2Xia P, Fu KK, Wong GW, et al. Comparison of treatment plans involving intensity modulated radiotherapy for nasopha- ryngeal carcinoma. Int J Radiat Oncol Boil Phys, 2000,48 : 329-337.
4Lin JC,Jan JS, Hsu CY,et al. Phase Ⅲ study of concurrent chemoradiotherapy versus radiotherapy alone for advanced na- sopharyngeal carcinoma:postive effect on overall and progres- sion free survival. J Clin Oncol, 2003,21 : 631-637.
5Lee N,Xia P,Quivey .JM,et al. Intensity modulated radiother apy in the treatment of nasopharyngeal carcinoma : an update of the VCSF experience. Int J Radiat Oncol Biol Phys, 2007,53 : 12.