[Report of a lung cancer survey in Hunan realgar miners].

A mass survey and follow-up examinations to screen lung cancer victims at hunan realgar mine have been carried out over three years. The checking methods include physical examinations sputum cytological screening and chest radiography. The incidence of lung cancer in those with moderate or severe broncho-epithelial hyperplasia found in sputum counts for 10.8%, which is much higher than that of the other cases, counting for 1.4% (P less than 0.05). Most of the victims belong to AJCC stage 1. When the check-up was done annually, nineteen cases of lung cancer were detected by chest radiography alone as compared with 11 cases by sputum cytological examination. In those X-ray positive cases three of them were failed to be detected in initial X-ray investigation.