Journal
RADIOTHERAPY AND ONCOLOGY
Volume 120, Issue 3, Pages 434-440Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.radonc.2016.03.020
Keywords
Cervical cancer; Image guided adaptive radiotherapy; Local control; Morbidity
Funding
- Elekta
- Varian Medical System
- Varian Medical System Vienna Medical University
- Danish Cancer Society
- FP7 Programme [ICT-2011.5.2]
- The Danish Cancer Society [R108-A6854, R90-A5903] Funding Source: researchfish
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Background and purpose: Image guided adaptive brachytherapy (IGABT) using intracavitary applicators (IC) has led to a significant improvement of local control in locally advanced cervical cancer (LACC). Further improvement has been obtained with combined intracavitary/interstitial (IC/IS) applicators. The aim of this analysis was to evaluate the impact on local control and late morbidity of application of combined IS/IC brachytherapy in a large multicentre population. Material/methods: 610 patients with LACC from the retroEMBRACE study were included. Patients were divided into an IC group (N = 310) and an IC/IS group (N = 300). The IC/IS group was defined from the time point, when a centre performed IC/IS brachytherapy in more than 20% of cases. Results: With systematic usage of IC/IS the D90 of CTVHR increased from 83 +/- 14 Gy to 92 +/- 13 Gy (p < 0.01). No difference in doses to organs at risk was found. The 3-year local control rate in patients having a CTVHR volume >= 30 cm(3) was 10% higher (p = 0.02) in the IC/IS group. No difference was found for CTVHR < 30 cm(3) (p = 0.50). No significant difference in late morbidity was found between the IC/IS group and IC group. Conclusion: Combined IC/IS brachytherapy improves the therapeutic ratio in LACC by enabling a tumour specific dose escalation resulting in significantly higher local control in large tumours without adding treatment related late morbidity. (C) 2016 Elsevier Ireland Ltd. All rights reserved.
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