Abstract
INTRODUCTION: The aim of this study was to identify subgroups of locally advanced NSCLC patients with a distinct treatment response during concurrent chemoradiotherapy (CCRT). Subsequently, we investigated the association of subgroup membership with treatment outcomes.
METHODS: 394 NSCLC-patients treated with CCRT between 2007 and 2013 were included. Gross Tumor Volume (GTV) during treatment was determined and relative GTV-volume change from the planning-CT was subsequently calculated. Latent Class Mixed Modeling (LCMM) was used to identify subgroups with distinct volume changes during CCRT. The association of subgroup membership with overall survival (OS), progression free survival (PFS) and local regional control (LRC) was assessed using cox regression analyses.
RESULTS: Three subgroups of GTV-volume change during treatment were identified, with each subsequent subgroup showing a more profound reduction of GTV during treatment. No associations between subgroup membership and OS, PFS nor LRC were observed. Nonetheless, baseline GTV (HR1.42; 95%CI 1.06-1.91) was significantly associated with OS.
CONCLUSIONS: Three different subgroups of GTV-volume change during treatment were identified. Surprisingly, these subgroups did not differ in their risk of treatment outcomes. Only patients with a larger GTV at baseline had a significantly worse OS. Therefore, risk stratification at baseline might already be accurate in identifying the best treatment strategy for most patients.
Original language | English |
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Pages (from-to) | 44-51 |
Number of pages | 8 |
Journal | Radiotherapy and Oncology |
Volume | 146 |
Early online date | 27 Feb 2020 |
DOIs | |
Publication status | Published - May 2020 |
Bibliographical note
Copyright © 2020 Elsevier B.V. All rights reserved.Funding
The department of radiation oncology of the Netherlands Cancer Institute receives license fees from Elekta Oncology Systems Ltd. This research was partially funded by a Top sector Life Sciences & Health (LSH-TKI Foundation) public–private partnership grant (LSHM15036) in collaboration with Elekta Oncology Systems Ltd. This work was sponsored in part by a research grant from Elekta Oncology Systems Ltd .
Funders | Funder number |
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Elekta Oncology Systems Ltd | |
LSH-TKI Foundation | LSHM15036 |
Keywords
- Concurrent chemoradiation
- Cone-Beam-CT
- Latent Class Mixed Modelling
- Locally Advanced NSCLC
- Volumetric changes