Author:
Gigliotti Carmen Rosaria,Modorati Giulio,Di Nicola Maura,Fiorino Claudio,Perna Lucia Alessia,Miserocchi Elisabetta,Franzin Alberto,Picozzi Piero,Bolognesi Angelo,Mortini Pietro,del Vecchio Antonella,Calandrino Riccardo
Abstract
AimsThe aim of the present work is to assess the main predictors of the most clinically relevant radio-induced effects after Gamma Knife stereotactic radiosurgery (GKRS) for uveal melanoma (UM).Materials and methodsMedical records and three-dimensional dosimetry data of critical structures of 66 patients were retrospectively reviewed. Cox’s proportional hazard model was used to identify clinical and dosimetric variables as independent risk factor for GKRS-related complications.ResultsThe fraction of the posterior segment receiving more than 20Gy (V20), Bruch’s membrane rupture and tumour thickness were significant prognostic factors for neovascular glaucoma. A clear relationship with the dose received by 1% of the optic nerve (D1%) was found for radiation retinopathy and papillopathy. Multivariables models resulted for visual acuity (VA) reduction >20% of the basal value and for complete VA loss, both including largest tumour diameter and D1% to the optic nerve. The predictive model for complete VA loss includes also Bruch’s membrane rupture. An alternative model for complete visual acuity loss, including the optic nerve-prescription isodose minimum distance, was also suggested.ConclusionsWe found clinical and dosimetric variables to clearly predict the risk of the main side effects after GKRS for UM. These results may provide dose constraints to critical structures, potentially able to reduce side effects. Constraining D1% to the optic nerve below 12-13Gy may result in a dramatic reduction of blindness risk, while reducing V20 of the posterior segment of the bulb could limit the neovascular glaucoma onset.
Subject
Cellular and Molecular Neuroscience,Sensory Systems,Ophthalmology
Cited by
18 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献