FABP5 and neoplasm: (4) CRABP2/FABP5 is related to ethnicity (p = 0.001), nerve invasion (p = 0.031), and chemoradiotherapy (p = 0.038), and the low ratio of CRABP2 and FABP5 boosts differentiation of tumor, indicating that CRABP2/FABP5 affected the progress of ESCC.