Hodgkin lymphoma


Lymphomas are the third most common type of childhood cancer, accounting for around 10 per cent of cases – 160 children every year in the UK.

There are two main types of lymphoma – Hodgkin and non-Hodgkin lymphoma.

Hodgkin lymphoma is the slightly less common form, accounting for around two fifths of cases.

About lymphoma

Lymphomas start in the lymphatic system, the network of vessels that runs throughout the body carrying fluid containing white blood and other important immune system cells. Lymph nodes respond to infections by releasing white blood cells called lymphoid cells into the blood stream to fight it off.

When someone has lymphoma, lots of abnormal lymphoid or lymphoma cells are produced within a particular lymph node.

These are the same cells that become cancerous in people who have leukaemia, another form of blood cancer. The difference is that leukaemia develops in the bone marrow and affects normal blood cell production. Lymphoma, on the other hand, develops in the lymphatic system and does not affect normal blood cell production.

In patients with lymphoma the cancer cells cluster in the lymph nodes and form tumours. These cells can also spill into the blood stream and spread the cancer around the body, including to other lymph nodes.

Hodgkin lymphoma tends to affect the lymph nodes in the head and neck whereas non-Hodgkin lymphoma can affect any lymph node or related tissue in the body.

Hodgkin lymphoma

Hodgkin lymphoma is distinguished from other types of lymphoma by the type of cancer cell formed – the Reed-Sternberg cell – which is not found in any other blood cancer.

The exact cause of Hodgkin lymphoma is unknown. However, there is increasing evidence that infections (such as the virus that causes glandular fever) may play a part in its development, especially when it occurs in children.

It has been reported to occur more frequently among young children from developing countries than among those from countries of advanced socio-economic status. There is an increased risk of the disease among parents, siblings and identical twins of lymphoma patients.

Incidence 

Hodgkin lymphomas account for 41 per cent of all childhood lymphoma diagnoses – around 60 children a year in the UK.

Hodgkin lymphomas predominantly affect older children, with two thirds of cases occurring in the 10-14 year age group and no cases in infants.

Hodgkin lymphomas are almost twice as common among boys as among girls. This male excess becomes less marked with increasing age.

Survival

Almost all children with Hodgkin lymphoma can be cured. The five year survival rate is 96 per cent.

Diagnosis

Symptoms include a persistent (lasting a few weeks) painless swelling of a single lymph gland, usually in the neck, armpit or groin.

Cough or breathlessness can occur if the glands in the chest are affected.

Also fevers, sweats, itching and weight loss can occur.

The exact diagnosis will be confirmed by removing part or all of an affected lymph gland so that the cells can be examined in the laboratory. This is known as a biopsy and is usually carried out under general anaesthetic.

Further tests, such as X-rays, CT and MRI scans and blood tests are carried out to determine the exact size and position of the lymphoma and whether it has spread. This is known as staging.

Hodgkin lymphoma may be defined as stage 1, 2, 3 or 4, followed by A or B.

Stage 1 means that only one area of lymph nodes is affected at one site (either above or below the diaphragm - the muscle that separates the chest cavity from the abdominal cavity).

Stage 2 indicates that two or more areas are affected but, again, either above or below the diaphragm only.

Stage 3 implies lymph nodes are affected above AND below the diaphragm and possibly the spleen as well.

Stage 4 is the worst stage as it means the cancer has spread (to the liver, lungs or bone marrow).

A or B is added to the number to indicate whether there are systemic symptoms (fevers, weight loss, night sweats). A is used when there are none of these symptoms. B means the symptoms are present and this implies the child is more unwell and needs more treatment.

Treatment

The main treatment for both Hodgkin and non-Hodgkin lymphoma is chemotherapy. Sometimes radiotherapy is also required. If the cancer has not spread beyond its original site, radiotherapy alone may be used, following surgery to remove the affected lymph nodes. The type and amount of treatment given depends on the stage of the disease at diagnosis.

Where chemotherapy is used, it will usually be given every few weeks for a number of months.
Where radiotherapy is used, it is usually given for a few minutes each day over a period of two to four weeks.

Treatment may last for anything between a few months and two years, depending on the exact type of lymphoma and the stage to which it has progressed.

Read more: Commonly used terms in treatment

Side effects and complications

Treatment often causes side effects. These will depend on the particular treatment being used and the part of the body being treated but may include:

  • Hair loss
  • Tiredness
  • Nausea
  • Vomiting
  • Reduced resistance to infection
  • Bruising and bleeding
  • Diarrhoea

A small number of children may develop late side effects, sometimes many years later, that are caused by their treatment for lymphoma.

The main risks arise from the use of radiotherapy, which may impair growth and cause infertility. The risk of infertility is greater among boys and the risk is increased if both radiotherapy and chemotherapy are used.

There is a risk of hypothyroidism associated with irradiation to the neck.

Both radiotherapy and chemotherapy have been associated with heart and lung complications.

There is an increased risk of second cancers in those who survive childhood cancer, thought to be associated with the treatments used.

The possible risks of any treatment given will be explained by the child’s doctor before treatment begins. Every effort will be made to minimise the risk of these kinds of complications.

Read more: Side effects of treatment

Follow-up

Children will have regular follow-up appointments, following their treatment for Hodgkin lymphoma. These appointments are to check for any recurrence of the cancer and for any problems that may arise as a result of the treatment they were given (late effects).

Occasionally, the cancer can recur.  When this happens it is called a relapse. Relapse occurs most likely as a result of a few of the original cancer cells surviving the treatment.  Sometimes, this is because cancer cells spread to other parts of the body and were too small to be detected during the follow-up immediately after treatment. Treatment of the relapse will vary and be discussed as it may differ from the original course of treatment.

Read more: Long-term and late effects of treatment

Research

Many children have their treatment as part of a clinical trial.

Trials aim to improve our understanding of the best way to treat the cancer, usually by comparing the standard treatment with a new or modified version.

If appropriate, the child’s medical team will discuss participation in a relevant trial. Participation is optional but may offer the opportunity to receive new treatments.

Further information

More detailed information about Hodgkin lymphoma in children and its treatment is available from Macmillan Cancer Support

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