MICA and cholangiocarcinoma: The expression levels of MICA and MICB in cholangiocarcinoma (CHOL), colorectal cancer (COAD), hepatocellular carcinoma (LIHC), and gastric cancer (STAD) were significantly higher than those in the corresponding normal tissues, while there was no statistically significant difference in the expression level in pancreatic cancer (PAAD) compared with normal pancreatic tissues (Figure 1A,B).