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了解一个地区恶性肿瘤的发病趋势,对制订肿瘤防治规划,评价防治效果和探索恶性肿瘤发病的危险因素,是十分重要的。我国幅员广大,各地社会经济发展水平不一,环境条件也有很大差异,恶性肿瘤的发病趋势各地无疑不会相同。目前,我国只有极少数地区,主要是北京,天津、上海大城市及少数几个肿瘤高发地区,积累了有较长时期的全人群恶性肿瘤
Understanding the trend of the onset of malignant tumors in an area is very important for the development of a cancer prevention plan, the evaluation of prevention and control effects, and the exploration of the risk factors for the onset of malignant tumors. China has a vast area with varying socio-economic development levels and environmental conditions. There is no doubt that the incidence of malignant tumors will not be the same everywhere. At present, there are only a few regions in China, mainly Beijing, Tianjin, Shanghai, and a few high-incidence areas, which have accumulated long-term malignancy in the whole population.