Gastric cancer: Shanghai, Jiangsu, Gansu, Qinghai, Liaoning, Shandong, Jiangsu, Fujian and other provinces and cities. Investigating the high incidence of gastric cancer in real areas has a great relationship with the eating habits of local residents. Lung cancer: The high incidence areas are Northeast China and Yunnan. Beijing, Shanghai and Shenyang are the cities with the highest incidence of lung cancer in China. Lung cancer is the most common male tumor in Shanghai.