RBP4 and colorectal carcinoma: The serum RBP4 concentrations in male normal controls and male CRC patients are 42.1±10.5 μg/mL and 23.2±8.2 μg/mL, while in female normal controls and CRC patients are 29.6±8.3 μg/mL and 19.5±8.0 μg/mL, respectively.