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我院１９７２～１９９６年间共收治乳腺导管内癌５２例，约占同期乳腺癌１－６％，现就其临床特征和疗效分析报告如下。临床资料：（１）临床表现：５２例患者，年龄３２～７４岁，中位年龄４６岁。病期１个月至６年，中位时间为９个月，其中２０例１年以上。自觉症状为乳腺肿?
In our hospital from 1972 to 1996 a total of 52 cases of intraductal breast cancer were treated, accounting for about 1-6% of breast cancer in the same period. The clinical characteristics and efficacy of the analysis are reported below. Clinical data: (1) Clinical manifestations: 52 patients, aged 32 to 74 years, median age 46 years. The disease period was from 1 month to 6 years and the median time was 9 months, of which 20 cases were more than 1 year. Symptoms of breast swelling?