Summary
This study is looking at whether adding a medicine called melphalan, given directly into the eye, can make early treatment more effective for children with retinoblastoma. Retinoblastoma is a cancer that starts in the retina - the part of the eye that helps us see.
Some children with retinoblastoma develop vitreous seeds, which are cancer cells floating in the jelly-like center of the eye. Those seeds can make the cancer harder to treat, and there is a higher chance the cancer may not respond well or may come back.
Researchers want to find out whether using melphalan together with standard chemotherapy at the start of treatment can better control these vitreous seeds.
This study uses cycles of chemotherapy and, for some patients, injections of melphalan into the eye. Treatment is given in stages, and doctors regualrly check how the eye is responding.
Cycles 1-2: Standard chemotherapy (CVE)
During the first two cycles (each cycle is 28 days long), patients receive three chemotherapy medicines:
- Carboplatin intravenously (IV) on Days 1 and 2
- Vincristine IV on Day 1
- Etoposide IV on Days 1 and 2
These medicines together are called the CVE regimen.
Patients have an eye exam under anesthesia (EUA) at the start of the study and before each cycle. An ultrasound of the eye (UBM) is done once before the first cycle. Urine samples are collected at the starts of the study and during treatment. Treatment continues for up to 2 cycles, as long as the cancer is not getting worse and side effects are manageable.
Cycle 3 onwards: Chemotherapy and possible melphalan
From cycle 3 onwards, patients continue receiving the same CVE chemotherapy as in Cycles 1 and 2.
Before each cycle, patients get an EUA to decide if melphalan can be safely given. If eligible, the patient receives one melphalan injection into the eye sometime between 14 days before to 14 days after the start of the cycle.
If a patient is not eligible in a given cycle, they simply continue CVE chemotherapy for that cycle. Treatment may continue for up to 4 cycles of CVE during thsi stage. Some patients may receive up to 6 melphalan injections total if the doctor believes they will benefit.
Uring samples will also be collected during these cycles. Patients also have MRI scans and may have small samples of eye fluid or tissue collected throughout the trial.
After treatment ends
When all study treatment is complete, patients return for follow-up:
- 4 weeks after finishing treatment
- Then every 3 months for 1 year
- Then every 3-6 months for years 2-5
These visits help doctors monitor the eye, check for any signs the cancer has returned, and watch for long-term effects.