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Toward a more efficient therapy for a specific form of leukemia
Date:6/14/2011

Chronic myeloid leukemia (CML) is a particular form of leukemia or cancer of the bone marrow, which can be treated with targeted imatinib. However, in some cases this medicine has no effect. Researchers at the VIB Vesalius Research Centre, K.U. Leuven, under the direction of Peter Carmeliet, have investigated the role of placental growth factor (PlGF) in mice with CML. Blocking this growth factor increases the life expectancy of these mice, even in those resistant to imatinib.

Chronic myeloid leukemia (CML)

In our body, white blood cells combat foreign intruders, such as viruses and bacteria. In chronic myeloid leukemia, the formation of granulocytes, a particular type of white blood cells, is disturbed. The cells in the bone marrow which should grow into white blood cells show an uncontrolled increase in numbers as a result of a disruption in the maturing process. This uncontrolled growth may damage various tissues and adversely affect the production of normal blood cells in the bone marrow. A shortage of white blood cells makes patients more susceptible to infection.

The Philadelphia chromosome and imatinib

Under normal circumstances, our body very accurately regulates the production of white blood cells. This process is triggered by targeted activation of tyrosine kinase. In most forms of CML, a deviant chromosome is present - the Philadelphia chromosome - which gives rise to BCR-ABL1 fusion kinase. This kinase causes the trouble, leading to the increase in CML cells. Existing medicines (imatinib) therefore target this kinase.

While the effect of imatinib in CML patients is usually quite favorable, the use of imatinib is often not sufficient to remove the diseased cells from the body. Sometimes the disease is already too advanced at the start of treatment, or there is resistance.

Placental growth factor

Researchers from the team headed by Peter Carmeliet have stu
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Contact: Evy Vierstraete
info@vib.be
329-244-6611
VIB (the Flanders Institute for Biotechnology)
Source:Eurekalert

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