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随着癌症防治研究工作的进展，癌症发病率的数据和资料越显重要，现将北京市城区1993年一1994年癌症发病率监测结果，与10年前的发病率资料进行比较，研究其癌症发病率变化趋势。一、材料与方法资料来源：北京市恶性肿瘤常规发病登记报告资料。对北京城区（东城、西城、崇文。
With the progress in research on cancer prevention and control, the data and data on the incidence of cancer are becoming more and more important. We now compare the monitoring results of the incidence of cancer in the urban area of Beijing in 1993-1994 with the data of the incidence rate 10 years ago to study its cancer. Incidence trends. I. Materials and methods Source: Beijing Municipality, routine registration report of malignant tumors. For Beijing City (Dongcheng, Xicheng, Chongwen.