Adaptive dose escalated radiotherapy in oropharyngeal cancers: a treatment planning feasibility study

Radiation Oncology

Ronan M. Valentine¹  Claire Paterson²  Laura Grocutt³ 

[1] Beatson West of Scotland Cancer Centre, Radiotherapy Physics, NHS Greater Glasgow and Clyde, Glasgow, UK;CRUK RadNet Glasgow, University of Glasgow, G61 1QH, Glasgow, UK;Beatson West of Scotland Cancer Centre, NHS Greater Glasgow and Clyde, Glasgow, UK;CRUK RadNet Glasgow, University of Glasgow, G61 1QH, Glasgow, UK;Beatson West of Scotland Cancer Centre, Radiotherapy Physics, NHS Greater Glasgow and Clyde, Glasgow, UK;

关键词: Head and neck cancer;    Dose escalation;    Treatment planning;    VMAT;    RapidPlan™;    Multi-criteria optimisation;    Simultaneous integrated boost;    Response adaptive;   

DOI  :  10.1186/s13014-022-01991-x

来源: Springer

【 摘 要 】

BackgroundA significant proportion of patients with poor prognosis squamous cell cancer of the oropharynx relapse loco-regionally despite radical (chemo)radiotherapy. If a predictive biomarker for disease control can be identified during treatment then individualised and adaptive treatment strategies may be employed. The aim of this study is to assess the feasibility of adaptive and dose-escalated RT to the gross tumour volume without increasing surrounding planning target volume doses and maintaining clinically acceptable organs at risk doses.Materials and methodsTwenty representative patients with poor prognosis locally advanced OPSCC who were known to have relapsed post RT, were re-planned retrospectively using Eclipse TPS v15.5, RapidPlan™ and multi-criteria optimisation. In our centre, PTV65 is treated with 65 Gy in 30 fractions while areas at risk of containing microscopic disease (PTV54) are treated synchronously to 54 Gy in 30 fractions. The original clinical plans were re-optimised to act as controls (Group I). These plans were split into two plans of 15 fractions each, with the latter 15 fractions used to escalate the dose to the GTV to 73 Gy (Group II) and 82 Gy (Group III). Plan sums were created for the total 30 fractions to record plan evaluation parameters along with assessments of plan deliverability.ResultsFor all groups, the dose coverage at D98% and D50% for the PTVs were comparable. The D2% dose levels for PTV65-GTV increased. All dose levels associated with PTV54 remained largely unaffected by the dose escalation regimens. Conformity indices for PTV65 and PTVAll (PTV65 plus PTV54) reveal comparable target volume coverage across all three groups. Despite the GTV being escalated by 12.3% and 26.2% in groups II and III, the volume of GTV receiving > 84 Gy was considerably less than 1.75 cc. While OAR doses increased for the escalated groups, these increases were not clinically significant.ConclusionThis planning feasibility study exploring RapidPlan™ combined with multi-criteria optimisation has demonstrated that doses to the GTV may be escalated without increasing PTV65-GTV, PTV54 or OAR doses considerably, suggesting an interventional clinical trial using this approach would be feasible.

【 授权许可】

CC BY