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Weakness Of a Chemotherapy Resistant Form Of Leukemia Found

by Rishika Gupta on December 23, 2018 at 12:26 PM
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 Weakness Of a Chemotherapy Resistant Form Of Leukemia Found

A combination of ibrutinib, a targeted treatment already in clinical use, with a new inhibitor called AZD8055 can help treat hard to treat cases of chronic lymphocytic leukemia (CLL).

The research carried out in collaboration with NHS Greater Glasgow and Clyde (NHSGGC) and published in Clinical Cancer Research, found that the combination of ibrutinib, a targeted treatment already in clinical use, with a new inhibitor called AZD8055, helped promote CLL cell death in a preclinical study.

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This study, which used CLL patient samples and a CLL mouse model, found that combination of these two inhibitors activated a protein called FOXO1, multiplying and inducing CLL cell death.

Chronic lymphocytic leukemia (CLL) is a blood cell cancer affecting white blood cells. The disease more commonly affects people over the age of 60. The disease course can vary from patient to patient, with some patients experiencing a stable low-grade disease that does not require treatment, while others develop resistance to chemotherapy treatments given.
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The introduction of ibrutinib into the clinic as a treatment of high-risk CLL patients has enhanced the survival of this difficult to treat a subset of CLL patients. However, the CLL cells can adapt to the drugs, developing mutations and therefore becoming resistant to ibrutinib leaving few therapeutic options for patients.

Novel combination of treatments offer the potential to reduce the ability of the CLL cell to adapt to the treatment which attacks the cell in two places as opposed to one.

Dr. Alison Michie, who led the study, said: "Reducing the ability of CLL cells to survive is key to interrupting disease progression. In our study, we established that by targeting and inhibiting the function of a protein called mTOR which is often deregulated in cancer, we improved the killing which is currently being used in the clinic to treat high-risk CLL patients, enhances the activation of FOXO1, a protein that can promote cell death, in a preclinical model. Our findings are important because they could demonstrate a potential new therapeutic approach for treating Cancer Research. The study was funded by the Medical Research Council (MRC) and Bloodwise.

Source: medindia
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