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癌瘤是当前危害人类健康与生命的一种常见疾病。目前癌瘤死亡率一般约占人类总死亡率的四分之一左右。全世界每年死于癌症人数约300万人左右。一些国家,如英国、美国、法国、日本等,癌瘤的死亡率在各种死亡原因中居第二位,仅次于心血管疾病。例如美国一年中有20万以上的人死于癌症,占死亡总数的17％,并且每年以3％的数字向上增长。有些国家,如捷克、挪威等甚至超越了心血管疾病而占第一位。有些部位癌的死亡率增长更为明显,如美国肺癌死亡率近四十年来在男性增加十八倍,女性增加六倍,平均增加了将近十
Cancer is a common disease that currently harms human health and life. At present, the cancer mortality rate generally accounts for about one fourth of the total human mortality. About 3 million people die from cancer each year in the world. In some countries, such as the United Kingdom, the United States, France, and Japan, the cancer mortality rate ranks second in all causes of death, second only to cardiovascular disease. For example, in the United States, more than 200,000 people die of cancer each year, which accounts for 17% of the total deaths, and it increases by 3% every year. Some countries, such as the Czech Republic and Norway, have even surpassed cardiovascular disease to occupy the first place. Mortality increases in some sites are even more pronounced. For example, the mortality rate of lung cancer in the United States has increased 18 times in males and 6 times in females in the past 40 years, with an average increase of nearly ten.