Lung cancer ranks first in all regions except Tibet Autonomous Region, Gansu Province and Qinghai Province. Nasopharyngeal carcinoma ranks in the top 10 in Guangdong Province, Guangxi Zhuang Autonomous region, Hainan Province, Jiangxi Province and Guizhou Province.
Gastric cancer is closely related to Helicobacter pylori infection and dietary habits. Colorectal cancer is associated with excessive meat intake, obesity, and lack of exercise. Breast cancer and ovarian cancer are hormone-dependent tumors, and the incidence is higher in urban areas than in rural areas. The more humid areas with perennial rain, the higher the incidence of liver cancer.