Abstract
Although rare, uveal melanoma is the most common primary intraocular cancer. These tumors threaten eyesight and shorten life expectancy via treatment-refractory liver metastases. Radiation treatments represent the most used means of achieving local control. Among the varied means of delivering ionizing radiation, image-guided photon radiosurgery represents an accessible, effective and noninvasive alternative. It remains to be defined which patients are best suited to radiosurgery as compared to the more commonly prescribed plaque brachytherapy or proton beam therapy.
Despite the lack of prospective confirmation, it is assumed that local treatment can impact overall survival as radiotherapy arrests tumor growth, and the risk of metastasis is known to increase with tumor size. Although organ preservation is common, long-term visual acuity is disappointing as radiation retinopathy is common.
As image-guided radiosurgery systems assume a fixed relationship between targets and the skull, the main technical challenge in radiosurgery is to ensure a reproducible relationship between the eyeball and the cranium. In proton beam therapy, targeting is accomplished though the suturing of tantalum fiducials to the sclera, whereas in image-guided radiosurgery, the preference is for less invasive methods—retrobulbar anesthesia, closed-eye treatment, or patient-assisted gaze fixation systems.
Using a fractionation scheme of 50 Gy in 5 fractions for medium-sized tumors, the aim should be to exceed 90% in 5-year local control and 80% in 5-year enucleation-free survival.
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Roberge, D. (2020). Uveal Melanoma. In: Conti, A., Romanelli, P., Pantelis, E., Soltys, S., Cho, Y., Lim, M. (eds) CyberKnife NeuroRadiosurgery . Springer, Cham. https://doi.org/10.1007/978-3-030-50668-1_35
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