CLCA4 and colorectal carcinoma: Based on the GEPIA database to test the relative expression of KGs mRNA, it was determined that our proposed KGs (CXCL8, CEMIP, MMP7, CA4, ADH1C, GUCA2A, GUCA2B, ZG16, CLCA4, MS4A12 and CLDN1) may be closely related to the occurrence and development of CRC (Fig. 5).