RecruitingPhase 2ProcedureImmunotherapy (Toripalimab) for Reducing Recurrence Risk After Surgery for Mismatch Repair Deficient Stage IIB, IIC, or III Colon CancerThis phase II trial tests how well immunotherapy (toripalimab) works for reducing the risk of cancer recurrence after surgery in patients with mismatch repair deficient stage IIB, IIC, or III colon cancer.