Improved survival of patients with nasopharyngeal squamous cell carcinoma.

One hundred and one patients with nasopharyngeal squamous cell carcinoma (NPC) were treated with irradiation. The UICC TNM staging system (1978) was used: 6 patients were T1N0, 10 T2N0, 5 T3N0, 13 T4N0, 11 T1N+, 18 T2N+, 19 T3N+ and 19 T4N+. Since 1978, 34 patients were examined with computed tomography (CT) at first presentation. Fourteen (41%) of the 34 tumors were upstaged based on the CT findings alone. The technique of radiation therapy was markedly changed around 1978. The fields to the primary site and neck were enlarged. Two-year relapse-free survival was significantly better for the post-CT era than pre-CT era. This was mainly because of improved local-recurrence-free survival, and cervical-relapse-free survival. Improved local-recurrence-free survival, however, was appreciated in only T3 + T4 patients; there was no difference in T1 + T2 patients. It is suggested that merely enlarging radiation fields or increasing radiation doses could not be curative for some subpopulations. In order to increase local control rates further, we have started to use intracavitary irradiation with an after-loading technique as a boost. Preliminary results are encouraging.