Abstract
PurposeThere is very little information detailing outcomes and toxicity following re-irradiation for ultracentrally located thoracic tumors, and detailed dosimetric data is non-existent. This data is critical for the safe management of these extremely difficult cases. Materials and MethodsThe records of fifteen individuals undergoing 10-fraction hypofractionated stereotactic body radiotherapy (hfSBRT) for the management of ultracentrally located thoracic tumors between 2009 and 2020 at a single institution were retrospectively reviewed. Treatment outcomes and toxicity were analyzed. A detailed dosimetric analysis of treatment plans and centrally located organs at risk (OARs), from the initial, re-irradiation, and cumulative radiotherapy courses was presented. ResultsAt a median follow up of 10 months, one- and three-year overall survival (OS), progression free survival (PFS) and local control (LC) were 52% and 28%, 33% and 28%, and 76% and 61%, respectively. Treatment related adverse events were low with 5 individuals (33%) developing ≥ grade 2 pneumonitis (Grade 2 = 4, Grade 3 = 1). Dosimetric parameters were not associated with the development of clinically relevant pneumonitis. No adverse events involving central OARs (esophagus, great vessels, primary bronchial tree) were identified. Median cumulative mean lung dose (MLD) was 24 Gy (EQD2) (range: 10-33 Gy), with a V20 of 33% (range: 11-51%). Median esophageal, primary bronchial tree, and great vessel maximum doses (Dmax) were 93.2 Gy (EQD2) (range: 50-148 Gy), 163 Gy (range: 77-204 Gy), and 191 Gy (range: 129-262 Gy), respectively. ConclusionsThe current investigation is the first to provide detailed cumulative dosimetric data from a cohort of patients comprised entirely of ultracentrally located thoracic tumors. Despite unfavorable anatomic tumor location given an intimate association to critical OARs, delivering an ablative dose with a 10-fraction hfSBRT course can serve as a feasible option for these challenging cases.
Published Version
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