Mutations in two genes often occurred months before relapse of chronic lymphocytic leukemia (CLL) treated with ibrutinib (Imbruvica), suggesting potential as a cue for alternative therapy, according to a retrospective review of four clinical trials.
Among patients who had CLL relapse, acquired mutations in BTK and PLCG2 occurred in 85% of cases. The mutations arose a median of 9.3 months prior to overt disease relapse, reported Jennifer A. Woyach, MD, of Ohio State University in Columbus, and colleagues.
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