Study on the Effectiveness and Safety of the Combination of the Two Drugs Regorafenib and Nivolumab in Patients With Colorectal Cancer (Cancer of the Colon or Rectum Classified as Proficient Mismatch Repair and Microsatellite Stable)

Inclusion Criteria: * Histological or cytological confirmed advanced, metastatic, or progressive pMMR/MSS adenocarcinoma of colon or rectum * Participant must have progressed or be intolerant to prior systemic chemotherapy including fluoropyrimidines, irinotecan, oxaliplatin, anti-vascular endothelial growth factor (VEGF) therapy, and, if extended rat sarcoma viral oncogene homolog (RAS) wild type, an anti-epidermal growth factor receptor (EGFR) therapy. Exceptions may apply * Participants must have adequate organ and marrow function defined by protocol-specified laboratory tests * Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1 * Measurable disease as determined by response evaluation criteria in solid tumors (RECIST) v1.1 * Provision of recently obtained tumor tissue as per protocol specified requirement * Anticipated life expectancy greater than 3 months * Be able to swallow and absorb oral tablets Exclusion Criteria: * Participants with Mismatch repair deficient (dMMR) / microsatellite instable-high (MSI-H) colorectal cancer * Prior therapy with regorafenib, anti-programmed cell death protein 1 (PD-1), programmed cell death protein 1 ligand 1 (PD-L1), or cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) inhibitors, or any form of immunotherapy to treat cancer * Presence of active central nervous system (CNS) metastases; participants with stable CNS disease or previously treated lesions are eligible for study entry * Poorly controlled hypertens…