Abstract:【Abstract】 Objective To identify changes in patterns of primary bronchogenic carcinoma. Methods We reviewed clinical data of patients with primary bronchogenic carcinoma, who were identified as permanent residents of Sichuan province and were treated in West China Hospital of Sichuan University in 2000 and 2010. The distributions of gender, age, urban/rural residency, smoking history, occupational exposure and histological types of tumor were compared between the 2000 group and 2010 group. Results A total of 2 167 patients (616 in 2000 and 1551 in 2010) met the inclusion criteria. Compared with the 2000 group, the 2010 group had a lower proportion of male patients (male/female sex ratio dropped from 2.78∶1 to 2.13∶1, P=0.013), more patients from medium and small sized cities (patients from large city decreased from 42.1% to 32.0%, PPP=0.041, and patients from villages increased from 12.5% to 28.2%, PPPP
