A form of interleukin-2 used as immunotherapy for advanced cancer
Aldesleukin
An immunotherapy medicine used for some advanced cancers, which stimulates the immune system to attack cancer cells.
What is Aldesleukin?
Aldesleukin is a specialist immunotherapy, a laboratory-made form of a natural immune messenger called interleukin-2, used to treat some people with advanced kidney cancer or melanoma. It works by revving up the immune system so it attacks cancer cells. It is a powerful and potentially toxic treatment whose most serious effect is capillary-leak syndrome, where fluid leaks out of blood vessels causing dangerously low blood pressure and poor blood flow to organs. Because of this, it is given only in specialist centres with intensive-care backup and close monitoring.
Education and reference only. This is a plain-language guide to Aldesleukin — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Aldesleukin is a man-made version of interleukin-2, a natural chemical the body uses to switch on parts of the immune system. As a medicine, it is used as immunotherapy for selected people with advanced cancer, mainly kidney cancer that has spread and melanoma. It is given by injection or infusion in hospital, usually in courses, and only in centres experienced in its use because it can cause severe, sometimes life-threatening, effects. It is a high-intensity treatment chosen carefully for people fit enough to tolerate it.
How it works
Aldesleukin acts like the body's own interleukin-2, stimulating immune cells such as T-cells and natural killer cells to grow and become more active. This boosted immune response can recognise and attack cancer cells, which is how it may shrink tumours in some people. The same powerful immune and inflammatory activation, however, is responsible for its serious side effects, including capillary-leak syndrome, where blood vessels become leaky and fluid escapes into the tissues. This is why it is given under close hospital supervision with intensive monitoring.
Company & origin
Originated / developed by: Specialist manufacturer.
A specialist immunotherapy used in the UK for some people with advanced kidney cancer or melanoma, given only in centres set up for intensive care.
Practical use
How to take Aldesleukin
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- It is given in hospital by injection or infusion by a specialist cancer team, not something you take at home.
- Expect to be closely monitored during treatment, including your blood pressure, breathing and kidney function.
- Tell the team straight away about symptoms such as dizziness, breathlessness, swelling, confusion or feeling very unwell.
- Attend all planned treatment and monitoring appointments, as the team adjusts care based on how you respond.
- Follow the team's advice about rest, fluids and managing flu-like effects between treatments.
Weighing it up
Advantages & disadvantages of Aldesleukin
Advantages
- Can shrink tumours and help some people with advanced kidney cancer or melanoma when other options are limited.
- Works by harnessing the person's own immune system to attack cancer cells.
- A small number of people can have long-lasting responses.
Disadvantages
- Can cause capillary-leak syndrome, with dangerously low blood pressure and poor blood flow to organs.
- Frequently causes severe flu-like effects and can affect the heart, lungs, kidneys and other organs.
- Must be given in specialist centres with intensive-care backup and is only suitable for carefully selected people.
Practical use
Good to know
The most important thing to understand about aldesleukin is that it is a powerful, high-risk treatment given only in specialist centres with intensive-care support. Its hallmark serious effect is capillary-leak syndrome: fluid leaks out of the blood vessels, which can cause a dangerous drop in blood pressure and reduced blood flow to vital organs such as the kidneys, heart and lungs. Because of this, blood pressure, breathing, kidney function and fluid balance are watched extremely closely throughout treatment, and the team is ready to step in quickly. Flu-like effects such as fever, chills, tiredness and aches are very common. It is reserved for carefully selected people who are otherwise fit enough, and it is not suitable for everyone with these cancers. The decision to use it always weighs the chance of benefit against these significant risks.
Who should not take it / use with caution
- People who have had a serious allergic reaction to aldesleukin should not receive it.
- It is not suitable for people with significant heart, lung, kidney or liver problems, or active serious infection, because of its toxic effects.
- It is avoided in people who are not fit enough to tolerate intensive treatment and monitoring, and is used with great caution in pregnancy.
Monitoring
- Close monitoring of blood pressure, heart rate, breathing and oxygen levels during treatment.
- Regular checks of kidney and liver function, blood counts and fluid balance.
- Watching for capillary-leak syndrome and other organ effects so treatment can be paused or supported quickly.
Side effects
- Capillary-leak syndrome, causing low blood pressure, swelling and reduced blood flow to organs.
- Very common flu-like effects such as fever, chills, tiredness, nausea and aches.
- Effects on the heart, lungs, kidneys, liver, blood counts and, sometimes, mood or confusion.
Key interactions
- Medicines that lower blood pressure can add to the drop in blood pressure it causes.
- Steroids may reduce its anti-cancer effect, so they are generally avoided unless needed for a serious reaction.
- It can affect the kidneys and liver, so other medicines handled by these organs may need review by the team.
Available as: A solution given by injection under the skin or by infusion into a vein in hospital.
Answers
Aldesleukin: frequently asked questions
What is aldesleukin used for?
It is an immunotherapy used for some people with advanced kidney cancer or melanoma, stimulating the immune system to attack cancer cells.
Why is it given only in specialist centres?
It can cause serious effects, especially capillary-leak syndrome with dangerously low blood pressure, so it needs close monitoring and intensive-care backup.
What is capillary-leak syndrome?
It is when fluid leaks out of the blood vessels, which can cause low blood pressure, swelling and reduced blood flow to vital organs; the team watches for this closely.
Will it make me feel unwell?
Flu-like effects such as fever, chills, tiredness and aches are very common during treatment; tell your team how you feel so they can help manage them.
Is it suitable for everyone with these cancers?
No. It is a high-risk treatment reserved for carefully selected people who are fit enough, and the team weighs the possible benefit against the significant risks.
Authoritative sources
- BNF
- NICE CKS
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