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  • EP696 Inoperable pelvic sidewall recurrence of gynecological cancer treated with proton and carbon ion radiotherapy: CNAO preliminary experience

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EP696 Inoperable pelvic sidewall recurrence of gynecological cancer treated with proton and carbon ion radiotherapy: CNAO preliminary experience
  1. A Barcellini1,
  2. V Vitolo1,
  3. R Lazzari2,
  4. L Cobianchi3,4,
  5. R Biffi5,
  6. A Facoetti6,
  7. MR Fiore1,
  8. B Vischioni1,
  9. A Iannalfi1,
  10. A Mirandola7,
  11. A Vai7,
  12. E Mastella7,
  13. C Laliscia8,
  14. A Gadducci9,
  15. F Raspagliesi10,
  16. L Preda4,11,
  17. R Orecchia1,12 and
  18. F Valvo1
  1. 1Radiation Oncology, National Center of Oncological Hadrontherapy (CNAO), Pavia
  2. 2Radiation Oncology, European Institute of Oncology, Milan
  3. 3General Surgery Department, Fondazione IRCCS Policlinico San Matteo
  4. 4Department of Clinical-Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia
  5. 5Division of Digestive Tract Surgery, European Institute of Oncology, Milan
  6. 6Radiobiology
  7. 7Medical Physics, National Center of Oncological Hadrontherapy (CNAO), Pavia
  8. 8Department of Translational Medicine, Division of Radiation Oncology
  9. 9Department of Clinical and Experimental Medicine, Division of Gynecology and Obstetrics, University of Pisa, Pisa
  10. 10Gynecologic Oncology, Fondazione IRCCS Istituto Nazionale Tumori, Milan
  11. 11Radiology, National Center of Oncological Hadrontherapy (CNAO), Pavia
  12. 12European Institute of Oncology, Milan, Italy

Abstract

Introduction/Background Re-irradiation of local recurrences of gynaecological cancer pose a difficult challenge to Oncologist. For their biological and physical characteristics particle therapy (PT) could be an interesting treatment.

Methodology The aim of the study was to evaluate the feasibility and early clinical outcome in patients (pts) with gynaecological pelvic sidewall recurrence (PSWr). Between May 2014 to December 2018, 10 patients (median age 56) with PSWr within or at the edge of the previously irradiated field were treated using PT. They had recurrence of: cervical (5), endometrial (3), uterine (1) and ovarian (1) cancer. Previous radiotherapy prescription dose ranged from 46 to 59.4 Gy and 5 patients underwent brachytherapy (range: 7–28 Gy).Two patients, with marginal lymph node recurrence, were irradiated with protons with up to a total dose of 25 GyRBE and 51 GyRBE, respectively. The remaining women underwent carbon-ion radiotherapy (median total dose 50.4 GyRBE; range: 36–57) administered in a median number of 12 fractions. Six patients with PSWr received surgical spacer placement by open surgery to keep intestinal tracts apart from the tumour as the distance between tumour and nearest intestinal tracts was not sufficient. No pts received concurrent chemotherapy. Preliminary local control (LC) and toxicity profile (according to CTCAE V4.03 scale) were evaluated.

Results All patients completed the planned treatment and no acute toxicities G>2 were observed. For the evaluable patients, 1 case of intermediate G≥3 toxicity was reported in women received sequential Bevacizumab (BV). For pts with a follow-up ≥3 months, median LC was 7 months (range: 3–14), median MFS was 4.5 months (range: 3–14,5) and median OS was 7 months (range: 3–14,5). 1 pt experienced local progression and 4 pts died for systemic progression. Data are still ongoing.

Conclusion For pts with PSWr a PT approach seems to be feasible and our results showed a promising short-term outcome and limited radiation-related side effects. Longer follow-up and large patient accrual are required.

Disclosure Nothing to disclose.

https://doi.org/10.1136/ijgc-2019-ESGO.750

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