调强放疗治疗晚期宫颈癌：与常规放疗的放射量测定和临床结局比较

Department of Gynecologic Oncology, Shandong Cancer Hospital, Jinan 250117, China

Objective: The aim of this study is to evaluate the dosimetry, efficacy and toxicity of reduced field intensity-modulated radiation therapy (RF-IMRT) for patients with advanced cervical cancer. Methods: From August 2005 to August 2010, 60 patients with stage IIB-IIIB cervical cancer underwent reduced field IMRT (RF-IMRT group) and 62 patients treated with conventional radiotherapy (c-RT group) were enrolled. The RF-IMRT plans were as follows: whole pelvic IMRT plan was performed to deliver a dose of 30 Gy firstly, then the irradiated volume was reduced to lymphatic drainage region as well as paracervix and parametrium for an additional 30 Gy boost. Intracavitary brachytherapy and concurrent chemotherapy were performed during external irradiation. The tumor coverage and normal tissue avoidance were evaluated. Treatment response, toxicities and survival were assessed. Results: The mean dose delivered to the planning target volume was significantly higher in RF-IMRT group than in c-RT group (61.5 vs. 50.8 Gy, P = 0.046). IMRT plans yielded better dose conformity to the target and better sparing of the rectal, bladder and small intestine. The RF-IMRT patients experienced significantly lower acute and chronic toxicities with comparable short-term effects than did those treated with conventional RT (CR: 87.7% vs. 88.3%, P = 0.496; PR: 7.0% vs. 6.7%, P = 0.440). No significant differences were found between treatment groups for 1 year, 3 year, and 5 year overall survival (OS) levels, although the latter approached statistical significance in favor of IMRT, while a significantly higher progression-free survival (PFS; P = 0.031) was seen for IMRT. Conclusions: RF-IMRT yields improved dose distributions, with lower toxicities, while providing comparable clinical outcomes. The increased PFS may be an advantage. © 2012 Elsevier Inc. All rights reserved.

Sheng, X.-G.; Department of Gynecologic Oncology, Shandong Cancer Hospital, Jinan 250117, China; email: jnsd2000@yahoo.cn