Release date: 2017-06-05 Alnylam Pharmaceuticals, a leading RNAi treatment company, recently announced that its new drug, givosiran, has received a FDA-issued breakthrough therapy. Givosiran is an RNAi therapy against aminolevulinic acid synthase 1 (ALAS1) for the prevention of acute hepatic porphyria (AHP). Acute Hepatic Porphyrias (AHP) is a rare metabolic disorder, mainly autosomal dominant, caused by a genetic mutation in one of the eight enzymes responsible for heme synthesis. Acute hepatic porphyria includes several subtypes: acute intermittent porphyria (AIP), hereditary porphyria (HCP), and variegate porphyria (VP). AHP patients who are exposed to certain drugs, foods, or hormonal changes strongly induce an enzyme in the heme biosynthetic pathway, aminolevulinate synthase 1 (ALAS1), which results in a neurotoxic heme intermediate. Accumulate, causing the onset of the disease. AHP patients develop a range of life-threatening symptoms, such as severe abdominal pain, peripheral and autonomic neuropathy, neuropsychiatric symptoms, and skin damage that can lead to paralysis and death if left untreated or treated. The treatment to prevent the onset of AHP has not yet been approved. The only approved acute episode is hemoglobin for injection (Panhematin® or Normosang®), a heme preparation derived from human blood. Heme needs to be treated by large or central vein injection and is associated with many complications, including thrombophlebitis or coagulopathy. Givosiran is an RNA interference (RNAi) therapy targeting ALAS1. It has been approved by the European Medicines Agency (EMA) PRIME, as well as the orphan drug in the European Union and the United States. It is used to treat acute hepatic porphyria and has the potential to become A new treatment for preventing recurrence. RNAi is a new approach to drug discovery and development that uses small interfering RNA (siRNA) molecules to target specific mRNAs and silence them to prevent the production of pathogenic proteins. RNAi therapy has the potential to cure diseases radically. Its findings are considered to be “a major scientific breakthrough that occurs only once every decade†and are one of the frontiers of rapid development in biology and drug discovery today, and were awarded the 2006 Nobel Prize in Physiology or Medicine. ▲ RNAi mechanism of action (Source: Alnylam official website) Preliminary clinical studies have shown that givosiran can effectively reduce the incidence of porphyria, and the FDA has issued a breakthrough therapy. The study was a randomized, double-blind, placebo-controlled phase 1 clinical trial. Data published at the 2016 American Society of Hematology (ASH) meeting showed that givosiran is effective in reducing the frequency and frequency of porphyria attacks and effectively reducing the annual hemoglobin dose required for patients with acute intermittent porphyria (AIP). AIP is the most common and severe form of AHP. Alnylam will announce more results from the trial at the International Conference on Porphyrin and Porphyria (ICPP) in Bordeaux, France on June 26, 2017. "Acute hepatic porphyria is a super rare disease, and patients with severe neurological visceral injuries often require hospitalization, and chronic, debilitating symptoms can impair human function." Mr. Jeff Miller, vice president of Alnylam and general manager of the givosiran project “We believe that givosiran may be a transformative treatment for patients with this devastating and potentially life-threatening disease. Therefore, we look forward to working with global regulators to move the program quickly,†said. Source: WuXi PharmaTech (WeChat: WuXiAppTecChina)
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