Previous studies have observed a correlation between the expression of CAFs and CRABP2 in pancreatic ductal adenocarcinoma (PDAC), where the two transporters of ATRA, fatty acid binding protein 5 (FABP5) and CRABP2, always appear in a high FABP5: CRABP2 ratio in quiescent fibroblasts. This evidence concerns the gene FABP5 and pancreatic ductal adenocarcinoma.