The Food and Drug Administration has given full approval for ibrutinib (Imbruvica) for patients with chronic lymphocytic leukemia who have received at least one prior therapy and for those who have a deletion in chromosome 17 (17p deletion) and may or may not have received previous treatment.
The drug received conditional, accelerated approval from the FDA in February for CLL. The agency said that new trial results that looked at overall survival and progression-free survival confirmed the drug’s benefit. Ibrutinib’s label will be updated to show that it has a confirmed survival benefit.
The FDA also designated ibrutinib as a breakthrough therapy for CLL with 17p deletion.
"Imbruvica is the fourth drug approved to treat CLL that received a breakthrough therapy designation, reflecting the promise of the breakthrough therapy designation program and demonstrating the FDA’s commitment to working cooperatively with companies to expedite the development, review, and approval of these important new drugs," said Dr. Richard Pazdur, director of the Office of Hematology and Oncology Products in the FDA’s Center for Drug Evaluation and Research, in a statement.
"This FDA approval for Imbruvica is a major step toward chemo-free treatment in CLL," said Dr. John Byrd, director of the hematology division at the Ohio State University Comprehensive Cancer Center, Columbus, in a statement issued by Pharmacyclics, the Sunnyvale, Calif.–based company that is comarketing the drug with Janssen Biotech.
"I continue to be awed by the duration of my patients’ responses to Imbruvica and am grateful Imbruvica now is available to a broader group of CLL patients," said Dr. Byrd, who was a lead investigator for the main trial evaluating ibrutinib, RESONATE.
Three other drugs for CLL have also received breakthrough designations: obinutuzumab (Gazyva), ofatumumab (Arzerra), and most recently, idelalisib (Zydelig), earlier in July.
CLL is a non-Hodgkin’s lymphoma that primarily affects older individuals. The National Cancer Institute estimates that 15,720 Americans will be diagnosed and 4,600 will die from CLL in 2014, the FDA said.
In RESONATE, 391 previously treated patients received either ibrutinib or ofatumumab. Of those, 127 patients had a 17p deletion. The trial was stopped early because overall, patients receiving ibrutinib had a 78% reduction in the risk of disease progression or death, and a 57% reduction in risk of death. For the patients with 17p, there was a 75% reduction in the risk of disease progression or death.
This is the third FDA approval for ibrutinib. In addition to the accelerated approval for CLL in February, the drug was approved for mantle cell lymphoma in November 2013.
Dr. Byrd has served as an unpaid adviser to both Pharmacyclics and Janssen. He reported no financial interest in either company.
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