
To identify the tumor factors of in‐field failure for nasopharyngeal carcinoma (NPC) in the intensity‐modulated radiotherapy (IMRT) era. Patterns of recurrence were classified as in‐field, marginal, and out‐field failures. Multivariate analyses with the Cox proportional hazards model, were used to identify tumor‐related factors of in‐field failure. In‐field failure was the primary pattern of recurrence in patients with NPC. Large tumor volume, NKDC, and CNN were the tumor factors associated with in‐field failure.
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