Intra-arterial chemotherapy for retinoblastoma treatment in Chile: Experience and results 2013-2020.

Objective: To establish the success rate of salvage intra-arterial chemotherapy (IAC), defined as the percentage of eyes that achieved tumoral remission and avoided enucleation. The second objective was the clinical characterization, catheterization results, and associated local and systemic complications.

Methods: Retrospective, interventional case series of 29 patients (35 eyes) with persistent or recurrent retinoblastoma.

Results: A total of 73 salvage IAC procedures with topotecan and melphalan were carried out. Success rate was 77% at a mean follow-up of 41.4 months. All patients with only one remaining eye avoided enucleation (10 cases). Catheterization was successful in 98.6% of cases. The types of catheterizations were as follows: 71.2% supraselective ophthalmic artery, 12.3% occlusion pump assisted supraselective ophthalmic artery, 16.4% selective external carotid with retrograde flow. 14% of patients suffered local adverse effects: 1 (2.8%) transitory ptosis, 1 (2.8%) transitory oculomotor nerve palsy, 2 (5.7%) aseptic cellulitis and 1 (2.8%) periorbitary pigmentation. 4.1% (3 cases) suffered neutropenia due to medullar chemosuppression. There were no cases of severe anemia or thrombocytopenia. There were no cerebral ischemic events or mortality associated to the procedure.

Conclusion: IAC with melphalan and topotecan is a safe and effective treatment option for persistent or recurrent retinoblastoma, able to reduce enucleation rates.