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Published in: Radiation Oncology 1/2013

Open Access 01-12-2013 | Research

Stereotactic body radiotherapy using gated radiotherapy with real-time tumor-tracking for stage I non-small cell lung cancer

Authors: Tetsuya Inoue, Norio Katoh, Rikiya Onimaru, Shinichi Shimizu, Kazuhiko Tsuchiya, Ryusuke Suzuki, Jun Sakakibara-Konishi, Naofumi Shinagawa, Satoshi Oizumi, Hiroki Shirato

Published in: Radiation Oncology | Issue 1/2013

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Abstract

Background

To clarify the clinical outcomes of two dose schedule of stereotactic body radiotherapy (SBRT) for stage I non-small cell lung cancer (NSCLC) using a real-time tumor-tracking radiation therapy (RTRT) system in single institution.

Methods

Using a superposition algorithm, we administered 48 Gy in 4 fractions at the isocenter in 2005–2006 and 40 Gy in 4 fractions to the 95% volume of PTV in 2007–2010 with a treatment period of 4 to 7 days. Target volume margins were fixed irrespective of the tumor amplitude.

Results

In total, 109 patients (79 T1N0M0 and 30 T2N0M0). With a median follow-up period of 25 months (range, 4 to 72 months), the 5-year local control rate (LC) was 78% and the 5-year overall survival rate (OS) was 64%. Grade 2, 3, 4, and 5 radiation pneumonitis (RP) was experienced by 15 (13.8%), 3 (2.8%), 0, and 0 patients, respectively. The mean lung dose (MLD) and the volume of lung receiving 20 Gy (V20) were significantly higher in patients with RP Grade 2/3 than in those with RP Grade 0/1 (MLD p = 0.002, V20 p = 0.003). There was no correlation between larger maximum amplitude of marker movement and larger PTV (r = 0.137), MLD (r = 0.046), or V20 (r = 0.158).

Conclusions

SBRT using the RTRT system achieved LC and OS comparable to other SBRT studies with very low incidence of RP, which was consistent with the small MLD and V20 irrespective of tumor amplitude. For stage I NSCLC, SBRT using RTRT was suggested to be reliable and effective, especially for patients with large amplitude of tumor movement.
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Metadata
Title
Stereotactic body radiotherapy using gated radiotherapy with real-time tumor-tracking for stage I non-small cell lung cancer
Authors
Tetsuya Inoue
Norio Katoh
Rikiya Onimaru
Shinichi Shimizu
Kazuhiko Tsuchiya
Ryusuke Suzuki
Jun Sakakibara-Konishi
Naofumi Shinagawa
Satoshi Oizumi
Hiroki Shirato
Publication date
01-12-2013
Publisher
BioMed Central
Published in
Radiation Oncology / Issue 1/2013
Electronic ISSN: 1748-717X
DOI
https://doi.org/10.1186/1748-717X-8-69

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