[AgNORs staining of exfoliated cells in the nasopharynx for diagnosis of nasopharyngeal cancer].

AgNORs were investigated in exfoliated cell smears from nasopharynx and in sections of biopsied tissues of NPC patients. It showed increased tendency of AgNOR activity that was significantly higher in carcinomas than in benign tumors, chronic nasopharyngitis, and normal nasopharyngeal tissues. This suggests that AgNOR technique of exfoliated cells might be useful for NPC diagnosis, follow-up of NPC patients, and identification of precancerous lesions of the nasopharynx.