Final results of ANICCA-Class II, a single arm, open-label phase II trial assessing nivolumab in tissue-specific class II expressing metastatic microsatellite stable colorectal cancer, with a parallel assessment of the immunoscore-immune checkpoint as a predictive biomarker for single-agent anti-PD-1.

ABSTRACT:

Background

Neutralization of interferon (IFN)-γ abrogates the efficacy of anti-programmed death-ligand 1 (PD-(L)1) checkpoint inhibitors. Most epithelial cells do not constitutively express major histocompatibility complex (MHC) class II but can be induced to do so by IFN-γ. Inducible tumor-specific MHC class II (tsMHC-II) underlies responsiveness to anti-PD-(L)1. Retrospective studies show that tsMHC-II positivity associates with improved outcomes in patients treated with anti-PD-(L)1. The ANICCA-Class II single-arm Bayesian phase II trial prospectively explored whether positive tsMHC-II status could be a useful selection marker for anti-programmed cell death protein-1 (PD-1) in proficient mismatch repair colorectal cancer (pMMR CRC). In parallel, we retrospectively evaluated the

SUBMITTER: Middleton G 

PROVIDER: S-EPMC12716601 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature