Abstract
Objectives
This study aims to (a) prospectively determine if multiple dwell (multidwell) position dose delivery can decrease skin dose and resultant toxicity over single-dwell balloon-catheter partial breast irradiation and (b) evaluate whether specific skin parameters could be safely used instead of skin–balloon distance alone for predicting toxicity and treatment eligibility.
Methods
A single-arm phase II study using a Simon two-stage design was performed on 28 women with stage 0–II breast cancer. All patients were treated with multidwell position balloon-catheter brachytherapy. The primary endpoint was ≥ grade 2 skin toxicity. Initial entry required a balloon–skin distance of ≥7 mm. Based on the toxicity in the first 16 patients, additional patients were treated irrespective of skin–balloon distance as long as the D max to 1 mm skin thickness was <130 %.
Results
Compared with the phantom single-dwell plans, multidwell planning yielded superior PTV coverage as per median V90, V95, and V100 but had slightly worse V150, V200, and DHI. D max to skin was decreased by multidwell planning at multiple skin thicknesses. The most common acute toxicity was grade 1 erythema (57 %), and only two patients (7 %) developed acute grade 2 toxicity (erythema). Late grade 1 fibrosis was seen in 32 %. No patients experienced grade 3, 4, or 5 toxicity.
Conclusions
Multidwell position planning for balloon-catheter brachytherapy results in lower skin doses with equal to superior PTV coverage and an overall low rate of initial skin toxicity. Our data suggest that limiting the D max to <130 % to 1 mm thick skin is achievable and results in minimal toxicity.
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Ethical standards statement
Institutional review board approval was obtained prior to opening this phase II trial, and therefore all research has been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. Informed consent was obtained from all patients before being included in the study.
Conflict of interest
The authors declare no conflict of interest related to this project.
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Nath, S.K., Chen, Z.J., Rowe, B.P. et al. A phase II trial of balloon-catheter partial breast brachytherapy optimization in the treatment of stage 0, I, and IIA breast carcinoma. J Radiat Oncol 3, 371–378 (2014). https://doi.org/10.1007/s13566-014-0153-8
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DOI: https://doi.org/10.1007/s13566-014-0153-8