MDS symptoms: What are the signs of pre-leukemia?MDS, or myelodysplastic syndrome, refers to a group of blood cancers. In this article, learn about the symptoms and complications of this disease.15 Sep 20175

Myelodysplastic syndrome refers to a range of blood disorders. They are cancers in which newly created blood cells in the bone marrow do not develop

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Myelodysplastic syndrome refers to a range of blood disorders. They are cancers in which newly created blood cells in the bone marrow do not develop into healthy working blood cells.

Myelodysplastic syndrome (MDS) has often been referred to as pre-leukemia or smoldering leukemia. But as only around one-third of people who have MDS progress to leukemia, this term is no longer widely used.

In this article, we explore the symptoms of MDS, complications, causes, and risk factors. We will also give a brief overview of diagnosis, treatment, and outlook for this condition.

Contents of this article:

  1. What is MDS?
  2. Symptoms
  3. Complications
  4. Causes and risk factors of MDS
  5. Diagnosis and treatment
  6. Outlook

What is MDS?

3D rendered image of red blood cell platelets.

MDS refers to a group of cancers that affects the blood cells and bones marrow.

MDS can refer to any one of a number of cancers that affect the blood cells and bone marrow.

The body creates new blood cells in the bone marrow, which is soft tissue found in the cavities of most bones.

If these blood cells develop abnormally, the body may not have enough new blood cells to work properly, and this can cause MDS.

Blood stem cells grow and then divide to become red blood cells, white blood cells or platelets. Each of the three types of blood cell has a unique function in the body. If these cells are damaged or reduced in number, it can have a negative impact on a person’s health.

Understanding what each of these cells do can help to explain the symptoms of MDS.

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Symptoms

The early stages of MDS may have no obvious signs or symptoms.

A blood test is likely to show a reduced number of cells in the body or low cell count. If the cell count is particularly low, a person may begin to experience some or all of the following symptoms, depending on whether red blood cells, white blood cells, or platelets are affected.

Red blood cells

Red blood cells carry oxygen throughout the body.

Anemia is caused by a reduced number of healthy red blood cells. The signs of anemia are often related to a lack of oxygen getting to the organs and cells in the body.

Symptoms, ranging from mild to severe, may include the following:

  • fatigue
  • lack of energy
  • lightheadedness
  • pale skin
  • heart palpitations
  • shortness of breath
  • chest pain

It is important to be aware that anemia is a very common blood disorder that can be caused by several factors so may not be a symptom of MDS.

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White blood cells

The role of white blood cells is to fight disease and infection.

Frequent or unusually severe infections could be a sign that the white blood cells in the body are not working properly. A low white blood cell count that is below the normal range is referred to as neutropenia.

Platelets

Platelets help the body to heal and the blood to clot.

A low level of platelets in the body is referred to as thrombocytopenia, and there are two main symptoms:

  • bruising and bleeding more easily or more than usual
  • small, dark red pinpoint spots that are caused by blood entering the skin

Possible signs of MDS could be having many more nosebleeds than normal, bruising after minor injuries, or experiencing bleeding gums.

Complications

Male dentist preparing a female patient.

A common complication of MDS is bleeding gums after dental work. Medical advice should be sought before making a dental appointment.

Infection and bleeding pose a risk to a person with MDS, so care should be taken to avoid injuries that could cause bruising or bleeding.

Dental work can often cause bleeding gums, and advice should be sought from a doctor before a dental appointment.

In around one-third of people, MDS will progress to acute myeloid leukemia (AML), which is a cancer of the blood cells.

Once someone has been tested for MDS, a doctor will judge how likely it is that the disease will progress to AML.

Treatment for MDS has some side effects, such as nausea and vomiting from chemotherapy, or fatigue and fever from immunotherapy. Side effects will depend on the treatment being given and will vary from person to person.

It is advised that people eat a healthful diet, exercise if they can, seek advice and support, and take time to relax when undergoing treatment.

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Causes and risk factors of MDS

MDS can occur when blood cells and bone marrow become damaged and stop working as they should, but why this happens remains unknown.

Research on blood DNA has shown a link between genetic changes and blood disorders.

Certain genes contain information about how cells should grow and divide, and mutations in these genes can send the wrong information to cells, meaning they develop abnormally.

Also, risk factors for MDS often relate to chemicals or processes that could cause damage to cells or genes.

Although there are risk factors that make it more likely that a person could develop MDS, having a risk factor does not mean that they will get the disease.

The American Cancer Society suggest that risk factors for MDS might include:

  • past treatment with chemotherapy or radiation therapy for cancer
  • exposure to certain chemicals, including pesticides, tobacco smoke or benzene
  • exposure to heavy metals, such as mercury or lead
  • stem cell or bone marrow transplants
  • age with most cases of MDS occurring in people over 60 years old


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Diagnosis and treatment

Young woman in lab, looking at a sample through a microscope.

MDS may be diagnosed using a biopsy of the bone marrow.

The differences between each blood disorder classified as MDS will depend on which of the blood cells types are affected, and any changes to bone marrow.

The National Cancer Institute recognize eight different blood disorders. Specific testing can be used to identify which of these is present.

During testing for MDS, people can expect some or all of the following:

  • questions about medical history, including symptoms, illnesses, injuries, and medication
  • a physical exam to check for signs of MDS, such as infection, bruising, or pain
  • blood tests to look at the health of blood cells
  • a bone marrow biopsy and aspiration, to remove a small amount of bone and bone marrow for testing
  • genetic tests to look for any abnormalities or mutations in the genes

MDS is currently incurable, although clinical trials and research continue to explore possible new treatments.

Treatment will be different for each person. It is likely to include supportive care that helps to relieve symptoms and side effects of MDS, such as a blood transfusion or antibiotics.

This care will be provided alongside treatments that sometimes include chemotherapy, immunotherapy, or hematopoietic cell transplant (HCT), which replaces unhealthy blood stem cells with healthy ones.

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Outlook

The outlook will vary for every person and a scoring system will often be used to help doctors decide on the best treatment.

The Revised International Prognostic Scoring System (IPSS-R) is widely used and looks at a range of factors, such as age, low blood cell counts, and genetic changes.

A lower risk score will mean that MDS is likely to progress slowly and so will require less intensive treatments to begin with. A higher risk score will mean that more intensive treatment may be needed to prevent further health problems.

If anyone is concerned about symptoms that they might have, or if they suspect that they could be linked to MDS, they are advised to speak to a doctor.

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