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胃癌和子宫癌的死亡率确实低,肺癌的粗死亡率和修正死亡率却明显增加。肺是最容易受环境支配的脏器,肺癌增加的原因有:吸烟,大气污染物,职业性致癌物质(铬、石棉)。以上是肺癌增加的三大因素。还有动物性蛋白、脂肪摄入增加,肺内各种病变的存在,性激素、维生素等诱因。再者肺癌在临床上早期发现是困难的,加上早期转移的病例,5年以上生存率低。1950年的肺癌修正死亡率男性1.9,女性0.8,约占胃癌的1/20,而现在肺癌男性18.6、女性6.1,是胃癌的2/3,不久将继续增加而超过胃癌跃居第一位。一、吸烟与肺癌的问题
The mortality rate of gastric cancer and uterine cancer is indeed low, but the crude mortality and the revised mortality rate of lung cancer are obviously increased. Lung is the most easily affected by the environment organs, lung cancer increased because: smoking, air pollutants, occupational carcinogens (chromium, asbestos). These are the three major factors that increase lung cancer. There are animal protein, increased fat intake, the existence of various lung diseases, sex hormones, vitamins and other incentives. Furthermore, early detection of lung cancer in clinical is difficult, combined with early cases of metastasis, 5-year survival rate is low. The revised 1950 lung cancer death rate was 1.9 for males and 0.8 for females, accounting for 1/20 of gastric cancers. However, nowadays, lung cancer is 18.6% females and 6.1% females are 2/3 of gastric cancers and will soon continue to surpass gastric cancer. First, the problem of smoking and lung cancer