1968年～1985年,美国波士顿放疗中心(JCRT)收治了1624例AJCC临床分期Ⅰ或Ⅱ期的浸润性乳腺癌,行保守手术和放疗。673例(48％)腋淋巴结阴性,且未接受任何辅助性全身治疗。将673例中手术和放疗日期均明确的653例患者作为研究对象。病理资料包括组织学亚型、分级、核分级、导管内容物含 From 1968 to 1985, the American Boston Radiotherapy Center (JCRT) treated 1,624 patients with stage I or II invasive breast cancer of the AJCC clinical stage who underwent conservative surgery and radiotherapy. 673 (48%) axillary lymph nodes were negative and did not receive any adjuvant systemic therapy. 673 patients with clear surgical and radiotherapy dates were selected as the study subjects. Pathological data included histological subtypes, grading, nuclear grading, and contents of catheters.