ERBB2 and neoplasm: After adjustment for these convariates, methylated-PTPRO was identified as an independent predictor for overall survival in all tumor group (hazard ratio (HR): 2.7; 95% CI: 1.1-6.2; P = 0.023) and HER2+ subpopulation (hazard ratio (HR): 7.5; 95% CI: 1.8-31.3; P = 0.006), but not in ER + and PR + subpopulation.