Besides, we also explored the correlation of ERBB2 expression and the pathological stages of PAAD and UCEC, which are cancer types with ERBB2 gene gain-of-function, or KICH and KIRH, which are other cancer types with ERBB2 gene loss-of-function, according to the “Pathological Stage Plot” module of GEPIA2 (Figure 1E). Here, ERBB2 is linked to pancreatic adenocarcinoma.