Efficacy and Safety of an Indian Bevacizumab BIOSimilar (BEVATAS) for Retinal Vein Occlusion (BIOS-RVO Study)

Somnath Chakraborty,1 Jay Umed Sheth2 1Department of Vitreoretinal Services, Retina Institute of Bengal, Siliguri, India; 2Department of Vitreoretinal Services, Shantilal Shanghvi Eye Institute, Mumbai, Maharashtra, IndiaCorrespondence: Somnath Chakraborty, Department of Vitreoretinal Services, Retina Institute of Bengal, Siliguri, West Bengal, India, Email [email protected]: To evaluate the efficacy and safety of Bevatas®, an Indian bevacizumab biosimilar, in the management of both Central Retinal Vein Occlusion (CRVO) and Branch Retinal Vein Occlusion (BRVO) (BIOS-RVO).Patients and Methods: The BIOS-RVO study was a retrospective interventional study conducted at a single tertiary eye care facility in India. 154 treatment-naïve eyes with RVO (CRVO: 62 eyes; BRVO: 92 eyes) received intravitreal bevacizumab biosimilar (IVBb) therapy. Data on best-corrected visual acuity (BCVA), central macular thickness (CMT), and intraocular pressure (IOP) were collected at baseline and at 3, 6, and 12 months post-therapy.Results: The average age of participants was approximately 55.99 (+ 12.56) years, with a nearly equal gender distribution (M:F = 49.4:50.6). Age differences between BRVO and CRVO groups were not significant (P=0.501), but gender distribution varied significantly (P=0.035), with more males in the CRVO group. Significant improvements in BCVA were observed in both CRVO and BRVO groups at 3 months, 6 months, and 1 year compared to baseline (P< 0.001). Both groups showed significant reductions in CMT throughout the follow-up period (P< 0.001). The mean number of injections was higher in the CRVO group (5.27[± 1.45]) compared to the BRVO group (4.27 [± 1.28]) (P< 0.001). Significant IOP increases were observed at 1 month (P< 0.001) and 6 months (P< 0.001) in both BRVO and CRVO groups, although not clinically significant. Safety analysis revealed no additional ocular or systemic adverse events during the study period.Conclusion: The BIOS-RVO study demonstrates that Bevatas is an effective and safe treatment option for both CRVO and BRVO. These findings support the use of Bevatas as a cost-effective alternative to branded anti-VEGF agents, particularly in resource-limited settings.Keywords: retinal vein occlusion, bevacizumab, biosimilar, Bevatas