Risk factor for recurrence of nasopharyngeal cancer.

The nasopharyngeal carcinoma is the common disease in Thailand. Following the initial treatment, because of the locally advanced disease, there are some recurrences The purpose of the study was to determine the risk factors for the recurrence of nasopharyngeal carcinoma. We found that the undifferentiated carcinoma, microscopic residual disease and mild radiation reaction of the normal tissue were the risk factors for local recurrence (35.71%, 80% and 33.33%, respectively). Comparing with the squamous cell carcinoma, poorly diferentiated, no residual disease and marked radiation reaction of the normal tissue, which had lower incidence of local recurrence (7.69%, 25% and 25%, respectively).