2Carlos AP, Luther WB. Cacinoma of the nasopharynx. In: Principles and practice of radiation oncology [ M]. 3th ed. Philadelphia;JB Lippincott, 1997:930 - 933.
3Yang TS, Ng KT, Wang HM, et al. Prognostic factors of locoregionally recurrent nasopharyngeal carcinoma a retrospective review of 182 cases [ J ]. Am J Clin Oncol, 1996,19:337 - 343.
4Lee AW, Law SC, Foo W, et al. Retrospective analysis of patients with nasopharyngeal carcinoma treated during 1976 - 1985 : survival after local recurrence[ J]. Int J Radiat Oncol Biol Phys, 1993,26:773 - 782.
5Lee AW, Poon YF, Foo W, et al. Retres pective analysis of 5037 patients with nasopharyngeal carcinoma treated during 1976 - 1985 : overall Survival and Patterns of failure[ J]. Int J Radiat Oncol Biol Phys, 1992,23: 261 - 270.
6Sanguineti G, Geara FB, Garden AS, et al. Carcinoma of nasopharynx treated by radiotherapy alone:determinants of local and regional control [J]. Int J Radiat Oncol Biol Phys,1997 ,37 :985 -996.
7Lee AW, Foo W, Law SC, et al. Reirradiation for recarrent nasopharyngeal carcinoma: factors affecting the therapeuctic ratio and ways for in- provement [ J]. Int J Radiat Oncol Biol Phys, 1997,38:43 -52,.
8Pryzant RM, Wendt CD, Delclos L, et al. Re-treatment of nasopharyngeal cacinoma in 53 patients [ J]. Int J Radiat Oncol Biol Phys, 1992,22: 941 - 947.