"Thymalfasin Immunotherapy Study with Triple Regimen in Advanced MSS/pMMR Colorectal Cancer"

Thymalfasin: 4.8 mg, administered subcutaneously twice weekly.

Regorafenib: Start at 80 mg once daily, orally, taken at a fixed time for 2 consecutive weeks and then stopped for 1 week. If the patient tolerates it well, increase to 120 mg/d in Cycle 2.

Tislelizumab: 200 mg, iv.gtt, single infusion, 21 days as a cycle, Day 1.