Targeting NUDT21 siRNA Drugs for Patients With Refractory Retinoblastoma

NCT ID: NCT06424301

Last Updated: 2025-06-26

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: EARLY_PHASE1
• Total Enrollment: 2 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2024-12-20
• Study Completion Date: 2025-09-30

Brief Summary

Retinoblastoma (RB) is the most common intraocular malignancy in children, accounting for approximately 11% of all cancers diagnosed in children under the age of one. Although its incidence is relatively low-about 1 in 15,000 to 20,000 live births-RB has a high risk of intracranial metastasis via the optic nerve, often leading to poor prognosis in advanced cases.

Recent advances in administration routes, such as intravitreal and intra-arterial chemotherapy, have significantly improved eye preservation rates. However, these strategies are limited by cumulative retinal toxicity and drug resistance. In refractory cases, enucleation remains the only definitive treatment to prevent extraocular spread and death.

In light of these challenges, current research efforts are focused on developing novel targeted therapies that enhance anti-tumor efficacy while minimizing local toxicity. In this context, we introduce a first-in-class siRNA-based drug targeting NUDT21, which promotes tumor regression by modulating the 3'UTR tail of SMC1A, thereby suppressing tumor cell proliferation. Importantly, the siRNA drug selectively targets tumor cells, offering a favorable safety profile compared to conventional chemotherapeutic regimens.

Given that both the target (NUDT21) and the mode of administration (intraocular siRNA injection) are novel in retinoblastoma treatment, there is an urgent need for early-phase investigator-initiated clinical research. This study is therefore designed to assess the short-term safety and preliminary efficacy of NUDT21 siRNA in patients with refractory retinoblastoma, and to provide an evidence base for future large-scale clinical trials.

Conditions

Retinoblastoma; Refractory

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

Intravitreal chemotherapy in patients with refractory retinoblastoma

Prior to the first administration of the targeted drug, enrolled patients underwent peripheral blood sampling and comprehensive clinical evaluation. Intravitreal injections of the targeted drug were administered at a dosage of 100-200 μg (100 μg for patients under 2 years of age; 200 μg for patients aged 2 years and above) on Day 1 of Weeks 1, 3, and 7. Aqueous humor samples were collected at the time of injection during Weeks 1, 3, and 7. Clinical assessments were conducted monthly, with continuous follow-up extending through Week 24.

Group Type: EXPERIMENTAL

Targeting NUDT21 siRNA drugs

Intervention Type: DRUG

It is performed for intravitreal chemotherapy.

Interventions

Targeting NUDT21 siRNA drugs

It is performed for intravitreal chemotherapy.

Intervention Type: DRUG

Eligibility Criteria

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.

• Minimum Eligible Age: 6 Months
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

The Eye Hospital of Wenzhou Medical University

OTHER

Sponsor Role: collaborator

Eye & ENT Hospital of Fudan University

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Chen Zhao, MD

Role: PRINCIPAL_INVESTIGATOR

Fudan Eye & ENT Hospital

Kang Xue, MD

Role: STUDY_DIRECTOR

Fudan Eye & ENT Hospital

Kang Zhang, MD

Role: STUDY_DIRECTOR

The Eye Hospital of Wenzhou Medical University

Jiang Qian, MD

Role: STUDY_DIRECTOR

Fudan Eye & ENT Hospital

Locations

Fudan Eye & ENT Hospital

Shanghai, , China

Site Status: RECRUITING

Countries

China

Central Contacts

Chen Zhao, MD

Role: CONTACT

dr_zhaochen@fudan.edu.cn

86-021-64377134

Ruiqi Ma, MD

Role: CONTACT

ruiqi_ma@fudan.edu.cn

Facility Contacts

Ruiqi Ma

Role: primary

ruiqi_ma@fudan.edu.cn

+86 (021) 64377134

Other Identifiers

FDEENT-20241031

Identifier Type: -

Identifier Source: org_study_id