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Leqembi, an Alzheimer’s disease treatment. FDA grants accelerated approval


The U.S. Food and Drug Administration ( FDA ) has approved Leqembi ( Lecanemab-irmb; Lecanemab ) via the Accelerated Approval pathway for the treatment of Alzheimer’s disease.
Leqembi is the second of a new category of medications approved for Alzheimer’s disease that target the fundamental pathophysiology of the disease.

Alzheimer’s disease is an irreversible, progressive brain disorder affecting more than 6.5 million Americans that slowly destroys memory and thinking skills and, eventually, the ability to carry out simple tasks.
While the specific causes of Alzheimer’s are not fully known, it is characterized by changes in the brain, including amyloid beta plaques and neurofibrillary, or tau, tangles, that result in loss of neurons and their connections. These changes affect a person’s ability to remember and think.

Leqembi was approved using the Accelerated Approval pathway, under which the FDA may approve drugs for serious conditions where there is an unmet medical need and a drug is shown to have an effect on a surrogate endpoint that is reasonably likely to predict a clinical benefit to patients.
The results of a phase 3 randomized, controlled clinical trial to confirm the drug's clinical benefit have recently been reported and the agency anticipates receiving the data soon.

Researchers have evaluated Leqembi’s efficacy in a double-blind, placebo-controlled, parallel-group, dose-finding study of 856 patients with Alzheimer’s disease.
Treatment was initiated in patients with mild cognitive impairment or mild dementia stage of disease and confirmed presence of amyloid beta pathology.
Patients receiving the treatment had significant dose- and time-dependent reduction of amyloid beta plaque, with patients receiving the approved dose of Lecanemab, 10 milligram/kilogram every two weeks, having a statistically significant reduction in brain amyloid plaque from baseline to week 79 compared to the placebo arm, which had no reduction of amyloid beta plaque.

These results have supported the accelerated approval of Leqembi, which is based on the observed reduction of amyloid beta plaque, a marker of Alzheimer’s disease.
Amyloid beta plaque was quantified using positron emission tomography ( PET ) imaging to estimate the brain levels of amyloid beta plaque in a composite of brain regions expected to be widely affected by Alzheimer’s disease pathology compared to a brain region expected to be spared of such pathology.

The prescribing information for Leqembi includes a warning for amyloid-related imaging abnormalities ( ARIA ), which are known to occur with antibodies of this class.
ARIA usually does not have symptoms, although serious and life-threatening events rarely may occur. ARIA most commonly presents as temporary swelling in areas of the brain that usually resolves over time and may be accompanied by small spots of bleeding in or on the surface of the brain, though some people may have symptoms such as headache, confusion, dizziness, vision changes, nausea and seizure.
Another warning for Leqembi is for a risk of infusion-related reactions, with symptoms such as flu-like symptoms, nausea, vomiting and changes in blood pressure.
The most common side effects of Leqembi were infusion-related reactions, headache and ARIA.

As specified in the prescribing information, Leqembi is indicated for the treatment of Alzheimer’s disease. The labeling states that treatment with Leqembi should be initiated in patients with mild cognitive impairment or mild dementia stage of disease, the population in which treatment was studied in clinical trials.
The labeling also states that there are no safety or effectiveness data on initiating treatment at earlier or later stages of the disease than were studied. ( Xagena )

Source: FDA, 2023

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