Cisplatin, fluorouracil (5-FU) and trastuzumab is a combination of cancer drugs. Cisplatin and fluorouracil are chemotherapy drugs, and trastuzumab (Herceptin) is a targeted drug called a monoclonal antibody.
You might have cisplatin, fluorouracil and trastuzumab as a treatment for stomach cancer that:
- has spread to another part of the body (advanced)
- has large amounts of HER2 protein (HER2 positive)
How it works
The chemotherapy drugs cisplatin and fluorouracil destroy quickly dividing cells, such as cancer cells. Trastuzumab works by attaching to HER2 on the surface of cancer cells. HER 2 is a protein that makes cells grow and divide, so trastuzumab stops the cancer cells from growing and dividing.
How you have it
You have all drugs as a drip into your bloodstream (intravenously).
Into your bloodstream
You have the treatment through a drip into your arm or hand. A nurse puts a small tube (a cannula) into one of your veins and connects the drip to it.
You might need a central line. This is a long plastic tube that gives the drugs into a large vein, either in your chest or through a vein in your arm. It stays in while you’re having treatment, which may be for a few months.
If you have a central line, you might be able to have fluorouracil through a small pump which slowly puts the fluid into your bloodstream (infusion). You can keep the pump in a small bag or attached to a belt. When the fluorouracil infusion finishes, the nurse blocks the end of the central line with a plastic cap until the start of your next treatment. A district nurse or chemotherapy nurse may be able to do this at home.
When you have it
You have treatment in cycles of treatment that last 21 days (3 weeks). First, you have 6 cycles of treatment with cisplatin and fluorouracil. You have each cycle of treatment in the following way:
- You have cisplatin as a drip into your bloodstream (intravenously)
- You have trastuzumab as a drip into your bloodstream
- You have an infusion of fluorouracil through a drip or a pump into your bloodstream
- You continue with fluorouracil as a drip or a pump into your bloodstream
- You have no treatment
You then start a new cycle of treatment. You might also have fluids into your bloodstream for a few hours before and after each cisplatin treatment. The extra fluids help to protect your kidneys.
After 6 cycles of treatment with cisplatin, trastuzumab and fluorouracil, you continue trastuzumab alone.
This continues for as long as the treatment is helping you and the side effects aren't too bad.
You have blood tests before and during your treatment. They check your levels of blood cells and other substances in the blood. They also check how well your liver and kidneys are working.
You may also have hearing tests and a heart scan before, during and after your treatment.
How often and how severe the side effects are can vary from person to person. They also depend on what other treatments you're having.
When to contact your team
Your doctor, nurse or pharmacist will go through the possible side effects. They will monitor you during treatment and check how you are at your appointments. Contact your advice line as soon as possible if:
- you have severe side effects
- your side effects aren’t getting any better
- your side effects are getting worse
Early treatment can help manage side effects better.
We haven't listed all the side effects here. Remember it is very unlikely that you will have all of these side effects, but you might have some of them at the same time.
Common side effects
These side effects happen in more than 10 in 100 people (more than 10%). You might have one or more of them. They include:
Risk of infection
Increased risk of getting an infection is due to a drop in white blood cells. Symptoms include a change in temperature, aching muscles, headaches, feeling cold and shivery and generally unwell. You might have other symptoms depending on where the infection is.
Infections can sometimes be life threatening. You should contact your advice line urgently if you think you have an infection.
Breathlessness and looking pale
You might be breathless and look pale due to a drop in red blood cells. This is called anaemia.
Bruising, bleeding gums or nosebleeds
This is due to a drop in the number of platelets in your blood. These blood cells help the blood to clot when we cut ourselves. You may have nosebleeds or bleeding gums after brushing your teeth. Or you may have lots of tiny red spots or bruises on your arms or legs (known as petechiae).
Tiredness and weakness (fatigue)
You might feel very tired and as though you lack energy.
Various things can help you to reduce tiredness and cope with it, for example exercise. Some research has shown that taking gentle exercise can give you more energy. It is important to balance exercise with resting.
Feeling or being sick
Feeling or being sick is usually well controlled with anti sickness medicines. Avoiding fatty or fried foods, eating small meals and snacks, drinking plenty of water, and relaxation techniques can all help.
It is important to take anti sickness medicines as prescribed even if you don’t feel sick. It is easier to prevent sickness rather than treating it once it has started.
Loss of appetite
You might lose your appetite for various reasons whilst having cancer treatment. Sickness, taste changes or tiredness can put you off food and drinks.
Diarrhoea or constipation
Tell your healthcare team if you have diarrhoea or constipation. They can give you medicine to help.
Changes to your hearing
You might have some hearing loss, especially with high pitched sounds. You might also have some ringing in your ears (tinnitus). Tell your doctor or nurse if you notice any changes.
To help prevent kidney damage, it is important to drink plenty of water. You might also have fluids into your vein before, during and after treatment. You have blood tests before your treatments to check how well your kidneys are working.
High temperature (fever)
If you get a high temperature, let your healthcare team know straight away. Ask them if you can take paracetamol to help lower your temperature.
Changes in levels of minerals in your blood
You may have changes in levels of minerals and salts in your blood, including low levels of sodium or high levels of uric acid (causing gout). You have regular blood tests during treatment to check this.
You might develop a cough or breathing problems. This could be due to infection, such as pneumonia or inflammation of the lungs (pneumonitis). Let your doctor or nurse know straight away if you suddenly become breathless or develop a cough.
Heart problems include changes to how your heart works. This can cause changes to your heart rhythm and your ankles can swell.
During treatment, your blood pressure may be lower or higher than normal. Tell your nurse if you feel dizzy, faint, or if you have headaches, nosebleeds, blurred or double vision, or shortness of breath. Your blood pressure usually goes back to normal while you are on treatment or when treatment ends.
Tell your doctor or nurse straight away if you have any chest pain. Your doctor might ask you to have tests to check your heart, such as an electrocardiogram (ECG).
Mouth sores and ulcers
Mouth sores and ulcers can be painful. It helps to keep your mouth and teeth clean, drink plenty of fluids, avoid acidic foods such as lemons. Chewing gum can help to keep the mouth moist. Tell your doctor or nurse if you have ulcers.
You could lose all your hair. This includes your eyelashes, eyebrows, underarm, leg and sometimes pubic hair. Your hair will usually grow back once treatment has finished but it is likely to be softer. It may grow back a different colour or be curlier than before.
Soreness, redness and peeling of palms and soles (hand foot syndrome)
The skin on your hands and feet may become sore, red, or may peel. You may also have tingling, numbness, pain and dryness. This is called hand-foot syndrome or palmar plantar syndrome.
Moisturise your skin regularly. Your healthcare team will tell you what moisturiser to use.
This usually happens with the first or second treatment of trastuzumab. Symptoms include a skin rash, itching, feeling hot and shivering. Other symptoms include redness of the face, dizziness, a headache, shortness of breath and anxiety.
Joint or muscle pain
You might feel some pain from your muscles and joints. Speak to your doctor or nurse about what painkillers you can take to help with this.
Hot flushes or sweats
We have some tips for coping with hot flushes and the possible treatments for men and women. Talk to your doctor if your hot flushes are hard to cope with. They might be able to prescribe you some medicines.
Skin and nail problems
Skin and nail problems include a skin rash, dry skin, itching and darker skin. Your nails may also become brittle, dry, change colour or develop ridges. This usually goes back to normal when you finish treatment.
Numbness or tingling in fingers or toes
Numbness or tingling in fingers or toes is often temporary and can improve after you finish treatment. Tell your healthcare team if you're finding it difficult to walk or complete fiddly tasks such as doing up buttons.
Taste changes may make you go off certain foods and drinks. You may also find that some foods taste different from usual or that you prefer to eat spicier foods. Your taste gradually returns to normal a few weeks after your treatment finishes.
Tummy (abdominal) pain
Tell your treatment team if you have this. They can check the cause and give you medicine to help.
You might have eye problems including blurred vision, sore, red, itchy, dry eyes (conjunctivitis) or an infection. Tell your doctor or nurse if you have this. They can give you eye drops or other medication to help.
Headaches and dizziness
Let your doctor or nurse know if you have headaches. They can give you painkillers. Don’t drive or operate machinery if you feel dizzy.
Swollen hands and feet
You may have swelling of your hands and legs due to a build up of fluid (oedema).
It can help to change a few things about how you try to sleep. Try to go to bed and get up at the same time each day and spend some time relaxing before you go to bed. Some light exercise each day may also help.
A runny nose
You might have a runny nose while having treatment.
Flu like symptoms
This can happen a few hours after treatment. It may include headaches, muscle aches (myalgia), a high temperature and shivering. Taking paracetamol every 6 to 8 hours can help.
Occasional side effects
These side effects happen in between 1 and 10 out of every 100 people (between 1 and 10%). You might have one or more of them. They include:
- inflammation around the drip site
- anxiety or depression
- liver problems that are very mild and unlikely to cause symptoms
- dry mouth
Rare side effects
This side effects happens in fewer than 1 in 100 people (fewer than 1%). You might have one or more of them. They include:
- yellowing of the skin and whites of the eyes
- inflammation of the lungs
- shaking and trembling
- a second cancer called acute leukaemia some years after treatment has finished
- low levels of magnesium in your blood
- problems with your brain that can cause headaches, seizures (fits) and confusion
- low levels of albumin in your body that can cause swelling and weakness
Coping with side effects
We have more information about side effects and tips on how to cope with them.
What else do I need to know?
Other medicines, foods and drinks
Cancer drugs can interact with some other medicines and herbal products. Tell your doctor or pharmacist about any medicines you are taking. This includes vitamins, herbal supplements and over the counter remedies.
Loss of fertility
You may not be able to become pregnant or father a child after treatment with these drugs. Talk to your doctor before starting treatment if you think you may want to have a baby in the future.
Men might be able to store sperm before starting treatment. And women might be able to store eggs or ovarian tissue. But these services are not available in every hospital, so you would need to ask your doctor about this.
Contraception and pregnancy
This treatment might harm a baby developing in the womb. It is important not to become pregnant or father a child while you're having treatment and for a few months afterwards.
Talk to your doctor or nurse about effective contraception before starting treatment. Let them know straight away if you or your partner falls pregnant while having treatment.
Don’t breastfeed during this treatment because the drug may come through into your breast milk.
Slow wound healing
This treatment can slow wound healing. If you need to have an operation you may need to stop taking it for a while beforehand. Your doctor will let you know when you can start taking it again.
Treatment for other conditions
Always tell other doctors, nurses, pharmacists or dentists that you’re having this treatment if you need treatment for anything else, including teeth problems.
Don’t have immunisations with live vaccines while you’re having treatment and for up to 12 months afterwards. The length of time depends on the treatment you are having. Ask your doctor or pharmacist how long you should avoid live vaccinations.
In the UK, live vaccines include rubella, mumps, measles, BCG, yellow fever and one of the shingles vaccines called Zostavax.
You can have:
- other vaccines, but they might not give you as much protection as usual
- the flu vaccine (as an injection)
- the coronavirus (COVID-19) vaccine - talk to your doctor or pharmacist about the best time to have it in relation to your cancer treatment
Members of your household who are aged 5 years or over are also able to have the COVID-19 vaccine. This is to help lower your risk of getting COVID-19 while having cancer treatment and until your
Contact with others who have had immunisations - You can be in contact with other people who have had live vaccines as injections. Avoid close contact with people who have recently had live vaccines taken by mouth (oral vaccines) such as the oral typhoid vaccine. Sometimes people who have had the live shingles vaccine can get a shingles type rash. If this happens they should keep the area covered.
If your immune system is severely weakened, you should avoid contact with children who have had the flu vaccine as a nasal spray as this is a live vaccine. This is for 2 weeks following their vaccination.
Babies have the live rotavirus vaccine. The virus is in the baby’s poo for about 2 weeks and could make you ill if your immunity is low. Get someone else to change their nappies during this time if you can. If this isn't possible, wash your hands well after changing their nappy.
Low levels of DPD
Between 2 and 8 out of 100 people (2 to 8%) have low levels of an enzyme called DPD in their bodies.
Low levels of DPD can increase your risk of having severe side effects from fluorouracil. These side effects can rarely be life threatening. Talk to your doctor if you are worried and about whether you need to have a test to check for it.
More information about this treatment
For further information about this treatment go to the electronic Medicines Compendium (eMC) website.
You can report any side effect you have to the Medicines Health and Regulatory Authority (MHRA) as part of their Yellow Card Scheme.
This page is due for review. We will update this as soon as possible.