Targeting NUDT21 siRNA Drugs for Patients With Refractory Retinoblastoma

Inclusion Criteria: 1. Patients with retinoblastoma with a somatic mutation of the gene RB1 and active tumor in a single eye, or germinal mutation of RB1 with active tumor/s in an eye and the contralateral eye unaffected, enucleated or without tumor activity. In both cases, relapsed or refractory with the use of systemic, intraarterial or intravitreal chemotherapy or radiotherapy, in accordance with the availability at his/her referral site, in whom enucleation is the only recommended treatment under opinion of the medical team treating the case at the originating referral site. But the patient has a strong desire to preserve the eye. 2. Normal renal function: serum creatinine: \< 45 μmol/L (0-2 years); \< 57 μmol/L (3-6 years); \< 60 μmol/L (7-10 years); \< 80 μmol/L (11-13 years). 3. Normal Hepatic function: serum ALT: \< 0,52 μkat/L (de 9 months -12 years); serum AST: 61-80 g/L (8 months - 5 years); 63-83 g/L (5-9 years); 63-82 g/L (9-12 years). 4. Age greater than 6 months at the time of inclusion in the study. 5. Sign the informed consent form and be willing to follow up at the specified time. Exclusion Criteria: 1. Presence of factors that require immediate enucleation of the affected eye such as glaucoma, rubeosis iridis, anterior chamber involvement. 2. Comorbidities: Uncontrolled epilepsy with anticonvulsant treatment, cardiac disease not compensated by treatment. 3. Active Infections. 4. Other chronic or active acute diseases that under the criterion of the researcher were an exclusion criterion. 5. History of having received attenuated or live vaccines in the 30 days prior to inclusion in the study. 6. Any cause of Immunosuppression. 7. Trilateral Retinoblastoma. 8. Extraocular spread. 9. History of having received treatment for retinoblastoma with chemotherapy or radiation therapy by any means within 30 days prior to inclusion in the study. 10. Patients who can not complete the study procedures.