We found that the cancer subtype markers (GRP, CHGB, NEUROD1, and CHGA for NET; KRT5, DSC3, KRT6B, TP63, and KRT6A for SCC; and NKX2-1, KRT7, NAPSA, and MUC1 for ADC) were specifically expressed in the corresponding cancer subtypes. This evidence concerns the gene NKX2-1 and cancer.