What causes retinoblastoma?
Our eyes begin to develop very early in the womb. Rapidly growing cells in the eye, called retinoblasts, will eventually mature and form the retina. Sometimes, these specialized cells do not stop reproducing and form a tumor on the retina. These tumors might continue to grow, filling almost the entire vitreous humor (the jelly-like substances that fills the eyeball), but also break off and spread to other parts of the eye, and eventually outside to lymph nodes and other organs.
Who gets retinoblastoma?
Retinoblastoma occurs most often in children 5 years old and younger. It rarely occurs in adults. Between 200 and 300 children are diagnosed with retinoblastoma each year, affecting one in every 20,000 newborns. About 40 percent of all cases of retinoblastoma are inherited, meaning the cancer is passed on from parent to child. Retinoblastoma occurs about 75 percent of the time in one eye, and 25 percent of the time in both eyes.
What are the symptoms of Retinoblastoma?
Symptoms of retinoblastoma include:
- A pupil that appears white when light is shone into it, called leucocoria, might mean that a retinal tumor is present. Blood vessels in the back of the eye will normally reflect red.
- The eyes might not move or focus in the same direction.
- There might be eye pain.
- The pupil is constantly dilated.
- The eye(s) might be red.
How is retinoblastoma diagnosed?
An eye exam and imaging test given by an ophthalmologist (an eye doctor) can diagnose the condition.
If retinoblastoma is suspected, the child is usually referred to an ophthalmologist with interest and expertise in this condition. The ophthalmologist will need to examine the eye using special equipment to see the retina. Other tests might be conducted to determine the stage of the retinoblastoma, or how far it has spread. These tests, often coordinated by a collaborating pediatric oncologist, may include ultrasound, MRI scans, CT scans, bone scans, spinal tap, and bone marrow tests.
What are the stages of retinoblastoma?
Stages of retinoblastoma include:
- Intraocular retinoblastoma — This is the earliest stage of retinoblastoma, found in one or both eyes. It has not yet spread to tissue outside of the eye.
- Extraocular retinoblastoma — This type of cancer has spread outside of the eye or to other parts of the body.
- Recurrent retinoblastoma — The cancer has come back or spread in the eye or to other parts of the body after being treated.
How is retinoblastoma treated?
Because it is usually found before it spreads outside of the sclera (white of the eye), retinoblastoma is highly curable, and there are many types of treatment that can also save eyesight. Treatments are selected based on the stage of cancer at the time of diagnosis. Options include:
- Photocoagulation — A laser is used to kill blood vessels that feed the tumor.
- Cryotherapy — Extremely low temperatures are used to kill cancer cells.
- Chemotherapy — Chemotherapy is a treatment given intravenously (injected into the vein), orally (by mouth), or is injected into the eye or the fluid that surrounds the brain and spinal cord (called intrathecal chemotherapy). These powerful doses of cancer-killing medicine help kill or slow the growth of multiplying cancerous cells.
- Radiation therapy — Radiation might be given externally or internally. External-beam radiation therapy uses X-rays to kill cancer cells. Internal, or local radiation therapy, involves placing small amounts of radioactive material inside of or near the tumor to kill cancer cells.
- Enucleation — This is surgery to remove the eye.
What does the future hold for people with retinoblastoma?
More than 90 percent of children will survive more than five years after being diagnosed with retinoblastoma. After eye-saving treatment, the amount of vision that is left in the affected eye is highly variable, depending on the size and location of the tumor(s).
Patients with hereditary forms of retinoblastoma are more likely to develop other cancers over time. Therefore, close follow-up after treatment is important for these patients.
Is retinoblastoma preventable?
Because heredity and age play such large roles in retinoblastoma, the best way to prevent vision loss is through early detection. All babies with a family history of retinoblastoma should have a general eye exam at birth and then again as directed by the consulting specialists. A doctor will be able to detect any serious congenital (present at birth) problems or the appearance of retinal tumors. The chance that a parent with heritable (genetic) retinoblastoma will pass on to his or her child the DNA mutation that causes this cancer is 1 in 2. Sophisticated testing in some situations can be used to determine if this mutation is present.
For adults, prevention of avoidable vision loss is assisted by getting a thorough regular eye examination at least once a year, and more often — as recommended by your ophthalmologist — if you have a personal or family history of eye disorders or diabetes.
- National Cancer Institute: General Information about Retinoblastoma
- Genetics Home Reference: Retinoblastoma
- American Cancer Society: What is retinoblastoma?
© Copyright 1995-2017 The Cleveland Clinic Foundation. All rights reserved.
This information is provided by the Cleveland Clinic and is not intended to replace the medical advice of your doctor or health care provider. Please consult your health care provider for advice about a specific medical condition. This document was last reviewed on: 3/23/2015...#10706