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国立癌肿数据库（NCDB）是建立于美国全地区每年收集的资料，其中收集了1985～1993年全美治疗的39010例乳腺原位导管癌（DCIS），占533610例乳腺癌的7．3％，诊断依据美国癌肿联合会制定的标准，属0期癌。分析结果如下：（一）发病率自1985～1993年，DCIS的发病率自37％逐年增?
The National Cancer Database (NCDB) is an annual database of data collected throughout the United States. It collected 39010 cases of breast ductal carcinoma in situ (DCIS) from 1985 to 1993 in the United States, accounting for 7.36% of 533,610 breast cancers. The diagnosis is based on the criteria established by the American Cancer Society and is a stage 0 cancer. The results of the analysis are as follows: (i) Incidence rate Since 1985-1993, the incidence of DCIS increased from 37% year-on-year?