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Investigational agent targets gene signaling pathways to improve response for patients with CLL
Date:12/8/2012

s and increasing their risk of developing treatment-related acute myeloid leukemia.

To understand if ibrutinib may be effective for elderly CLL patients and to identify which patients might benefit most from the drug, researchers enrolled 116 CLL patient participants in several treatment cohorts: patients who were never treated (the treatment-nave group), those who had received two or more prior therapies (the relapsed/refractory group), those who had relapsed within two years of treatment (the high-risk group), and those over age 65. Two oral dosing regimens (420 mg or 840 mg daily) of ibrutinib were used. The primary goal of the study was to determine the safety of the low and high doses; secondary objectives included efficacy, measures of the intensity of the drug's effect in the body, and the long-term safety of administering this therapy continuously until relapse.

The study found that response to therapy was high across the cohorts, with largely manageable toxicities. Previously untreated elderly patients responded best to the agent, with 71 percent experiencing a complete or partial response at either treatment dose. The same response was observed in 67 percent of the relapsed patients and 50 percent 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.

The treatment regimen was generally well-tolerated, as only non-severe side effects were observed, including diarrhea, fatigue, chest infection, rash, nausea, joint pain, and infrequent and transient low blood counts. Investigators found no evidence of cumulative toxicity or long-term safety concerns with a median follow-up of 16 months for treated patients. These results demonstrate ibrutinib's potential as a highly active, well-tolerated first-line therapy for CLL.

"As we learn more about how to target specific essential survival signa
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Contact: Andrea Slesinski
aslesinski@hematology.org
614-352-5096
American Society of Hematology
Source:Eurekalert

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