Dose-volume histogram-based comparison of conventional and hypofractionated radiotherapy: lifetime attributable risk estimation in Indian breast carcinoma patients
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Summary
This summary is machine-generated.Hypofractionated (HF) intensity-modulated radiation therapy (IMRT) significantly lowers secondary lung cancer risk in postmastectomy patients compared to conventional fractionated (CF) IMRT. However, contralateral breast cancer risk remains largely unchanged, indicating a need for further optimization.
Area Of Science
- Radiation oncology
- Medical physics
- Cancer risk assessment
Background
- Postmastectomy radiotherapy (PMRT) aims to eradicate residual cancer cells but can increase secondary cancer risks.
- Intensity-modulated radiation therapy (IMRT) is a common PMRT technique, with both conventional fractionated (CF) and hypofractionated (HF) schedules available.
- Understanding secondary cancer risks in the contralateral breast (CB) and ipsilateral lung (IL) is crucial for optimizing PMRT.
Purpose Of The Study
- To investigate and compare secondary cancer risks in the contralateral breast (CB) and ipsilateral lung (IL) for PMRT patients treated with forward-planned IMRT.
- To evaluate differences in cancer risk between conventional fractionated (CF) IMRT and hypofractionated (HF) IMRT using Dose-Volume Histogram (DVH)-based metrics.
- This study is the first to analyze DVH-based secondary cancer risks for forward-planned IMRT in PMRT.
Main Methods
- Retrospective analysis of 20 PMRT patients (aged 37-69) treated with 6 MV forward-planned IMRT.
- Treatment plans included both CF IMRT (50 Gy in 25 fractions) and HF IMRT (42.56 Gy in 16 fractions).
- Secondary cancer risks (Organ Equivalent Dose, Excess Absolute Risk, Lifetime Attributable Risk, Relative Risk) for CB and IL were calculated using the Schneider non-linear mechanistic model and differential DVH.
Main Results
- HF IMRT significantly reduced ipsilateral lung (IL) secondary cancer risk compared to CF IMRT (P=0.0001).
- Lifetime Attributable Risk for IL cancer decreased from 54.9%-75.5% (CF) to 48.3%-66.5% (HF), with a corresponding decline in Relative Risk.
- Contralateral breast (CB) cancer risks showed minimal change between CF and HF IMRT, with only a slight reduction in Lifetime Attributable Risk and stable Relative Risk.
Conclusions
- Hypofractionated IMRT is a safer PMRT option than conventional fractionated IMRT due to its significant reduction in ipsilateral lung secondary cancer risk.
- Contralateral breast cancer risks were not substantially altered by hypofractionation, suggesting that further dose optimization strategies are needed for this site.
- The findings support the use of HF IMRT for PMRT to mitigate lung cancer risks, while highlighting the ongoing need for research into optimizing CB dose distribution.
View abstract on PubMed
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