Gemtuzumab Ozogamicin [Mylotarg]: Market Withdrawal

Last Updated on June 22, 2010 by Joseph Gut – thasso

June 21, 2010 –  FDA notified healthcare professionals that results from a recent clinical trial raised new concerns about the product’s safety, and the drug failed to demonstrate clinical benefit to patients enrolled in trials.


Gemtuzumab Ozogamicin [Mylotarg], indicated for treatment of acute myeloid leukemia (AML), a bone marrow cancer, was approved in May 2000 under the FDA’s accelerated approval program. A confirmatory, post approval clinical trial was begun by Wyeth (now Pfizer) in 2004. The trial was designed to determine whether adding Gemtuzumab Ozogamicin [Mylotarg] to standard chemotherapy demonstrated an improvement in clinical benefit (survival time) to AML patients. The trial was stopped early when no improvement in clinical benefit was observed, and after a greater number of deaths occurred in the group of patients who received Gemtuzumab Ozogamicin [Mylotarg] compared with those receiving chemotherapy alone.


Gemtuzumab Ozogamicin [Mylotarg] will not be commercially available to new patients. Patients who are currently receiving the drug may complete their therapy following consultation with their health care professional. Health care professionals should inform all patients receiving Gemtuzumab Ozogamicin [Mylotarg] of the product’s potential safety risks. Any future use of Gemtuzumab Ozogamicin [Mylotarg] in the United States will require submission of an investigational new drug application to the FDA.

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Ph.D.; Professor in Pharmacology and Toxicology. Senior expert in theragenomic and personalized medicine and individualized drug safety. Senior expert in pharmaco- and toxicogenetics. Senior expert in human safety of drugs, chemicals, environmental pollutants, and dietary ingredients.