Introduction Cancer is a major world problem. According to the World Health Organizatlon, people with cancer number approximately 14 million. About 7 million new cases are diagnosed each year, half in developing count...Introduction Cancer is a major world problem. According to the World Health Organizatlon, people with cancer number approximately 14 million. About 7 million new cases are diagnosed each year, half in developing countries. These are conservative estimates, based largely on reported cases. In developing countries which account for a large part of the world's population,展开更多
文摘Introduction Cancer is a major world problem. According to the World Health Organizatlon, people with cancer number approximately 14 million. About 7 million new cases are diagnosed each year, half in developing countries. These are conservative estimates, based largely on reported cases. In developing countries which account for a large part of the world's population,