HOKI, K. Retrospective study of 94 cases pyriform sinus carcinoma. X, VI. World Congress of Otorhinolaryngology Head and Neck Surgery Proc, 1997. 1997, 255-259
MAMELLE, G. Lymph node prognostic factors in head and neck squamous cell carcinomas. Am J Surg. 1994, 168, 494-498
LEFEBVRE, JL. Larynx preservation in pyriform sinus cancer : preliminary results of a European organization for research and treatment of cancer phase III trial. J Natl Cancer Inst. 1996, 88, 890-899