CRABP2 and cancer: The correlation between CRABP2 and FABP5 has been found in many cancer types: the mRNA and protein levels of CRABP2 and FABP5 in bladder cancer tissues (BC) are significantly higher than those in adjacent nontumor tissues, suggesting that the expression of CRABP2 and FABP5 in BC tissues is upregulated and they may become new biomarkers of BC [17].