RETROSPECTIVE ANALYSIS OF PATIENTS WITH NASOPHARYNGEAL CARCINOMA TREATED DURING 1976-1985 - SURVIVAL AFTER LOCAL RECURRENCE

Purpose: To study the value of re-irradiation, the overall survival and pattern of failures for patients with nasopharyngeal recurrence. Methods and Materials: All the 891 patients with local recurrence following radiotherapy for nasopharyngeal carcinoma during 1976-1981 were retrospectively analyzed. Only 70% of them had local failure alone at the time of detection, and the T-stage distribution (by Ho's system) was 31 % rT1, 16% rT2, 51% rT3, and 1% rT?. Seven hundred and six (79%) patients had been reirradiated with various techniques and doses. Among those who failed, 50 had further irradiation. Results: The overall 5- and 10-year actuarial cancer-specific survival rates were 14% and 9%, respectively. Patients with rT3 disease had the worst prognosis. Successful local salvage was achieved in 32% of those re-irradiated (26% of the whole series). The highest control rate was achieved by those treated with external radiotherapy to 60 Gy (equivalent) or above. Only 8/50 patients responded to the third course of radiotherapy. The cumulative incidence of late post-reirradiation sequelae was 24%, and the treatment mortality rate 1.8%. Besides local failure, 54% had regional relapse and/or distant metastasis. Thus, only 16% of recurrent patients were totally disease-free at final assessment. Conclusion: The overall prognosis for patients with nasopharyngeal recurrence was grave. High dose re-irradiation could achieve successful local salvage in a substantial number of patients with early recurrence, but late complications did occur. Furthermore, high incidence of failure at other sites was observed.