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In the randomized Phase 2 trial, investigators studied the efficacy of combining the monoclonal antibody sintilimab with the histone deacetylase inhibitor chidamide (HDACi) with or without the monoclonal antibody bevacizumab in patients with chemotherapy-refractory unresectable colorectal cancer with stable/effective microsatellite mismatch repair (MSS/pMMR). A total of 48 patients were randomly assigned to either the doublet arm (sintilimab and chidamide, n = 23) or the triplet arm (sintilimab, chidamide and bevacizumab, n = 25). The primary endpoint, progression-free survival at 18 weeks, was achieved in 43.8% of patients. The triplet group showed significantly improved results compared with the doublet group.

Source(s) :
Feng Wang et al. Combined anti-PD-1, HDAC inhibitor and anti-VEGF for MSS/pMMR colorectal cancer: a randomized phase 2 trial. Nat Med. 2024 Mar 4. ;

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