Retinoblastoma Treatment

Retinoblastoma is a disease in which malignant (cancer) cells form in the tissues of the retina.

The retina is made of nerve tissue that lines the inside wall of the back of the eye. It receives light and converts the light into signals that travel down the optic nerve to the brain. The brain decodes the signals so that you can see the image.

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Anatomy of the eye, showing the outside and inside of the eye including the sclera, cornea, iris, ciliary body, choroid, retina, vitreous humor, and optic nerve. The vitreous humor is a gel that fills the center of the eye.

Retinoblastoma may be in one eye (unilateral) or in both eyes (bilateral). Cavitary retinoblastoma is a rare type of retinoblastoma in which cavities (hollow spaces) form within the tumor.

Although retinoblastoma may occur at any age, it occurs most often in children younger than 2 years.

Children with a family history of retinoblastoma should have eye exams to check for retinoblastoma.

A child with a family history of retinoblastoma should have regular eye exams beginning early in life to check for retinoblastoma, unless it is known that the child does not have the RB1 gene change. Early diagnosis of retinoblastoma may mean the child will need less intense treatment.

Talk with your child’s doctor about the type of eye exam, how often eye exams are done, and at what age eye exams to check for retinoblastoma can stop.

Retinoblastoma occurs in heritable and nonheritable forms.

A child is thought to have the heritable (inherited) form of retinoblastoma when there is a certain mutation (change) in the RB1 gene. The mutation in the RB1 gene may be passed from the parent to the child, or it may occur in the egg or sperm before conception or soon after conception.

Other factors that suggest the child may have the heritable form of retinoblastoma include the following:

• There is a family history of retinoblastoma.
• There is more than one tumor in the eye.
• There is a tumor in both eyes.

After heritable retinoblastoma has been diagnosed and treated, new tumors may continue to form for a few years. Regular eye exams to check for new tumors are usually done every 2 to 4 months for at least 28 months.

Most cases of retinoblastoma are the nonheritable form. Nonheritable retinoblastoma is not passed down from parents. This type of retinoblastoma is caused by mutations in the RB1 gene that occur by chance after a child is born. Nonheritable retinoblastoma usually occurs in one eye.

A child who has heritable retinoblastoma has an increased risk of trilateral retinoblastoma and other cancers.

A child with heritable retinoblastoma has an increased risk of a pineal tumor in the brain. When retinoblastoma and a brain tumor occur at the same time, it is called trilateral retinoblastoma. The brain tumor is usually diagnosed between 20 and 36 months of age. Regular screening using MRI (magnetic resonance imaging) may be done for a child thought to have heritable retinoblastoma or for a child with retinoblastoma in one eye and a family history of the disease. CT (computerized tomography) scans are usually not used for routine screening in order to avoid exposing the child to ionizing radiation.

Heritable retinoblastoma also increases the child's risk of other types of cancer such as lung cancer, bladder cancer, or melanoma in later years. Regular follow-up exams are important.

Genetic testing can determine whether a child has the heritable or nonheritable form of retinoblastoma.

It is not always clear from the family medical history whether a condition is inherited. Certain families may benefit from genetic counseling and genetic testing. Genetic counselors and other specially trained health professionals can help parents understand the following:

• Their family medical history.
• Their options for RB1 gene testing.
• The risk of retinoblastoma for the child and the child's brothers or sisters.
• The risks and benefits of learning genetic information.

Genetic counselors can also help people cope with their genetic testing results, including how to discuss the results with family members.

Once it is known that the child has heritable retinoblastoma, other family members can be screened for the RB1 mutation. For one specific mutation, the risk of retinoblastoma in a sibling may depend partly on whether the mutation is inherited from the mother or from the father.

Signs and symptoms of retinoblastoma include "white pupil" and eyes that appear to be looking in different directions (crossed eyes).

These and other signs and symptoms may be caused by retinoblastoma or by other conditions. Check with a doctor if your child has any of the following:

• Pupil of the eye that appears white instead of red when light shines into it. This may be seen in flash photographs of the child.
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  Close-up photograph showing the eyes of a child with retinoblastoma. The pupil of the eye on the left side of the photo appears white compared to the pupil of the eye on the right side of the photo. A "white pupil" may be a sign of retinoblastoma.
  

• Eyes that appear to be looking in different directions (crossed eyes).
• Pain or redness in the eye.
• Infection around the eye.
• Eyeball that is larger than normal.
• Colored part of the eye and pupil look cloudy.

Tests that examine the retina are used to diagnose retinoblastoma.

The following tests and procedures may be used:

• Physical exam and health history: An exam of the body to check general signs of health, including checking for signs of disease, such as lumps or anything else that seems unusual. A history of the patient’s health habits and past illnesses and treatments will also be taken. The doctor will ask if there is a family history of retinoblastoma.
• Eye exam with dilated pupil: An exam of the eye in which the pupil is dilated (opened wider) with medicated eye drops to allow the doctor to look through the lens and pupil to the retina. The inside of the eye, including the retina and the optic nerve, is examined with a light. In young children, this exam may be done under anesthesia.

  There are several types of eye exams that are done with the pupil dilated:

  • Ophthalmoscopy: An exam of the inside of the back of the eye to check the retina and optic nerve using a small magnifying lens and a light.
  • Fluorescein angiography: A procedure to look at blood vessels and the flow of blood inside the eye. An orange fluorescent dye called fluorescein is injected into a blood vessel in the arm and goes into the bloodstream. As the dye travels through blood vessels of the eye, a special camera takes pictures of the retina and choroid to find any blood vessels that are blocked or leaking.
  • Electroretinography: An eye test that uses light and small electrodes to study the retina (the light-detecting part of the eye). This test measures and records the faint electrical signals given off by the cells in the retina when exposed to different types and amounts of light. It can be used to assess the function of the retina during and after treatment.
• RB1 gene test: A laboratory test in which a sample of blood or tissue is tested for a change in the RB1 gene.
• Ultrasound exam of the eye: A procedure in which high-energy sound waves (ultrasound) are bounced off the internal tissues of the eye to make echoes. Eye drops are used to numb the eye and a small probe that sends and receives sound waves is placed gently on the surface of the eye. The echoes make a picture of the inside of the eye and the distance from the cornea to the retina is measured. The picture, called a sonogram, shows on the screen of the ultrasound monitor. The picture can be printed to be looked at later.
• MRI (magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body, such as the eye. This procedure is also called nuclear magnetic resonance imaging (NMRI).

Retinoblastoma can usually be diagnosed without a biopsy.

When retinoblastoma is in one eye, it sometimes forms in the other eye. Exams of the unaffected eye are done until it is known that the retinoblastoma is the nonheritable form.

Certain factors affect prognosis (chance of recovery) and treatment options.

The prognosis and treatment options depend on the following:

• Whether the cancer is in one or both eyes.
• The size and number of tumors.
• Whether the tumor has spread to the area around the eye, to the brain, or to other parts of the body.
• The age of the child.
• How likely it is that vision can be saved in one or both eyes.
• Whether a second type of cancer has formed.
• Whether the cancer is newly diagnosed or has recurred (come back).

After retinoblastoma has been diagnosed, tests are done to find out if cancer cells have spread within the eye or to other parts of the body.

The process used to find out if cancer has spread within the eye or to other parts of the body is called staging. The information gathered from the staging process determines whether retinoblastoma is only in the eye (intraocular) or has spread outside the eye (extraocular). It is important to know the stage in order to plan treatment. The results of the tests and procedures used to diagnose cancer are often also used to stage the disease.

The following tests and procedures may be used in the staging process:

• MRI (magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body, such as the brain. This procedure is also called nuclear magnetic resonance imaging (NMRI).
• Bone scan: A procedure to check if there are rapidly dividing cells, such as cancer cells, in the bone. A very small amount of radioactive material is injected into a vein and travels through the bloodstream. The radioactive material collects in the bones with cancer and is detected by a scanner that also takes a picture of the body. Areas of bone with cancer show up brighter in the picture because they take up more radioactive material than normal bone cells do.
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  Bone scan. A small amount of radioactive material is injected into the child's vein and travels through the blood. The radioactive material collects in the bones. As the child lies on a table that slides under the scanner, the radioactive material is detected and images are made on a computer screen.
  

• Bone marrow aspiration and biopsy: The removal of bone marrow and a small piece of bone by inserting a hollow needle into the hipbone or breastbone. A pathologist views the bone marrow under a microscope to look for signs of cancer. A bone marrow aspiration and biopsy is done if the doctor thinks the cancer has spread outside of the eye.
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  Bone marrow aspiration and biopsy. After a small area of skin is numbed, a bone marrow needle is inserted into the child’s hip bone. Samples of blood, bone, and bone marrow are removed for examination under a microscope.
  

• Lumbar puncture: A procedure used to collect cerebrospinal fluid (CSF) from the spinal column. This is done by placing a needle between two bones in the spine and into the CSF around the spinal cord and removing a sample of the fluid. The sample of CSF is checked under a microscope for signs that the cancer has spread to the brain and spinal cord and sometimes it is also checked for a tumor marker called ganglioside GD2. This procedure is also called an LP or spinal tap.

The International Retinoblastoma Staging System (IRSS) may be used for staging retinoblastoma.

There are several staging systems for retinoblastoma. The IRSS stages are based on how much cancer remains after surgery to remove the tumor and whether the cancer has spread.

There are three ways that cancer spreads in the body.

Cancer can spread through tissue, the lymph system, and the blood:

• Tissue. The cancer spreads from where it began by growing into nearby areas.
• Lymph system. The cancer spreads from where it began by getting into the lymph system. The cancer travels through the lymph vessels to other parts of the body.
• Blood. The cancer spreads from where it began by getting into the blood. The cancer travels through the blood vessels to other parts of the body.

Cancer may spread from where it began to other parts of the body.

When cancer spreads to another part of the body, it is called metastasis. Cancer cells break away from where they began (the primary tumor) and travel through the lymph system or blood.

• Lymph system. The cancer gets into the lymph system, travels through the lymph vessels, and forms a tumor (metastatic tumor) in another part of the body.
• Blood. The cancer gets into the blood, travels through the blood vessels, and forms a tumor (metastatic tumor) in another part of the body.

The metastatic tumor is the same type of cancer as the primary tumor. For example, if retinoblastoma spreads to the bone, the cancer cells in the bone are actually retinoblastoma cells. The disease is metastatic retinoblastoma, not bone cancer.

Treatment for retinoblastoma depends on whether it is intraocular (within the eye) or extraocular (outside the eye).

Treatment for retinoblastoma also depends on whether the cancer has progressed or recurred.

Progressive retinoblastoma is cancer that continues to grow, spread or get worse. Progressive disease may be a sign that the cancer has become refractory to treatment.

Recurrent retinoblastoma is cancer that has recurred (come back) after it has been treated. The cancer may recur in the eye, in tissues around the eye, or in other places in the body, such as the liver, bone, bone marrow, or lymph nodes.

There are different types of treatment for patients with retinoblastoma.

Different types of treatment are available for patients with retinoblastoma. Some treatments are standard (the currently used treatment), and some are being tested in clinical trials. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients with cancer. When clinical trials show that a new treatment is better than the standard treatment, the new treatment may become the standard treatment.

Because cancer in children is rare, taking part in a clinical trial should be considered. Some clinical trials are open only to patients who have not started treatment.

Children with retinoblastoma should have their treatment planned by a team of health care providers who are experts in treating cancer in children.

The goals of treatment are to save the child's life, to save vision and the eye, and to prevent serious side effects. Treatment will be overseen by a pediatric oncologist, a doctor who specializes in treating children with cancer. The pediatric oncologist works with other health care providers who are experts in treating children with eye cancer and who specialize in certain areas of medicine. These may include a pediatric ophthalmologist (children's eye doctor) who has a lot of experience in treating retinoblastoma and the following specialists:

• Pediatric surgeon.
• Radiation oncologist.
• Pediatrician.
• Pediatric nurse specialist.
• Rehabilitation specialist.
• Social worker.
• Geneticist or genetic counselor.

Six types of standard treatment are used:

New types of treatment are being tested in clinical trials.

This summary section describes treatments that are being studied in clinical trials. It may not mention every new treatment being studied. Information about clinical trials is available from the NCI website.

Treatment for retinoblastoma may cause side effects.

To learn more about side effects that begin during treatment for cancer, visit Side Effects.

Side effects from cancer treatment that begin after treatment and continue for months or years are called late effects. Late effects of treatment for retinoblastoma may include the following:

• Physical problems such as seeing or hearing problems.
• If the eye is removed, there may be changes in the shape and size of the bone around the eye until an artificial eye is fitted. This is most likely to occur in children aged younger than 3 years.
• Changes in mood, feelings, thinking, learning, or memory.
• Second cancers (new types of cancer), such as lung and bladder cancers, osteosarcoma, soft tissue sarcoma, or melanoma.

The following risk factors may increase the risk of having a second cancer:

• Having the heritable form of retinoblastoma.
• Past treatment with radiation therapy, especially before age 1 year.
• Having already had a previous second cancer.

It is important to talk with your child's doctors about the effects cancer treatment can have on your child. Regular follow-up by health professionals who are experts in diagnosing and treating late effects is important. See the PDQ summary on Late Effects of Treatment for Childhood Cancer for more information.

Patients may want to think about taking part in a clinical trial.

For some patients, taking part in a clinical trial may be the best treatment choice. Clinical trials are part of the cancer research process. Clinical trials are done to find out if new cancer treatments are safe and effective or better than the standard treatment.

Many of today's standard treatments for cancer are based on earlier clinical trials. Patients who take part in a clinical trial may receive the standard treatment or be among the first to receive a new treatment.

Patients who take part in clinical trials also help improve the way cancer will be treated in the future. Even when clinical trials do not lead to effective new treatments, they often answer important questions and help move research forward.

Patients can enter clinical trials before, during, or after starting their cancer treatment.

Some clinical trials only include patients who have not yet received treatment. Other trials test treatments for patients whose cancer has not gotten better. There are also clinical trials that test new ways to stop cancer from recurring (coming back) or reduce the side effects of cancer treatment.

Clinical trials are taking place in many parts of the country. Information about clinical trials supported by NCI can be found on NCI’s clinical trials search webpage. Clinical trials supported by other organizations can be found on the ClinicalTrials.gov website.

Follow-up tests may be needed.

As your child goes through treatment, they will have follow-up tests or check-ups. Some tests that were done to diagnose or stage the cancer may be repeated to see how well the treatment is working. Decisions about whether to continue, change, or stop treatment may be based on the results of these tests.

Some of the tests will continue to be done from time to time after treatment has ended. The results of these tests can show if your child's condition has changed or if the cancer has recurred (come back).

In retinoblastoma, new tumors may form for a few years after treatment. Regular eye exams are done to check for tumors in both eyes. Children with the heritable form of retinoblastoma will also have imaging tests to check whether cancer has spread to the brain.

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This PDQ cancer information summary has current information about the treatment of retinoblastoma. It is meant to inform and help patients, families, and caregivers. It does not give formal guidelines or recommendations for making decisions about health care.

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PDQ® Pediatric Treatment Editorial Board. PDQ Retinoblastoma Treatment. Bethesda, MD: National Cancer Institute. Updated <MM/DD/YYYY>. Available at: https://www.cancer.gov/types/retinoblastoma/patient/retinoblastoma-treatment-pdq. Accessed <MM/DD/YYYY>. [PMID: 26389197]

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