Objective: To investigate the multiple origin of retroperitoneal liposarcoma and its postoperative prognosis. Methods: A total of 49 retroperitoneal liposarcoma patients underwent total (ipsilateral) retroperitoneal lipectomy in our center from May 2017 to December 2019 were recruited. Clinical data and the follow-up information were reviewed and the origin and prognosis were analyzed. Results: A total of 15 patients were pathologically diagnosed as multiple primary cancer (MPC), the incidence rate of retroperitoneal liposarcoma with MPC was 30.6% (15/49), while other 34 cases was non-MPC. The postoperative recurrence rates of patients with high differentiation and de-differentiation retroperitoneal liposarcoma were 31.8% and 44.4%, without significant difference (P>0.05). The postoperative recurrence rates of MPC and non-MPC were 40.0% and 38.2%, without significant difference (P>0.05). Five cases died within the follow-up. Conclusion: Retroperitoneal liposarcoma might origin form MPC, and total (ipsilateral) retroperitoneal lipectomy is recommended to reduce the recurrence rate.
目的： 探讨多原发腹膜后脂肪肉瘤的手术治疗及其预后情况。 方法： 选取2017年5月至2019年12月于北京大学国际医院行腹膜肿瘤切除+腹膜后脂肪清扫的49例腹膜后脂肪肉瘤患者，收集患者的临床病理资料，分析腹膜后脂肪肉瘤的多原发情况及预后。 结果： 49例患者中，病理证实存在多个原发肿瘤(多发组)15例，非多个肿瘤(单发组)34例，多原发腹膜后脂肪肉瘤的发生率为30.6%(15/49)。高分化脂肪肉瘤和去分化脂肪肉瘤患者的疾病复发率分别为31.8%和44.4%，差异无统计学意义(P>0.05)。多发组和单发组患者的疾病复发率分别为40.0%和38.2%，差异无统计学意义(P>0.05)。全组49患者中，死亡5例。 结论： 腹膜后脂肪肉瘤存在多原发性，行腹膜后脂肪切除术可使多原发患者的复发情况获益。.
Keywords: Multiple primary cancer; Retroperitoneal liposarcoma; Total (ipsilateral) retroperitoneal lipectomy.