Genetic Risk Factors for Radiation Vasculopathy

Area of Science:

• Ophthalmology
• Genetics
• Oncology

Background:

• Proton beam irradiation is a treatment for choroidal melanoma.
• Radiation complications can lead to vision loss.
• Identifying factors influencing vision loss is crucial for patient outcomes.

Purpose of the Study:

• To conduct a genome-wide scan for genetic polymorphisms associated with vision loss after proton beam irradiation for choroidal melanoma.
• To identify genetic markers that predict the risk of radiation-induced vision loss.

Main Methods:

• A cohort of 126 patients with choroidal melanoma treated with proton beam irradiation was analyzed.
• Patients were classified as cases (severe vision loss) or controls (good vision) 3 years post-treatment.
• Genome-wide genotyping was performed using the Omni 2.5 chip.

Main Results:

• Hypertension, poorer visual acuity at diagnosis, and tumor proximity to the fovea/optic disc were associated with vision loss.
• While 74,529 single nucleotide polymorphisms (SNPs) were nominally significant, none reached genome-wide significance.
• The most significant SNP, rs11678387, was identified on chromosome 2.

Conclusions:

• Vision loss after proton beam irradiation for choroidal melanoma is influenced by factors beyond tumor location, including hypertension.
• Genetic factors may also play a role in the development of radiation-induced vision loss.
• Further research is needed to elucidate the genetic underpinnings of radiation complications.