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Background  To compare the radiation-induced temporal lobe injury (TLI) in patients with nasopharyngeal carcinoma (NPC) treated with intensity-modulated radiotherapy (IMRT) or two-dimensional conventional radiotherapy (2D-CRT).    Patients and Methods  1276 cases of NPC treated with IMRT or 2D-CRT were retrospectively reviewed. A diagnosis of TLI was made on follow-up magnetic resonance imaging (MRI).    Results  The crude incidence of TLI was 7.5% and 10.8% ( P  = 0.048), and the actuarial 5-year incidence was 16% and 34.9% ( P <0.001) for the IMRT and 2D-CRT groups, respectively. Multivariate analysis revealed both T stage ( P <0.001) and radiation technique ( P <0.001) as independent predictors. Patients with T1, T2 and T3 disease had a significantly higher risk when treated with 2D-CRT ( P  = 0.005, 0.016, <0.001, respectively). This trend was not evident for T4 patients ( P  = 0.680). The 2D-CRT group had a longer latency for the development of TLI ( P <0.001). Those with T4 disease had a shorter median time to TLI ( P  = 0.006, 0.042, <0.001 when compared with T1, T2 and T3, respectively).    Conclusions  IMRT is superior to 2DRT for the management of T1-T3 NPC in terms of sparing the temporal lobe. The high incidence of TLI in T4 disease needs to be addressed.

plos one

Radiation-Induced Temporal Lobe Injury for Nasopharyngeal Carcinoma: A Comparison of Intensity-Modulated Radiotherapy and Conventional Two-Dimensional Radiotherapy