在美国,保乳手术已成为乳腺导管原位癌(ductal carcinoma in situ,DCIS)患者的首选术式。随机临床试验结果显示,术后放射治疗可显著降低患者的局部复发率。但是,回顾分析研究结果提示:对于病灶较小尤其是组织学分级为中低级的患者而言,无论接受或不 In the United States, breast conserving surgery has become the preferred procedure for patients with ductal carcinoma in situ (DCIS). Randomized clinical trial results show that postoperative radiotherapy can significantly reduce the local recurrence rate in patients. However, retrospective analysis of the results suggest that: for smaller lesions, especially in patients with histological grade of low to moderate, with or without acceptance