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This study aimed to determine the predictive value of a unique combination of hemoglobin-to-platelet ratio (HPR) and maximum mouth opening (MMO) for radiation-induced trismus (RIT) in patients with locally advanced nasopharyngeal carcinoma (LA-NPC). The data of 198 patients were analyzed retrospectively, and four groups were formed based on HPR and MMO cutoff values. The RIT rates for these groups were 10.2%, 15.2%, 25%, and 59.4%, respectively. Groups 2 and 3 were merged to create the HPR-MMO index, which classified patients into low-risk (HPR > 0.54 and MMO > 40.7 mm), intermediate-risk (HPR ≤ 0.54 but MMO > 40.7 mm or HPR > 0.54 but MMO ≤ 40.7 mm), and high-risk (HPR ≤ 0.54 and MMO ≤ 40.7 mm) groups, with RIT rates of 10.2%, 19.2%, and 59.4% respectively. The HPR-MMO index shows promise in classifying LA-NPC patients into different risk groups for RIT.
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