Risk Factors and Preventive Effects of Laser Panretinal Photocoagulation for Neovascular Glaucoma after Ophthalmic Stereotactic Radiotherapy.

: Purpose: To evaluate the risk factors and the preventive effects of laser panretinal photocoagulation (PRP) for neovascular glaucoma (NVG) after ophthalmic stereotactic radiotherapy. Methods: Twenty-four patients with ocular malignant tumor (such as uveal malignant melanoma, lacrimal gland cancer) who received stereotactic radiotherapy (such as gamma knife, cyber knife) were retrospectively analyzed. Patients were divided into group A without preventive PRP (n=9), and group B with preventive PRP (n=15). Survival curves were plotted using the Kaplan-Meier method and compared between the two groups with the log-rank test. Results: In group A, NVG occurred in 3 patients. In contrast, in group B, no patient encountered NVG. The significant risk factor for NVG was dose-volumes that irradiated the optic disk (p=0.045). The incidence of NVG was significantly reduced in group B compared with group A (p=0.019). Conclusions: Dose-volumes that irradiated the optic disk were risk factors for NVG. PRP is effective in the prevention of NVG.