根据W H O2000年的报告,全球每年癌症死亡人数已经超过700万大关,占全部死亡人数的12%。在发展中国家这个比例是9%,发达国家是21%。我国虽然是发展中国家,但总体来说癌症占居民死亡原因的19%,已经接近发达国家。而在北京和上海甚至达到24%和26%,也就是说,在这两大城市,每四个死 According to the report of WH O2000, the annual number of cancer deaths worldwide has exceeded 7 million, accounting for 12% of all deaths. In developing countries, this proportion is 9%, and developed countries are 21%. Although China is a developing country, cancer, on the whole, accounts for 19% of the death causes of residents, and it is already close to developed countries. And in Beijing and Shanghai, even 24% and 26%, that is, in these two major cities, every four die