References1 Ducimeti ere F, Lurkin A, Ranch ere-Vince D et al. Incidence of sarcoma histotypes and molecular subtypes in a prospective epidemiological study with central pathology review and molecular testing. PLoS ONE 2011; 6: e20294. 2 Liles JS, Tzeng CW, Short JJ, Kulesza P, Heslin MJ. Retroperitoneal and intra-abdominal sarcoma. Curr. Probl. Surg. 2009; 46: 445-503. 3 Lewis JJ, Leung D, Woodruff JM, Brennan MF. Retroperitoneal soft-tissue sarcoma: analysis of 500 patients treated and followed at a single institution. Ann. Surg. 1998; 228: 355-65. 4 Nathan H, Raut CP, Thornton K et al. Predictors of survival after resection of retroperitoneal sarcoma: a population-based analysis and critical appraisal of the AJCC staging system. Ann. Surg. 2009; 250: 970-6. 5 Bonvalot S, Rivoire M, Castaing M et al. Primary retroperitoneal sarcomas: a multivariate analysis of surgical factors associated with local control. J. Clin. Oncol. 2009; 27: 31-7. 6 Lehnert T, Cardona S, Hinz U et al. Primary and locally recurrent retroperitoneal soft-tissue sarcoma: local control and survival. Eur. J. Surg. Oncol. 2009; 35: 986-93. 7 Anaya DA, Lahat G, Wang X et al. Postoperative nomogram for survival of patients with retroperitoneal sarcoma treated with curative intent. Ann. Oncol. 2010; 21: 397-402. 8 Strauss DC, Hayes AJ, Thway K, Moskovic EC, Fisher C, Thomas JM. Surgical management of primary retroperitoneal sarcoma. Br. J. Surg. 2010; 97: 698-706. 9 Gronchi A, Miceli R, Shurell E et al. Outcome prediction in primary resected retroperitoneal soft tissue sarcoma: histology-specific overall survival and disease-free survival nomograms built on major sarcoma center data sets. J. Clin. Oncol. 2013; 31: 1649-55. 10 Toulmonde M, Bonvalot S, Meeus P et al. Retroperitoneal sarcomas: patterns of care at diagnosis, prognostic factors and focus on main histological subtypes: a multicenter analysis of the French Sarcoma Group. Ann. Oncol. 2014; 25: 735-42. 11 Smith HG, Panchalingam D, Hannay JA et al. Outcome following resection of retroperitoneal sarcoma. Br. J. Surg. 2015; 102: 1698-709. 12 Gronchi A, Miceli R, Allard MA et al. Personalizing the approach to retroperitoneal soft tissue sarcoma: histology-specific patterns of failure and postrelapse outcome after primary extended resection. Ann. Surg. Oncol. 2015; 22: 1447-54. 13 Tan MC, Yoon SS. Surgical management of retroperitoneal and pelvic sarcomas. J. Surg. Oncol. 2015; 111: 553-61. 14 Abdelfatah E, Guzzetta AA, Nagarajan N et al. Long-term outcomes in treatment of retroperitoneal sarcomas: a 15 year single-institution evaluation of prognostic features. J. Surg. Oncol. 2016; 114: 56-64. 15 Stahl JM, Corso CD, Park HS et al. The effect of microscopic margin status on survival in adult retroperitoneal soft tissue sarcomas. Eur. J. Surg. Oncol. 2017; 43: 168-74. 16 Krane A, Crago AM. The importance of surgical margins in retroperitoneal sarcoma. J. Surg. Oncol. 2016; 113: 270-6. 17 Chou YS, Liu CY, Chang YH et al. Prognostic factors of primary resected retroperitoneal soft tissue sarcoma:...