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Background: No evidence is currently available to estimate the outcomes of intensity-modulated radiation therapy (IMRT) and surgery for patients with early oral cavity squamous cell carcinoma (E-OCSCC). Methods: We recruited patients from the Taiwan Cancer Registry Database who had received a diagnosis of E-OCSCC. Propensity score matching was performed, and Cox proportional hazards model was used to analyze all-cause mortality. Results: In the multivariate Cox regression analyses, the adjusted hazard ratio

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