open access

Vol 21, No 3 (2016)
Original research articles
Published online: 2016-05-01
Submitted: 2015-08-24
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Reducing radiation-associated toxicity using online image guidance (IGRT) in prostate cancer patients undergoing dose-escalated radiation therapy

Martina Becker-Schiebe, Ali Abaci, Tahera Ahmad, Wolfgang Hoffmann
DOI: 10.1016/j.rpor.2016.01.005
·
Rep Pract Oncol Radiother 2016;21(3):188-194.

open access

Vol 21, No 3 (2016)
Original research articles
Published online: 2016-05-01
Submitted: 2015-08-24

Abstract

Aim

To determine the influence of IGRT in terms of toxicities compared to non-IGRT patients undergoing definitive RT.

Background

Image-guided radiotherapy (IGRT) enables immediate correction of target movement by online imaging. For prostate cancer patients undergoing radiation therapy (RT), a geographical miss of the prostate may result in increased dose–volume effects in the rectum and bladder.

Methods

A total of 198 prostate cancer patients treated between 2003 and 2013 were recruited randomly for this evaluation. The rates of genitourinary (GU) and gastrointestinal (GI) toxicity for 96 non-IGRT patients (total dose: 72/73.8[[ce:hsp sp="0.25"/]]Gy) were compared to those for 102 IGRT patients (total dose: 77.4[[ce:hsp sp="0.25"/]]Gy) according to the Common Toxicity Criteria Version 3.0 (CTCAEv3.0). Follow-up information included treatment-related symptoms and PSA relapse.

Results

After a median follow-up of 55.4 months, a statistically significant difference was noted for acute GI toxicities ≥1 in favour of IGRT. Significantly more patients treated by IGRT were free of acute GI symptoms (43% vs. 19%, p[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]0.0012). In the non-IGRT group, more patients experienced acute GU side effects (89% vs. 80%, p[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]0.07). Late toxicity scores were comparable for both cohorts.

Conclusions

Based on the data, we demonstrated that despite dose escalation, IGRT enabled us to reduce the GI side effects of radiation. IGRT can therefore be considered to be the standard of care for dose-escalated RT of localized prostate cancer.

Abstract

Aim

To determine the influence of IGRT in terms of toxicities compared to non-IGRT patients undergoing definitive RT.

Background

Image-guided radiotherapy (IGRT) enables immediate correction of target movement by online imaging. For prostate cancer patients undergoing radiation therapy (RT), a geographical miss of the prostate may result in increased dose–volume effects in the rectum and bladder.

Methods

A total of 198 prostate cancer patients treated between 2003 and 2013 were recruited randomly for this evaluation. The rates of genitourinary (GU) and gastrointestinal (GI) toxicity for 96 non-IGRT patients (total dose: 72/73.8[[ce:hsp sp="0.25"/]]Gy) were compared to those for 102 IGRT patients (total dose: 77.4[[ce:hsp sp="0.25"/]]Gy) according to the Common Toxicity Criteria Version 3.0 (CTCAEv3.0). Follow-up information included treatment-related symptoms and PSA relapse.

Results

After a median follow-up of 55.4 months, a statistically significant difference was noted for acute GI toxicities ≥1 in favour of IGRT. Significantly more patients treated by IGRT were free of acute GI symptoms (43% vs. 19%, p[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]0.0012). In the non-IGRT group, more patients experienced acute GU side effects (89% vs. 80%, p[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]0.07). Late toxicity scores were comparable for both cohorts.

Conclusions

Based on the data, we demonstrated that despite dose escalation, IGRT enabled us to reduce the GI side effects of radiation. IGRT can therefore be considered to be the standard of care for dose-escalated RT of localized prostate cancer.

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Keywords

Acute toxicity; Image guidance; Late toxicity; Prostate cancer; Radiotherapy

About this article
Title

Reducing radiation-associated toxicity using online image guidance (IGRT) in prostate cancer patients undergoing dose-escalated radiation therapy

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 21, No 3 (2016)

Pages

188-194

Published online

2016-05-01

DOI

10.1016/j.rpor.2016.01.005

Bibliographic record

Rep Pract Oncol Radiother 2016;21(3):188-194.

Keywords

Acute toxicity
Image guidance
Late toxicity
Prostate cancer
Radiotherapy

Authors

Martina Becker-Schiebe
Ali Abaci
Tahera Ahmad
Wolfgang Hoffmann

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