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Updated Clinical Results Show Experimental Agent Ibrutinib as Highly Active in CLL Patients
Date:12/8/2012

COLUMBUS, Ohio Updated results from a Phase Ib/II clinical trial indicates that a novel therapeutic agent for chronic lymphocytic leukemia (CLL) is highly active and well tolerated in patients who have relapsed and are resistant to other therapy.

The agent, ibrutinib (PCI-32765), is the first drug designed to target Bruton's tyrosine kinase (BTK), a protein essential for CLL-cell survival and proliferation. CLL is the most common form of leukemia, with about 15,000 new cases annually in the U.S. About 4,400 Americans die of the disease each year.

Study co-leader Dr. John C. Byrd, director of the division of hematology at Ohio State University Comprehensive Cancer Center Arthur G. James Cancer Hospital and Richard J. Solove Research Institute (OSUCCC James) presented these findings today (12/8) at the 54th Annual Meeting of the American Society of Hematology (ASH) Annual Meeting in Atlanta, GA.

The study found that response to therapy was high across cohorts, with 71 percent of previously untreated older patients experiencing a complete or partial response at either treatment dose (420mg and 840mg). The same response was observed in 67 percent of the relapsed patients and half (50%) of the high-risk patient cohort. After 22 months of follow-up, the disease had not progressed in 96 percent of previously untreated patients and 76 percent of relapsed and high-risk patients.

"These findings are truly exciting because they demonstrate ibrutinib's potential as a highly active, well-tolerated first-line therapy for CLL that produces a high rate of durable remissions the remissions last months on end," Byrd says. "The drug is effective in part because patients are willing to stay on treatment since the side effects are very tolerable," he states.

Only non-severe side effects, including diarrhea, fatigue, chest infection, rash, nausea, joint pain and infrequent and transient low blood counts were observed. Investigators found no evidence of c
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Contact: Liz Bryan, Spectrum
lbryan@spectrumscience.com
443-506-1931
Ohio State University Medical Center
Source:Eurekalert

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