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Cyclacel's biomarker technology shows that CYC202 induces cancer cells to commit suicide

Washington, DC, 14 July 2003 - Cyclacel Limited, the UK-based biopharmaceutical company, reported today that it demonstrated through state-of-the-art biomarker technology that CYC202 (R-roscovitine), its lead CDK inhibitor drug candidate, appears to induce cancer cell suicide or apoptosis in patients receiving the drug. Details of the biomarker data obtained with CYC202 were reported today at an oral presentation at the American Association for Cancer Research (AACR) annual meeting taking place here.

Biomarker technology is used to understand the molecular mechanism of action of novel drugs in humans, provide insights into their pharmacological properties, measure their biological effect (e.g. induce cancer cells to commit suicide) and determine susceptibility or resistance to the treatment. In the long-term biomarker analysis of tumour blood and tissues may allow selective treatment with CYC202 of those patients identified as likely to benefit from the drug based on the specific genetic profile of their tumour.

Biomarker analysis of blood samples from patients with cancer treated with CYC202 demonstrated that 54% (14 of 26 analysed) tested positive for cancer cell death or apoptosis following single agent treatment with the drug. In addition, seven CYC202 Phase I patients with various tumours, including pancreas and lung cancer, experienced long lasting tumour stabilisation. These patients received CYC202 capsules taken by mouth after exhausting other treatment options. CYC202 is presently being tested in two international, multicentre Phase IIa clinical trials for the treatment of breast and lung cancer in combination with standard chemotherapy.

Cyclacel's Biomarker Team used a novel assay technique to calculate the extent by which cancer cells are committing suicide (or apoptotic index) in different patients on the drug. An advantage of this test is that it measures cellular material released into the circulation by dying or dead cance
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Contact: Robert Gottlieb
robert.gottlieb@fkhealth.com
617-577-8110
Feinstein Kean Healthcare
14-Jul-2003


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