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Open Access 01-12-2012 | Research

Prognostic factors for local control of stage I non-small cell lung cancer in stereotactic radiotherapy: a retrospective analysis

Authors: Yuko Shirata, Keiichi Jingu, Masashi Koto, Masaki Kubozono, Ken Takeda, Toshiyuki Sugawara, Noriyuki Kadoya, Haruo Matsushita

Published in: Radiation Oncology | Issue 1/2012

Abstract

Background

The purpose of this study is to investigate the prognostic factors of stereotactic radiotherapy for stage I NSCLC to improve outcomes.

Methods

Stage I non-small cell lung cancer patients who were treated with stereotactic radiotherapy between 2005 and 2009 at our hospital were enrolled in this study. The primary endpoint was local control rate. Survival estimates were calculated from the completion date of radiotherapy using the Kaplan-Meier method. The prognostic factors including patients’ characteristics and dose-volume histogram parameters were evaluated using Cox’s proportional hazard regression model.

Results

Eighty patients (81 lesions) treated with 3 dose levels, 48 Gy/4 fractions, 60 Gy/8 fractions and 60 Gy/15 fractions, were enrolled in this study. Median follow-up was 30.4 months (range, 0.3 – 78.5 months). A Cox regression model showed T factor (p = 0.013), biological effective dose calculated from prescribed dose (BED₁₀) (p = 0.048), and minimum dose for PTV (p = 0.013) to be prognostic factors for local control. Three-year overall survival rate and local control rate were 89.9% (T1: 86.8%, T2: 100%) and 89.0% (T1: 97.9%; T2: 64.8%), respectively. When the 3-year local control rates were examined by prescribed doses, they were 100% for the dose per fraction of 48 Gy /4 fractions (105.6 Gy BED₁₀), 82.1% for 60 Gy/8 fractions (105 Gy BED₁₀), and 57.1% for 60 Gy/15 fractions (84 Gy BED₁₀). The median value of the minimum dose for PTV (%) was 89.88 (%), and the 3-year local control rates were 100% in those with the minimum dose for PTV (%) ≥ 89.88% and 79.2% in those with the minimum dose for PTV (%) < 89.88%.

Conclusions

Our results suggest that T factor, BED₁₀, and minimum dose for PTV influence the local control rate. Local control rate can be improved by securing the minimum dose for PTV.

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Title: Prognostic factors for local control of stage I non-small cell lung cancer in stereotactic radiotherapy: a retrospective analysis
Authors: Yuko Shirata
Keiichi Jingu
Masashi Koto
Masaki Kubozono
Ken Takeda
Toshiyuki Sugawara
Noriyuki Kadoya
Haruo Matsushita
Publication date: 01-12-2012
Publisher: BioMed Central
Published in: Radiation Oncology / Issue 1/2012
Electronic ISSN: 1748-717X
DOI: https://doi.org/10.1186/1748-717X-7-182

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Prognostic factors for local control of stage I non-small cell lung cancer in stereotactic radiotherapy: a retrospective analysis

Abstract

Background

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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