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IQGAP1 is a conserved multifunctional protein implicated in tumorigenesis.An aberrant expression of IQGAP1 widely exists in many cancers,but the SUMOylation modification of IQGAP1 in carcinogenesis is unknown by now.Here we first time explore biological functions of IQGAP1 SUMOylation in promoting colorectal cancer progression in vitro and in vivo.