ROBO1 and biliary tract neoplasm: ROBO1 was also expressed on the cell membrane in 37% of pharyngeal cancer, 14% of oral cancer, 6% of breast cancer, 38% of esophageal cancer, 52% of lung squamous cell carcinoma, 11% of lung adenocarcinoma, 21% of biliary tract cancer, 74% of hepatocellular carcinoma, 11% of renal cell carcinoma, 14% of uterine cancer, 67% of hepatoblastoma, 80% of nephroblastoma, 17% of germ cell tumor, 14% of neuroblastoma, and 10% of melanoma.