There is also a questionable status of MUC7 expression in BRCA, in which most histological subtypes appear to have some specimens without MUC7 expression after normalization; however, triple negative breast cancer and low sample size confounds the analysis of MUC7 in BRCA (Supplementary Table 1 and S3, Supplementary Figure 3). Here, MUC7 is linked to triple-negative breast carcinoma.