Abstract
The clinical heterogeneity of vitreous seeds can be distinguished into three classes (dust, spheres, and clouds). New evidence suggests that this classification system can be predictive of response to intravitreal melphalan.
Historically, intravitreal injections of chemotherapy have been avoided in retinoblastoma eyes, due to concerns regarding risk of extraocular dissemination. However, these fears have been allayed by a low reported incidence of spread along the needle tract. The low risk has been attributed to an evolution in the injection method and the implementation of safety enhancing techniques. Discussed here are the various methods that have been adopted and the rationale for their use.
While intravitreal injections have been deemed to be relatively safe, they are not without consequences to the eye. Summarized here are the clinical and preclinical findings of clinical toxicity and retinal toxicity as measured by electroretinogram (ERG). There is compelling evidence to suggest that each intravitreal injection of melphalan results in a measurable degradation in electroretinogram, and over the average injection course, this may result in up to a 30 % loss of normal retinal function as measured by ERG. While intravitreal injections of melphalan are now saving eyes that historically would have been lost to enucleation, there are still questions regarding the toxicity of this technique and how this correlates to visual function.
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Jasmine H. Francis declares that she has no conflict of interest.
All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (Memorial Sloan Kettering Cancer Center) and with the Helsinki Declaration of 1975, as revised in 2000. Informed consent was obtained from all patients for being included in the study. All institutional and national guidelines for the care and use of laboratory animals were followed.
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Francis, J.H. (2015). Vitreous Disease and the Technique, Safety and Toxicity of Intravitreal Chemotherapy for Retinoblastoma. In: Francis, J., Abramson, D. (eds) Recent Advances in Retinoblastoma Treatment. Essentials in Ophthalmology. Springer, Cham. https://doi.org/10.1007/978-3-319-19467-7_4
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DOI: https://doi.org/10.1007/978-3-319-19467-7_4
Publisher Name: Springer, Cham
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