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The prognostic value of diabetes remains unknown in nasopharyngeal carcinoma (NPC) treated with intensity-modulated radiation therapy (IMRT). We retrospectively reviewed medical records of 1489 patients with non-metastatic, histologically-proven NPC treated using IMRT. 81/1489 (5.4%) patients were diabetic, 168/1489 (11.3%) were prediabetic, and 1240/1489 (83.3%) were normoglycemic. The 4-year disease-free survival (DFS), overall survival (OS), loco-regional relapse-free survival (LRRFS) and distant metastasis-free survival (DMFS) rates were 77.1% vs. 82.4% ( P  =  0.358 ), 85.8% vs. 91.0% ( P  = 0.123), 90.9% vs. 91.7% ( P  = 0.884), and 85.5% vs. 89.2% ( P  = 0.445) for diabetic vs. normoglycemic patients, and 82.4% vs. 82.4% ( P  = 0.993), 88.7% vs. 91.0% ( P  = 0.285), 90.6% vs. 91.7% ( P  = 0.832) and 91.5% vs. 89.2% ( P  = 0.594) for preidabetic vs. normoglycemic patients. Multivariate analysis did not established diabetes as poor prognostic factors in NPC patients treated with IMRT ( P  = 0.332 for DFS,  P  = 0.944 for OS,  P  = 0.977 for LRRFS,  P  = 0.157 for DMFS), however, triglycerides and low density lipoprotein cholesterol were independent prognostic factors. In conclusion, diabetes does not appear to be a prognostic factor in NPC patients treated with IMRT, and attention should be paid to hyperglycemia-associated hyperlipaemia.

Prognostic value of Diabetes in Patients with Nasopharyngeal Carcinoma Treated with Intensity-Modulated Radiation Therapy