[Second primary malignant tumor in patients with nasopharyngeal cancer].

Clinical analysis of 90 patients with malignant nasopharyngeal tumors treated in 1985-1996 was performed. The real frequency of second tumors, immunity to second malignant tumor, therapy and genetical factors were described. Second malignant nasopharyngeal tumors occur rarely than in other head and neck tumors (in our material approx. 4%). An attention should be paid to the young age of our patients, mean 46 years.