated with the SHR markers in tumour, and, more particularly, the epithelial expression of AR (r_s = −0.54) and, to a lesser extent, the stromal expression of both ER (r_s = −0.41) and PR (r_s = −0.40).