Association of a high versus low number of negative lymph nodes removed with survival and recurrence-free survival after lymph node dissection in breast cancer: a systematic review and meta-analysis of observational studies

乳腺癌淋巴结清扫术后，切除的阴性淋巴结数量多与少与生存率和无复发生存率的关系：一项观察性研究的系统评价和荟萃分析