RBP4 and hepatocellular carcinoma: The key genes (FABP1, ALB, FGB, APOH, RBP4, FGG, and AHSG) reportedly always showed up (Figure S8C, Supporting Information) among HCC CTCs in independent studies from three research groups.[12, 13, 14] A more directed signature of hepatocytes was also detected as an indicator (Figure S8D, Supporting Information).