PURPOSE: To evaluate morbidity and oncological outcome in a multicentre series of women with gynaecological malignancies infiltrating pelvic side wall (PSW) that received laterally extended pelvic resection (LEPR). METHODS: Patients operated between 2007 and 2017 at three institutions were included. LEPR was defined as an en bloc lateral resection of a pelvic tumour involving sidewall muscle, and/or bone, and/or major nerve, and/or major vascular structure. Postsurgical complications and survivals were evaluated. RESULTS: Sixty-three women with gynaecological tumours involving PSW were treated with LEPR. Five women underwent primary LEPR, whereas 58 (92%) patients needed LEPR because of recurrence. Twenty-four women (38%) received previous radiation therapy before the surgery. R0 resection was achieved in 54 patients (85.7%), whereas the pathologic margins were microscopically and macroscopically positive in 8 (12.7%) patients and 1 (1.6%) patient, respectively. There was one perioperative death, whereas major postoperative complications occurred in 17 patients (27.7%). Thirty (47.5%) women experienced recurrences: 24/54 (44.4%) were in the R0 group, and 6/9 (66.6%) were in the R1 group, with a median PFS of 15 months and 7 months, respectively (p = 0.024). In total, 11 of 54 (20.3%) patients died of disease in the R0 group and 5 of 9 (55.5%) in the R1 group; a median OS was not reached and was 32 months for R0 and R1 groups, respectively (p = 0.033). CONCLUSIONS: Involvement of the PSW should not prevent obtaining R0 resection. Although the LEPR is associated with considerable morbidity (≈ 30%), a long-term survival seems to be achieved in those women with complete resection.

Department of Women's and Children's Health Fondazione Policlinico Universitario A Gemelli IRCCS Università Cattolica del Sacro Cuore Rome Italy

Division of Vascular Surgery Fondazione Policlinico Universitario A Gemelli IRCCS Università Cattolica del Sacro Cuore Rome Italy

Gynaecologic Oncology Center Department of Obstetrics and Gynecology 1st Faculty of Medicine Charles University Prague General University Hospital Prague Prague Czech Republic

Northern Gynaecological Oncology Centre Queen Elizabeth Hospital Gateshead UK

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