FDA Safety Review on Gilead’s Zydelig After Triall Deaths
FDA says it is evaluating the safety of Gilead Sciences 2014-approved Zydelig (idelalisib), indicated for treating patients with three types of blood cancers, after receiving reports of deaths in clinical trials involving the drug. “The safety of patients is a top priority and the FDA will communicate new safety-related information on Zydelig as it becomes available,” an agency spokeswoman told FDA Webview 3/11. “The FDA urges health care professionals and patients to report adverse events involving Zydelig to the FDA MedWatch program,” she said. “Patients should talk with their doctor if they have concerns about any drug they are prescribed and its risks.”
FDA’s acknowledgment of the safety review comes on the heels of an EMA 3/11 notice announcing a similar safety review in Europe. “The review has been started because an increased rate of serious adverse events including deaths, mostly due to infections, was seen in three clinical trials investigating the medicine in combination with other cancer medicines,” EMA said. “The clinical trials involved patients with chronic lymphocytic leukaemia and indolent non-Hodgkin lymphoma. However, the study in chronic lymphocytic leukaemia investigated combinations of medicines that are currently not approved and the studies in non-Hodgkin lymphoma included patients with disease characteristics different from those covered by the currently approved indications. Investigators of all clinical trials involving Zydelig are currently being informed of the actions to be taken in relation to the conduct of ongoing studies.”
In 2014, FDA granted the drug traditional approval to treat patients whose chronic lymphocytic leukemia has relapsed, and accelerated approval to treat patients with relapsed follicular B-cell non-Hodgkin lymphoma and relapsed small lymphocytic lymphoma. The approval required a boxed warning alerting patients and health care professionals to fatal and serious toxicities including liver toxicity, diarrhea and colon inflammation (colitis), lung inflammation (pneumonitis) and intestinal perforation that can occur in Zydelig-treated patients, FDA said at the time. Zydelig also has a Risk Evaluation and Mitigation Strategy comprised of a communication plan to ensure healthcare providers who are likely to prescribe Zydelig are fully informed about these risks.