Feasibility and Safety of High Dose Chemoradiation in Locally Advanced Cervical Cancer: A Preliminary Experience of Gynecologic Oncology Management Italian Team
DOI:
https://doi.org/10.12974/2309-6160.2013.01.01.2Keywords:
Advanced cervical cancer, chemoradiation, chemotherapy, brachytherapy, external radiotherapy, Intensity Modulated Radiation Therapy, Programmed Temperature Vaporization, Biological Effective Dose, Radiation Therapy Oncology Group, colposcopy, cytology, gynecological cancer, lomboaortic nodes, CT-scan, RM, and PET/CT.Abstract
Locally advanced cervical cancer has a poor prognosis and is difficult to treat by surgery; authors’ evaluated feasibility and safety of the simultaneous integrated boost (SIB) technique for dose escalation in patients with cervical cancer using a rotational dynamic Intensity Modulated Radiation Therapy Technique (VMAT®).
Authors evaluated 10 patients affected by loco-regionally advanced, node negative, inoperable cervical cancer. All women received primary chemoradiation (CRT). Six pts received three cycles of platinum-based chemotherapy (CT) plus CRT. Three Programmed Temperature Vaporization (PTV) were delineated: PTV1 (primary, cervix and parametria with a 1cm-margin); PTV2 (body of uterus with a 1cm-margin); PTV3 (pelvic nodes). PTV1 was defined using image fusion between CT-scan and RM or PET/CT. Treatment plans, calculated using a rotational dynamic Intensity Modulated Radiation Therapy (IMRT) system on Oncentra Masterplan® (VMAT®), and consisted in a simultaneous integrated boost. Total treatment time was 45 days. Concomitant CT consisted of weekly cisplatin 40 mg/m2. Dose–volume histograms and acute gastrointestinal, genitourinary, and hematological toxicity were evaluated. Secondary endpoint was evaluation of short term disease free survival. Three months after CTRT, patients were revaluated with colposcopy and cytology and Pelvic imaging. After six and twelve months from CTRT, reevaluation included PET-CT or Chest CT scan and Abdominal and Pelvic RM. All patients concluded radiation without suspension. Cytology demonstrated complete response (CR) in 4 pts in the ERT fraction of brachytherapy (BRT) group and in 1 pts in ERT alone group. All other patients showed a partial response (PR) > 75%. After a median follow up of 20 month (range 16-22), 5 patients are free from disease (NED), 4 patients are alive with disease (AWD) and 1 patient died after three months (DOD). In 2 AWD patients, re-staging PET showed a RC of pelvic disease with evidence of disease in lomboaortic nodes. One of them received salvage radiation therapy on recurrence. After this preliminary experience, in patients with inaccessible cervical canal, authors could propose the dose escalation on PTV1, with the aim of delivering BED as near as possible to 85Gy.
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