Retinoblastoma in children
Retinoblastoma is an uncommon type of eye cancer in children. This information describes retinoblastoma, its symptoms, diagnosis and treatment.
More children than ever are surviving childhood cancer. There are new and better drugs and treatments. But it remains devastating to hear that your child has cancer, and at times it can feel overwhelming. There are many healthcare professionals and support organisations to help you through this difficult time.
Understanding more about the cancer your child has and the treatments that may be used can often help parents to cope. We hope you find the information here helpful. Your child's specialist will give you more detailed information. If you have any questions it’s important to ask the specialist doctor or nurse who knows your child’s individual situation.
We hope this information answers your questions. If you have any further questions, you can ask a nurse or doctor involved in your child's treatment.
Retinoblastoma is an uncommon eye cancer that usually affects children under five, although it can affect children of any age. About 80 cases of retinoblastoma are diagnosed in the UK each year. Treatment is very effective and nearly all (98 out of 100) children with retinoblastoma are cured.
Retinoblastoma develops in the light-sensitive lining of the eye (called the retina).
There are two forms of retinoblastoma:
- A heritable form - this is genetic or inherited. There are often tumours in both eyes (bilateral) or sometimes only in one eye.
- A non-heritable form - this is not passed on in the family. There's one tumour in only one eye (unilateral).
Causes of retinoblastomaBack to top
The heritable form of retinoblastoma, which accounts for about two in every five cases, is caused by a genetic abnormality. This means that an abnormal gene allows the tumour to develop. This abnormal gene may either be inherited from a parent or happen for the first time at an early stage of development in the womb.
Genetic counselling and support is available for families in which a member has retinoblastoma. Not all children of a parent with retinoblastoma will inherit this gene, but children born into families with a history of retinoblastoma are offered blood testing. They are also usually checked (screened) soon after birth for signs of retinoblastoma. This means that treatment can be started early if a tumour does develop.
Screening usually starts shortly after birth and is repeated every few months for five years. An eye specialist examines the eye, while shining a light into it with an opthalmoscope.
The genetic abnormality in the heritable form of retinoblastoma is now well-understood. But we don’t know what causes non-heritable retinoblastoma.
Signs and symptoms of retinoblastomasBack to top
Some children with a family history of retinoblastoma are picked up by screening before they have any symptoms.
If there's no family history of retinoblastoma, the first sign of the condition is often a white pupil that does not reflect light (leucocoria). This may be picked up on when a picture of your child is taken using flash photography. The pupil of the affected eye may look white in the photograph.
Some children may have a squint or, if the tumour is large, they may have a painful red eye.
How a retinoblastoma is diagnosedBack to top
Tests are likely to involve an examination under anaesthetic (EUA) where an eye specialist (ophthalmologist) examines your child’s eye while they're asleep. Unlike nearly all other types of cancer, retinoblastomas can be diagnosed just by their appearance. So it’s not usually necessary to take a sample of tissue (a biopsy). Your child will have several more EUAs to check how treatment is progressing.
When a retinoblastoma is diagnosed, your child may have some other tests to check the exact position and size of the tumour, and whether it has begun to spread into surrounding structures. This is known as staging.
They may have some of the following tests:
- An ultrasound scan. This is a painless scan that uses sound waves to examine the eye and the surrounding area.
- An MRI (magnetic resonance imaging) scan. This uses magnetism to build up a detailed picture of the eye and the head.
- A lumbar puncture. The doctor inserts a fine needle between the bones in the lower spine to remove a sample of the fluid from around the brain and spinal cord (cerebrospinal fluid). The fluid is examined under a microscope to check whether there are any cancer cells present.
- A bone marrow sample. This may be taken to check whether there are any cancer cells in the bone marrow (where our blood cells are made). The doctor inserts a needle into the hip bone and draws some of the bone marrow out with a syringe so that it can be checked for any cancer cells.
- A bone scan. This involves taking a series of x-rays to check for signs of any spread to the bones.
- A blood test. This may be taken for genetic testing for the Rb gene. The results of this test can take some months.
The doctor or a specialist nurse will explain more about the tests that your child needs.
Staging of retinoblastomaBack to top
The stage of a cancer is a term used to describe its size and whether it has spread from where it first started. Knowing the stage of your child’s retinoblastoma helps the doctors to decide on the most appropriate treatment.
The following staging system is commonly used for retinoblastoma:
There is cancer in one or both eyes, but it has not spread to other parts of the eye or the tissues surrounding the eye. This stage may be sub-divided into five grades (A–E), depending on the size and position of the cancer and on whether there’s any damage to the eye.
The cancer has spread outside the eye into surrounding tissue, or to other parts of the body.
Treatment for retinoblastomaBack to top
This depends on the number, position and size of the tumours in the eye. The aim of treatment is firstly to get rid of the cancer and secondly to try to keep the sight in the eye. Some treatments may cause changes to the vision in the affected eye. Your child’s specialist will talk to you about the possible risks as well as the advantages of the treatment.
For smaller tumours, treatment is given to the eye itself (called local therapy), while your child is asleep and under anaesthetic. One of the following methods may be used:
This is used to freeze the tumours. More than one session may be necessary, in which case they are usually done at monthly intervals.
A laser is used to heat the tumour. Your child may need a number of sessions at intervals of 3-4 weeks.
A small radioactive disc is stitched over the tumour on the outside of the eye. The disc needs to stay in place for up to four days while the radiation destroys the cancer cells. This is done for slightly larger tumours, or tumours that have not been successfully treated with other methods.
This process uses heat to destroy the cancer cells and may be combined with chemotherapy or radiotherapy, as heat can improve the effectiveness of these treatments. The heat is produced by a laser, which is directed at the tumour.
These can be treated in a number of ways, including:
This is the use of anti-cancer (cytotoxic) drugs to destroy cancer cells. It may be given before the local treatments mentioned above, to help shrink the tumour and make treatment more successful. Chemotherapy can also be used if the cancer has spread to other parts of the body, or if there’s a risk that it may spread. The chemotherapy drugs most commonly used to treat retinoblastoma are carboplatin, etoposide and vincristine.
A new approach in some situations is to give chemotherapy directly into the artery (the blood vessel) that supplies the affected eye. This is called intra-arterial chemotherapy (IAC). It is not commonly used and tends to be reserved for tumours that haven't responded well to the standard treatment or if a tumour comes back.
If the tumour is very large and the vision in the eye is lost, your child is likely to need an operation to remove the eye. The specialist will only do this if it is absolutely necessary. An artificial eye is then fitted.
Radiotherapy treats cancer by using high energy rays from a machine to destroy the cancer cells, while doing as little harm as possible to normal cells. It can be given to the whole eye but does have some effect on the surrounding tissue. Radiotherapy for retinoblastoma is normally only used when other treatments have not worked well.
Side effects of treatmentBack to top
The side effects will depend on the treatment your child is having. The immediate side effects will usually improve when treatment finishes. But unfortunately some treatments may cause side effects that develop many years later. The specialist will explain all of this to you before treatment starts, and your child’s follow-up will include checking for any long-term effects of treatment.
Many children have their treatment as part of a clinical research trial. Trials aim to improve our understanding of the best way to treat an illness, usually by comparing the standard treatment with a new or modified version. Specialist doctors carry out trials for children's cancers.
If appropriate, your child's medical team will talk to you about taking part in a clinical trial, and will answer any questions you have. Written information is provided to help explain things.
Taking part in a research trial is completely voluntary, and you'll be given plenty of time to decide whether it's right for your child.
Follow-up for retinoblastomaBack to top
At least 9 out of every 10 children with retinoblastoma are cured. Following treatment, the eye specialist will frequently examine your child’s eye under anaesthetic to check that the retina is healthy, the cancer has not come back, and no new tumours have developed. Follow-up is usually in a clinic for childhood cancers, called a paediatric oncology clinic.
Children with heritable retinoblastoma will be given genetic counselling when they are old enough to understand it.
Having the heritable form of retinoblastoma means an increased risk of developing other types of cancer later in life. Your child will be followed up closely into adulthood. They will be encouraged to get any new symptoms, such as a lump, checked early, and to have a healthy lifestyle to help to reduce cancer risk.
As a parent, your child having cancer is one of the worst situations you can be faced with. You may have many different emotions, such as fear, guilt, sadness, anger and uncertainty. These are all normal reactions and are part of the process that many parents go through at such a difficult time.
Your child may also have a variety of powerful emotions throughout their experience of cancer. We have information that discusses this further and talks about how you can support your child.
The Childhood Eye Cancer Trust (CHECT)
is a national charity that provides support and information about retinoblastoma.
Children's Cancer and Leukaemia Group (CCLG)
CCLG coordinates research and care for children and their parents. There are 21 CCLG specialist centres for the treatment of childhood cancer and leukaemia, covering all areas of the UK and Ireland (there's a map of the centres on its website). Has information about the CCLG and childhood cancer and leukaemia resources can be obtained from the address above.
CLIC Sargent offers practical support to children and young people aged 21 and under with cancer or leukaemia, and to their families.
This information has been compiled using a number of reliable sources, including:
- Kaufman P, Teed R. Overview of retinoblastoma. UpToDate. http://www.uptodate.com (accessed October 2012).
- Pizzo PA, et al. Principles and Practice of Paediatric Oncology. 6th edition. 2011. Lippincott Williams & Wilkins.
With thanks to: Dr Helen Jenkinson, Consultant Paediatric Oncologist; and the people affected by cancer who reviewed this edition. Reviewing information is just one of the ways you could help when you join our Cancer Voices network.
We worked with the Children's Cancer and Leukaemia Group (CCLG) to write our information about children's cancer.