Efficacy of immunotherapy in gastrointestinal (GI) tumors with mismatch repair deficient (MMRd) unusual phenotype: an AGEO real-world study
Background
Tumors with mismatch repair deficiency (MMRd) classically display concomitant loss of MLH1/PMS2 or MSH2/MSH6 on immunohistochemistry (IHC) with microsatellite instability-high (MSI-High) status on molecular testing. Nevertheless, a differen…