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The US Food and Drug Administration (FDA) has granted full approval for the kinase inhibitor ponatinib (Iclusig®) and updated the drug’s label.
Ponatinib now has full approval as a treatment for adults with chronic myeloid leukemia (CML) or Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph+ ALL) when no other tyrosine kinase inhibitor is indicated.
Ponatinib is also approved to treat adults with T315I-positive CML or T315I-positive Ph+ ALL.
Ponatinib was initially approved in December 2012 under the FDA’s accelerated approval program.
This program allows the FDA to approve a drug to treat a serious or life-threatening disease based on clinical data showing the drug has an effect on a surrogate endpoint reasonably likely to predict clinical benefit to patients.
The company developing the drug must conduct post-approval research to determine if the drug provides a clinical benefit. If so, the drug can be granted full approval.
The full approval and label update for ponatinib is based on 48-month follow-up data (as of August 2015) from the phase 2 PACE trial, which enrolled heavily pretreated patients with resistant or intolerant CML or Ph+ ALL. These data were presented at the 2016 ASCO Annual Meeting.
“The longer follow up of the PACE study confirms the clinical benefit of ponatinib in this setting,” said Jorge Cortes, MD, a professor at The University of Texas MD Anderson Cancer Center in Houston and a leading investigator in the PACE trial.
“We had learned from the initial report of the high response rate with ponatinib among CML patients with resistance or intolerance to prior therapies. The 4-year follow-up and updated safety profile demonstrate durability of responses in this heavily pretreated population. These results solidify ponatinib as an important and valuable treatment option for refractory patients with CML where no other TKI therapy is appropriate, including those who have the T315I mutation.”
Past problems with ponatinib
Previous follow-up data from the PACE trial, collected in 2013, suggested ponatinib can increase the risk of thrombotic events. When these data came to light, officials in the US and European Union, where ponatinib had already been approved, began to investigate the drug.
Ponatinib was pulled from the US market for a little over 2 months, and trials of the drug were placed on partial hold while the FDA evaluated the drug’s safety. Ponatinib went back on the market in January 2014, with new safety measures in place.
Ponatinib was not pulled from the market in the European Union, but the European Medicine’s Agency released recommendations for safer use of the drug. The Committee for Medicinal Products for Human Use reviewed data on ponatinib and decided its benefits outweigh its risks.
