ERBB2 and neoplasm: The analyses results indicated that RAI2 expression was negatively related to tumor purity of BRCA (r = -0.136, p < 0.001), BRCA-basal (r = -0.401, p < 0.001), BRCA-HER2 (r = -0.136, p < 0.001) and BRCA-luminal (r = -0.261, p < 0.001) subtypes.