乳腺癌是女性最常见的恶性肿瘤之一,全世界每年约有120万妇女发病,有50万妇女死于乳腺癌。其发病率呈现逐年增高趋势,在我国女性中其发病率仅次于宫颈癌。越来越多的乳腺癌被早期发现。术后放疗在保乳治疗中具有重要意义,而早期乳腺癌保乳术加术后放疗与根治性手术疗效相似。近期研究表明,保乳术后90%以上的复 Breast cancer is one of the most common malignant tumors in women, with an estimated 1.2 million women worldwide each year and 500,000 women dying of breast cancer. The incidence showed an increasing trend year after year, its incidence in women in China is second only to cervical cancer. More and more breast cancer is discovered early. Postoperative radiotherapy in breast conserving treatment is of great significance, and breast conserving surgery and postoperative radiotherapy and radical surgery similar efficacy. Recent studies have shown that more than 90% after breast-conserving surgery