News Release 

One in five hematological cancer patients suffer blood clots or bleeding

Aarhus University

New Danish research may help direct focus towards the serious complications that on average every fifth haematological cancer patient suffers. This is according to medical doctor and PhD Kasper Adelborg from Aarhus University and Aarhus University Hospital, who has studied the cases of 32,000 haematological cancer patients between the years 2000-2013. Haematological cancer includes leukaemia, bone marrow cancer and cancers of the lymph nodes.

"This is a broad group of patients with very different disease experiences depending on the type of haematological cancer. Some patients have a particular risk of suffering blood clots, while others have instead a higher risk of bleeding such as e.g. gastrointestinal bleeding," says Kasper Adelborg, before stating that the new knowledge can be used for even better prevention and individualised treatment:

"If a person has a high risk of suffering a blood clot, treatment with anticoagulant medicine can benefit some patients. But anticoagulant medicine is not desirable if the risk of suffering bleeding is higher. This is a difficult clinical problem, but our study can set goals for what carries most weight for each individual type of cancer," he says.

One example is the disease myelodysplastic syndrome (MDS), which is a type of bone marrow cancer. Here the study showed that the risk of bleeding within ten years was approx. fifteen per cent, while the risk of suffering a blood prop was lower.

"This means that doctors who help these patients should be aware that they have a high risk of bleeding and should therefore not prescribe too much anticoagulant medicine," says Kasper Adelborg.

He adds that with each individual patient there is still a need to weigh up the overall risk of a blood prop and bleeding, which includes taking into account the patient's age, medical history, other diseases, lifestyle etc. before choosing a treatment.

Major preventative potential:

The new study, which has been published in the Journal of Thrombosis and Haemostasis, corroborates previous studies, though researchers have not previously looked at the entire group of haematological cancer patients together - and neither were there any studies covering so many years. Additionally, previous studies have either focused solely on blood clots or bleeding.

Kasper Adelborg emphasises that there are major differences in the prognoses for the different patient groups. For example. only a few children develop a blood prop of suffer bleeding in the years after suffering from leukaemia, while far more patients with e.g. bone marrow cancer develop blood props and/or bleeding.

"The potential for prevention is particularly large in the latter group," he says.

In relation to the population as a whole, the study shows the heightened risk for haematological cancer patients:

  • Blood clot in the heart: Forty per cent higher.
  • Blood clot in the brain: Twenty per cent higher.
  • Blood clot in the legs and lungs: over three hundred per cent higher.
  • Bleeding: Two hundred per cent higher.

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The research results - more information:

Type of study: National population-based register-based study.

Most important partners: Henrik Toft Sørensen, Mikael Rørth and Henrik Frederiksen.

External funding: Aarhus University research Foundation and the Program for Clinical Research Infrastructure (PROCRIN).

Read the scientific article in the Journal of Thrombosis and Haemostasis.

Contact:

MD, PhD Kasper Adelborg
Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University and Aarhus University Hospital
Telephone: (+45) 2034 1724
Email: kade@clin.au.dk

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