After immunohistochemical staining of the cancer tissue sections, it was observed under microscope that FABP4 and FABP6 were brown after staining, the positive sites were mainly distributed in cytoplasm of cells from human colorectal tumor tissues (FABP4: Fig. 2b, FABP6: Fig. 2d), and only a small amount was distributed in adjacent tissues (FABP4: Fig. 2a, FABP6: Fig. 2c). Here, FABP4 is linked to cancer.