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Phase II Ibrutinib Monotherapy Study Shows CLL Patients Achieved Rapid And Sustainable Disease Control Irrespective Of Age Or High Risk Prognostic Factor

The Progression Free Survival probability for these patients at 12 months was estimated to be 94 percent. Most adverse events were mild and manageable and included diarrhea, fatigue and rash, severe events occurred in less than 13 percent of patients. 

"We are very pleased with the continued research that is being demonstrated at AACR across 9 different presentations. These advances show the potential breadth of the ibrutinib program and provide further opportunities for us to pursue. We are grateful for the continued support of our collaborators, investigators, patients and shareholders," said Bob Duggan, CEO and chairman of the board.

Ibrutinib has been designated as a FDA Breakthrough Therapy in CLL patients with deletion 17p, based on data from completed Phase I/II clinical studies, where ibrutinib as a monotherapy was used to treat patients with this disease. Ibrutinib has the potential to improve the outcome in this serious and life-threatening disease, and may provide a substantial improvement over existing therapies for this indication.

About Chronic Lymphocytic Leukemia

CLL is the most common type of leukemia, a cancer of the white blood cells. CLL is a B cell cancer that originates in the bone marrow. Approximately 16,000 patients in the US are diagnosed each year with CLL. The prevalence of CLL is approximately 113,000 in the US. The disease is a chronic disease of the elderly with an average survival of about 5 years. Patients commonly receive multiple lines of treatment over the course of their disease. CLL and Small lymphocytic lymphoma (SLL) are considered the same underlying disease. SLL is a disease that is limited to the lymph nodes.

About Ibrutinib

Janssen Biotech, Inc. and Pharmacyclics entered a collaboration and license agreement in December 2011 to co-develop and co-commercialize ibrutinib. Ibrutinib was designed to specifically target and selectively inhibit an enzyme called Bruton's tyrosine kinase (BTK). BTK is a key mediator of at least three critical B-cell pro-survival mechanisms occurring in parallel – regulation of apoptosis, adhesion, and cell migration and homing. Through these multiple signals, BTK regulation helps to direct malignant B-cells to lymphoid tissues, thus allowing access to a micro environment necessary for survival.

The effectiveness of ibrutinib alone or in combination with other treatments is being studied in several B-cell malignancies, including chronic lymphocytic leukemia/small lymphocytic lymphoma, mantle cell lymphoma, diffuse large B-cell lymphoma, follicular lymphoma, Waldenstrom's macroglobulinemia and multiple myeloma. To date five Phase III trials have been initiated with ibrutinib and a total of 26 trials are currently registered on

About Pharmacyclics

Pharmacyclics ® is a clinical-stage biopharmaceutical company focused on developing and commercializing innovative small-molecule drugs for the treatment of cancer and immune mediated diseases. Our mission and goal is to build a viable biopharmaceutical company that designs, develops and commercializes novel therapies intended to improve quality of life, increase duration of life and resolve serious unmet medical healthcare needs; and to identify promising product candidates based on scientific development and administrational expertise, develop our products in a rapid, cost-efficient manner and pursue commercialization and/or development partners when and where appropriate.

Presently, Pharmacyclics has three product candidates in clinical development and several preclinical molecules in lead optimization. The Company is committed to high standards of ethics, scientific rigor, and operational efficiency as it moves each of these programs to viable commercialization.

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