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Radiation Oncology
Published in: Radiation Oncology 1/2017

Open Access 01-12-2017 | Research

Comparison of volumetric-modulated arc therapy using simultaneous integrated boosts (SIB-VMAT) of 45 Gy/55 Gy in 25 fractions with conventional radiotherapy in preoperative chemoradiation for rectal cancers: a propensity score case-matched analysis

Authors: Hideomi Yamashita, Soichiro Ishihara, Hiroaki Nozawa, Kazushige Kawai, Tomomichi Kiyomatsu, Kae Okuma, Osamu Abe, Toshiaki Watanabe, Keiichi Nakagawa

Published in: Radiation Oncology | Issue 1/2017

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Abstract

Background and purpose

The aim of this retrospective study was to compare volumetric-modulated arc therapy using simultaneous integrated boosts (SIB-VMAT) of 45 Gy/55 Gy in 25 fractions with three-dimensional conformal radiotherapy (3D–CRT) in preoperative chemoradiation for rectal cancers.

Methods and materials

In the propensity score-matching analysis of 1:2, we selected 60 patients from the SIB-VMAT group and 120patients from the 3D–CRT group matched pairings out of 145 patients between 2005 and 2015. The regimen of concurrent combined chemotherapy was oral uracil/tegafur plus leucovorin with/without irinotecan.

Results

There were no significant differences between the two groups, in pathological complete response rates (pCR) (11% in the 3D–CRT group vs. 17% in the SIB-VMAT group, P = 0.39), pathological response rates (44% vs. 60%, P = 0.77), disease-free survival (P = 0.32), or local control (P = 0.52). The SIB-VMAT method marginally improved the rate of pathological grade 2–3 effects and the OS was significantly better in patients with grade 2–3 effects. Recurrence was seen in 36 patients (30%) in the 3D–CRT group and 19 patients (32%) in the SIB-VMAT group. The first distant recurrence site in the SIB-VMAT group was liver in 6 patients and lung in 8 patients. The obvious radiation-induced late toxicity in the SIB-VMAT group was recto-vesical fistula in two patients.

Conclusions

The SIB-VMAT may be a promising method for preoperative CRT of rectal cancer.
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Metadata
Title
Comparison of volumetric-modulated arc therapy using simultaneous integrated boosts (SIB-VMAT) of 45 Gy/55 Gy in 25 fractions with conventional radiotherapy in preoperative chemoradiation for rectal cancers: a propensity score case-matched analysis
Authors
Hideomi Yamashita
Soichiro Ishihara
Hiroaki Nozawa
Kazushige Kawai
Tomomichi Kiyomatsu
Kae Okuma
Osamu Abe
Toshiaki Watanabe
Keiichi Nakagawa
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Radiation Oncology / Issue 1/2017
Electronic ISSN: 1748-717X
DOI
https://doi.org/10.1186/s13014-017-0894-9

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