Obinutuzumab is and FDA Breakthrough Therapy for Life-Threatening Conditions

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On November 1st 2013, the U.S. Food and Drug Administration (FDA) granted approval to obinutuzumab (previously known as GA101), a CD20-directed cytolytic antibody for use in combination with chlorambucil for treating patients with previously untreated chronic lymphocytic leukemia (CLL) (1). Obinutuzumab is unique because it is the first drug approved with the FDA’s Breakthrough Therapy designation, since the agency began using that designation in 2012 as per the requirements in the Food and Drug Administration Safety and Innovation Act (FDA SIA). Chronic lymphocytic leukemia (CLL) is the most common leukemia in the Western world with an annual incidence of 4.2/100 000 population (2). The incidence increases to >30/100 000/year at an age of more than 80 years. The median age at diagnosis is 72 years. About 10% of CLL patients are reported to be younger than 55 years of age.

Breakthrough Therapy designation aims to expedite the development of drugs for serious or life-threatening conditions. The criteria for this designation require preliminary clinical evidence that demonstrates the new drug having substantial improvement on one or more clinically significant endpoints over available therapy. Determination of whether the advantage over existing therapy is substantial is a matter of judgment and depends upon both the magnitude of the therapeutic effect, including its duration and the clinical importance of the observed outcomes. In general, the preliminary clinical evidence should show a definite advantage over the available therapy. What differentiates the breakthrough therapy designation from other FDA approaches to expedited drug development including fast track designation, priority review and accelerated approval —all of wh...

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...ons to minimize the risk of infusion related hypersensitivity reactions. These premedications include a glucocorticoid, acetaminophen and an anti-histamine.

The drug is approved with a boxed warnings about Hepatitis B virus (HBV) reactivation and progressive multifocal leukoencephalopathy (PML), either of which may be fatal. HBV reactivation can possibly result in fulminant hepatitis, hepatic failure, and death. It is recommended to screen all patients for HBV infection before initiating treatment and to monitor HBV positive patients during and after treatment with this drug. PML is suspected in any patient presenting with new onset or changes to prior neurologic manifestations. Development of PML in obinutuzunab treated patients warrants discontinuation of this drug as well as stoppage/ dose reduction of any concomitant chemotherapy or immunosuppressive therapy.

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