ERBB2 and breast cancer: Luminal A/B breast cancer patients have higher PTPRT expression level than that in adjacent normal breast cancer tissues (5.21 vs. 4.41, p < 0.001), while HER2+ (median 0.16 vs. 4.41, p < 0.001) and TNBC (median 0.09 vs. 4.41, p < 0.001) patients have lower PTPRT expression than that in adjacent normal breast cancer tissues (Figure 1).