Comparison of the treatment outcomes of intensity-modulated radiotherapy and two-dimensional conventional radiotherapy in nasopharyngeal carcinoma patients with parapharyngeal space extension

Compared to 2D-CRT, IMRT improved LRFS in patients with PPS extension, especially patients with CS extension, but did not improve DMFS. CS extension was not statistically prognostic for local control in NPC patients with PPS extension.