Predicting which patients may benefit from the hybrid intracavitary+interstitial needle (IC/IS) applicator for advanced cervical cancer: A dosimetric comparison and toxicity benefit analysis

نویسندگان

چکیده

PurposeThe purpose of this study is to compare the predicted rate local control and bladder rectum toxicity rates for image-guided adaptive brachytherapy plans using a tandem ovoid (T/O) applicator versus simulated hybrid intracavitary/interstitial ring with needles (T/R + N) patients locally advanced cervical cancer (LACC).Methods MaterialsPatients ≥ FIGO Stage IIB treated T/O from single institution were included. Simulated treatment created T/R N best high-risk clinical target volume (CTV) coverage minimal dose organs at risk. Three-year was estimated published dose-volume effect relationships. Next, CTV EQD2 D90 calculated, estimated. Analysis performed in subpatient groups defined based on tumor ratio maximal radii (RR) that reflects shape asymmetry.ResultsImprovements 0.8, 4.1, 1.6, 3.9% <35 cc, ≥35 RR < 2.0, ≥2.0, respectively, latter three being statistically significant. Predicted reductions Grade 2–4 significant all except when normalized same as plans. Comparing unnormalized plans, 2.0. reduction larger large or RR, although some relatively small.ConclusionsCases (volume cc) asymmetry (RR 2.0) would probably benefit more use applicators.

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ژورنال

عنوان ژورنال: Brachytherapy

سال: 2021

ISSN: ['1873-1449', '1538-4721']

DOI: https://doi.org/10.1016/j.brachy.2020.09.004