Purpose: To investigate on the safety and efficacy of intravitreous chemotherapy for retinoblastoma seeding in a relatively large cohort and provide information on the necessary number of injections and long-term control.
Methods: Retrospective interventional case series of 40 consecutive eyes with viable vitreous seeding after standard treatment of retinoblastoma. All eyes received intravitreal melphalan injection (20-30 μg) and additional topotecan (20 μg) as needed using the trans pars plana route with triple freeze-thaw cryotherapy at needle withdrawal for prevention of extraocular seeding for planned six cycles.