国家癌症中心收到各肿瘤登记处上报资料后，首先检查资料的完整性。在确认资料完整后，使用IARC/IACR工具软件中的Check程序逐一检查所有记录的变量是否完整和有效，同时对不同变量之间是否合乎逻辑的一致性进行检查。然后使用数据分析软件及数据库软件生成统一表格，对登记数据的完整性和可靠性做出评估。各登记地区根据评估结果，对登记资料进行核实、补充与修改，将修改后的资料再次上报国家癌症中心，国家癌症中心将全国各登记地区数据进行汇总分析，并撰写年度报告（图2-2）。

5　Flow diagram of data quality

After receiving the cancer registration data，NCC will first check the completeness of the cancer data.After that，IARC/IACR-check software would be used to check whether all the variables are complete and valid.The internal consistency of the dataset would also be checked.NCC would further publish specific data evaluation report to each registry.The local registries would follow the evaluation report to check and revise the cancer datasets once again.Qualified cancer dataset will be pooled and analyzed for annual national cancer report（Figure 2-2）.