GSTM1 and nasopharyngeal carcinoma: <h4>Purpose</h4>To evaluate the predictive potency of a novel index combining the pan-immune-inflammatory index and hemoglobin levels (PIV/Hb) for the prevalence of radiation-induced trismus (RIT) in patients with locally advanced nasopharyngeal cancer (LA-NPC) receiving concurrent chemoradiotherapy (CCRT).<h4>Methods</h4>Data from 228 LA-NPC patients were retrospectively examined.