Learn about myeloproliferative neoplasms, including polycythaemia vera, essential thrombocythaemia, myelofibrosis, and CML. Understand symptoms, diagnosis, treatment, diet, and when to seek medical help.
Overview
What are myeloproliferative neoplasms?
Myeloproliferative neoplasms, often shortened to MPNs, are a group of blood cancers where the bone marrow makes too many blood cells.
The bone marrow is the “factory” inside the bones that makes blood. In MPNs, this factory becomes overactive. It may produce too many:
- Red blood cells
- White blood cells
- Platelets
- Or a mixture of these cells
Most MPNs develop slowly. Many people live with them for many years with regular monitoring and treatment. However, some MPNs can cause complications such as blood clots, bleeding, an enlarged spleen, worsening bone marrow scarring, or rarely, transformation to acute leukaemia.
Main types of MPN
The main chronic myeloproliferative neoplasms include:
- Polycythaemia vera, PV
The body makes too many red blood cells. This can make the blood thicker and increase the risk of blood clots. - Essential thrombocythaemia, ET
The body makes too many platelets. This can increase the risk of blood clots, and sometimes bleeding. - Myelofibrosis, MF
The bone marrow becomes scarred. Blood cell production becomes less effective, and the spleen may become enlarged. - Chronic myeloid leukaemia, CML
The body makes too many abnormal white blood cells. CML is usually linked to a specific genetic change called the Philadelphia chromosome or BCR-ABL1 gene fusion.
There are also rarer forms of MPN, but PV, ET, MF, and CML are the most commonly discussed types.
Who is affected?
MPNs are uncommon. They are usually diagnosed in adults, especially middle-aged or older adults. They can occasionally occur in younger people. Some patients have no symptoms and are diagnosed after a routine blood test shows abnormal blood counts.
Causes and Risk Factors
Why does it happen?
Most MPNs happen because of acquired genetic changes in the blood-forming stem cells. “Acquired” means the change develops during life. It is usually not inherited from parents.
Common gene changes include:
- JAK2 mutation, often seen in PV, ET, and MF
- CALR mutation, often seen in ET and MF
- MPL mutation, sometimes seen in ET and MF
- BCR-ABL1 gene fusion, seen in CML
These changes act like a stuck accelerator pedal, telling the bone marrow to keep making blood cells even when the body does not need more.
Are certain people more at risk?
Risk may be higher in:
- Older adults
- People with a previous blood disorder
- People with a family history of MPN, although this is uncommon
- People exposed to high levels of radiation or certain chemicals, although this is rare
For most patients, there is no clear cause.
Symptoms
Some people have no symptoms at diagnosis. Others may have symptoms caused by thickened blood, high platelets, inflammation, anaemia, or an enlarged spleen.
Common symptoms include:
- Tiredness or low energy
- Headaches
- Dizziness
- Blurred vision or visual disturbances
- Itchy skin, especially after a warm bath or shower
- Night sweats
- Weight loss
- Fever without infection
- Bone pain
- Numbness, tingling, redness, or burning pain in the hands and feet
- Easy bruising or unusual bleeding
- Abdominal fullness or discomfort due to an enlarged spleen
- Shortness of breath
- Frequent infections in some cases
Urgent symptoms to watch for
Seek urgent medical attention if you develop:
- Chest pain
- Sudden shortness of breath
- Weakness on one side of the body
- Sudden speech difficulty
- Sudden severe headache
- Painful swollen leg
- New severe abdominal pain
- Heavy or unusual bleeding
These may suggest a blood clot, stroke, heart problem, or serious bleeding.
Diagnosis
How is it diagnosed?
MPNs are usually suspected after abnormal blood test results. Diagnosis is confirmed by combining blood tests, genetic tests, and sometimes a bone marrow examination.
Common tests
Your doctor may arrange:
- Full blood count
Measures red cells, white cells, haemoglobin, and platelets. - Blood film
Looks at the shape and appearance of blood cells under a microscope. - JAK2, CALR, MPL mutation testing
Helps diagnose PV, ET, or MF. - BCR-ABL1 testing
Important to diagnose or exclude CML. - Erythropoietin level
Often used when PV is suspected. - Iron studies
Checks iron levels, which may affect red cell production. - Uric acid and kidney function tests
Useful because high cell turnover can affect uric acid levels. - Bone marrow aspiration and trephine biopsy
Checks the bone marrow structure, cell production, fibrosis, and abnormal cells. - Ultrasound or imaging of the abdomen
May be used to assess spleen size.
A haematologist will interpret the results and decide which type of MPN is present.
Treatment Options
Treatment depends on:
- Type of MPN
- Age
- Blood counts
- Symptoms
- Risk of blood clots or bleeding
- Previous clotting history
- Mutation results
- Spleen size
- Overall health
The goals are to reduce symptoms, lower the risk of blood clots or bleeding, control blood counts, and reduce the chance of disease progression.
Common treatment approaches
1. Observation
Some low-risk patients may not need immediate treatment. They are monitored with regular blood tests and clinic visits.
2. Aspirin
Low-dose aspirin may be used in some patients to reduce clotting risk. It is not suitable for everyone, especially if there is a bleeding risk.
3. Venesection or phlebotomy
This is commonly used in PV. Blood is removed in a controlled way to reduce red cell levels and make the blood less thick.
4. Cytoreductive therapy
These medicines reduce blood cell production. Options may include:
- Hydroxyurea
- Interferon
- Anagrelide, mainly for platelet control in selected ET patients
5. JAK inhibitors
Medicines such as ruxolitinib may be used in selected patients, especially for myelofibrosis or symptomatic PV. They may help reduce spleen size and improve symptoms.
6. CML-targeted therapy
CML is usually treated with tyrosine kinase inhibitors, or TKIs. These target the BCR-ABL1 abnormality and have transformed CML into a highly treatable long-term condition for many patients.
7. Blood transfusion
Some patients with myelofibrosis may need red cell transfusions if they develop significant anaemia.
8. Stem cell transplant
Allogeneic stem cell transplant is the only treatment with curative potential for some patients with higher-risk myelofibrosis, but it carries significant risks. It is usually considered only for selected fit patients.
Advanced or investigational therapies
Clinical trials may study newer targeted drugs, combinations of JAK inhibitors, anti-fibrosis approaches, anaemia-directed treatments, and other disease-modifying therapies. Suitability depends on the exact MPN type and risk category.
Dietary Advice
There is no special diet that cures MPN. The practical aim is to support heart and blood vessel health, reduce clotting risk, maintain strength, and manage treatment side effects.
What to eat
Aim for:
- Vegetables and fruit daily
- Whole grains such as oats, brown rice, and wholemeal bread
- Lean protein such as fish, chicken, tofu, eggs, beans, and lentils
- Healthy fats from nuts, seeds, olive oil, and fish
- Adequate water intake, unless your doctor has restricted fluids
- Iron-rich foods only if advised, especially in PV where iron replacement may not always be appropriate
What to limit
Limit:
- Smoking, ideally stop completely
- Excess alcohol
- Highly processed food
- Sugary drinks
- Excess salt
- Large amounts of red or processed meat
Important supplement advice
Do not start iron tablets unless your doctor advises it. This is especially important in polycythaemia vera, where iron replacement can sometimes worsen high red cell production.
Discuss supplements with your doctor if you are taking aspirin, blood thinners, interferon, JAK inhibitors, or other cancer medicines. Some supplements may increase bleeding risk or interact with medication.
Examples to discuss before using regularly:
- Fish oil capsules
- Ginkgo
- Garlic tablets
- High-dose vitamin E
- Traditional or herbal remedies
Food safety
If you are on treatment that lowers immunity, follow food safety precautions:
- Wash fruit and vegetables well
- Avoid undercooked meat, seafood, and eggs
- Avoid unpasteurised milk products
- Store food safely
- Seek medical advice early for fever
Living with the Condition
Daily activities
Many people with MPN continue work, family life, travel, and normal daily activities. The key is regular follow-up and early reporting of new symptoms.
Helpful steps:
- Attend scheduled blood tests
- Keep a record of blood counts and medications
- Report new bleeding, clotting symptoms, fever, weight loss, or worsening fatigue
- Take medication exactly as prescribed
- Tell your doctor before surgery, dental procedures, or long-haul travel
Exercise and lifestyle
Exercise helps circulation, energy, mood, and heart health.
Good options include:
- Walking
- Cycling
- Swimming
- Light resistance training
- Stretching or yoga
Avoid sudden overexertion if you are anaemic, breathless, or have a very enlarged spleen. If your spleen is enlarged, avoid contact sports unless cleared by your doctor.
Emotional well-being
Living with a long-term blood cancer can cause worry, especially when the disease is slow-moving but not “gone.” This is common.
Helpful strategies include:
- Asking your haematologist to explain your risk category
- Knowing which symptoms require urgent attention
- Joining reputable patient support groups
- Speaking to a counsellor if anxiety affects sleep, work, or daily life
- Bringing a family member to clinic visits if helpful
Long-term monitoring
Follow-up may include:
- Full blood counts
- Symptom review
- Medication side effect checks
- Spleen assessment
- Mutation or molecular monitoring in CML
- Bone marrow reassessment in selected cases
FAQs
1. Is MPN a cancer?
Yes. MPNs are classified as blood cancers. However, many MPNs behave slowly. Some patients live for many years with monitoring and treatment.
2. Can MPN be cured?
Most MPNs are managed rather than cured. Stem cell transplant can potentially cure some higher-risk patients, especially in myelofibrosis, but it is not suitable for everyone because it has major risks.
3. Will I need chemotherapy?
Not always. Many treatments for MPN are tablets, injections, aspirin, venesection, or targeted therapy. The best treatment depends on the type of MPN and your risk profile.
4. Can I travel if I have MPN?
Usually yes. Ask your doctor before long flights, especially if you have a history of blood clots, high blood counts, or are on blood thinners. Keep hydrated, move regularly, and carry your medication.
5. Should my family members be tested?
Usually no. Most MPNs are not directly inherited. Family testing is not routinely needed unless your doctor suspects a rare familial pattern.
When to Contact a Doctor
Contact your doctor promptly if you develop:
- New or worsening headaches
- Blurred vision
- Unusual bruising or bleeding
- Black stools or blood in urine
- Worsening tiredness or breathlessness
- Fever or repeated infections
- Unexplained weight loss
- Increasing abdominal swelling or discomfort
- New leg swelling or pain
- Symptoms suggestive of stroke, heart attack, or blood clot
For sudden chest pain, stroke-like symptoms, severe shortness of breath, or heavy bleeding, seek emergency care immediately.