CKS1 is highly expressed in colon cancer tissues, and the overexpression of CKS1 promotes cell proliferationand colony formation in both HCT116 (originating from primary colon cancer) and SW620 (originating from metastatictumor nodules of colon cancer) cells. CKS1-expressing HCT116 cells produced larger tumors than the controlcells. The expression pattern of PADI3 and CKS1 are negatively correlation in clinical samples of colon cancer, furtherstudy indicates that PADI3 can significantly decrease Hsp90 and CKS1 expression, and Hsp90 is essential for PADI3 todownregulate CKS1expression in colon cancer cells.