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FDA Approves New Treatment for Highly Drug-Resistant Forms of Tuberculosis


News provided by

TB Alliance

14 Aug, 2019, 17:11 GMT

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Pretomanid, developed by the non-profit TB Alliance, has received U.S. approval in combination regimen with bedaquiline and linezolid for people with XDR-TB or treatment-intolerant/non-responsive MDR-TB

NEW YORK, Aug. 14, 2019 /PRNewswire/ -- Pretomanid, a novel compound developed by the non-profit organization TB Alliance, was approved by the U.S. Food & Drug Administration (FDA) today for treating some of the most drug-resistant forms of tuberculosis (TB).1 The new drug was approved under the Limited Population Pathway for Antibacterial and Antifungal Drugs (LPAD pathway) as part of a three-drug, six-month, all-oral regimen for the treatment of people with extensively drug-resistant TB (XDR-TB) or multidrug-resistant TB (MDR-TB) who are treatment-intolerant or non-responsive (collectively "highly drug-resistant TB").1,2

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Pretomanid tablet, pictured, is a new drug developed by the non-profit TB Alliance for the treatment of highly drug-resistant forms of tuberculosis as part of a combination therapy.

The LPAD pathway was established by FDA as a tool to encourage further development of antibacterial and antifungal drugs to treat serious, life-threatening infections that affect a limited population of patients with unmet needs.

"FDA approval of this treatment represents a victory for the people suffering from these highly drug-resistant forms of the world's deadliest infectious disease," said Mel Spigelman, MD, president and CEO of TB Alliance. "The associated novel regimen will hopefully provide a shorter, more easily manageable and highly efficacious treatment for those in need."

The three-drug regimen consisting of bedaquiline, pretomanid and linezolid – collectively referred to as the BPaL regimen – was studied in the pivotal Nix-TB trial across three sites in South Africa. The trial enrolled 109 people with XDR-TB as well as treatment-intolerant or non-responsive MDR-TB.2

Nix-TB data have demonstrated a successful outcome in 95 of the first 107 patients after six months of treatment with BPaL and six months of post-treatment follow-up.2 For two patients, treatment was extended to nine months. The new drug application contains data on 1,168 people who have received pretomanid in 19 clinical trials that have evaluated the drug's safety and efficacy.2 Pretomanid has been clinically studied in 14 countries.

TB, in all forms, must be treated with a combination of drugs; the most drug-sensitive forms of TB require six months of treatment using four anti-TB drugs.3 Treatment of XDR-TB or treatment intolerant/non-responsive MDR-TB has historically been lengthy and complex; most XDR-TB patients currently take a combination of as many as eight antibiotics, some involving daily injections, for 18 months or longer.3,4 Prior to recent introduction of new drugs for drug-resistant TB, the World Health Organization (WHO) has reported estimates for treatment success rates of XDR-TB therapy at approximately 34 percent and about 55 percent for MDR-TB therapy.4

­"Until very recently, people infected with highly drug-resistant TB had poor treatment options and a poor prognosis," said Dr. Francesca Conradie, principal investigator of the Nix-TB trial. "This new regimen provides hope with 9 out of 10 patients achieving culture negative status at 6 months post-treatment with this short, all-oral regimen."

Pretomanid is a new chemical entity and a member of a class of compounds known as nitroimidazooxazines. TB Alliance acquired the developmental rights to the compound in 2002. It has been developed as an oral tablet formulation for the treatment of TB in combination with bedaquiline and linezolid, two other anti-TB agents, and is now indicated for use in a limited and specific population of patients.1 Adverse reactions reported during the Nix-TB trial of the BPaL regimen include hepatotoxicity, myelosuppression, as well as peripheral and optic neuropathy. 1 Please see additional safety information in the Important Safety Information below and in the accompanying pretomanid Full Prescribing Information.

Pretomanid is only the third new anti-TB drug approved for use by FDA in more than 40 years, as well as the first to be developed and registered by a not-for-profit organization.5,6 Pretomanid was granted Priority Review, Qualified Infectious Disease Product, and Orphan Drug status. As a product development partnership, TB Alliance has collaborated with and received significant support from numerous governments, academia, philanthropic institutions, the private sector, civil society organizations and other partners over the course of pretomanid's development.

Pretomanid is expected to be available in the United States by the end of this year. In addition to the U.S. FDA, TB Alliance has submitted pretomanid as part of the BPaL regimen for review by the European Medicines Agency and has provided data to the World Health Organization for consideration of inclusion in treatment guidelines for highly drug-resistant TB.

INDICATION

Limited Population: Pretomanid Tablet is an antimycobacterial indicated, as part of a combination regimen with bedaquiline and linezolid for the treatment of adults with pulmonary extensively drug-resistant (XDR), treatment-intolerant or non-responsive multidrug-resistant (MDR) tuberculosis (TB). Approval of this indication is based on limited clinical safety and efficacy data. This drug is indicated for use in a limited and specific population of patients.

Limitations of Use:

  • Pretomanid Tablets are not indicated for patients with:
    • Drug-sensitive (DS) tuberculosis
    • Latent infection due to Mycobacterium tuberculosis
    • Extra-pulmonary infection due to Mycobacterium tuberculosis
    • MDR-TB that is not treatment-intolerant or non-responsive to standard therapy
  • Safety and effectiveness of Pretomanid Tablets have not been established for its use in combination with drugs other than bedaquiline and linezolid as part of the recommended dosing regimen.

IMPORTANT SAFETY INFORMATION

Contraindications
Pretomanid Tablets used in combination with bedaquiline and linezolid are contraindicated in patients for whom bedaquiline and/or linezolid is contraindicated.

Warnings and Precautions

  • Hepatic adverse reactions were reported with the use of the combination regimen of Pretomanid Tablets, bedaquiline, and linezolid. Monitor symptoms and signs and liver‑related laboratory tests. Interrupt treatment with the entire regimen if evidence of liver injury occurs.
  • Myelosuppression was reported with the use of the combination regimen of Pretomanid Tablets, bedaquiline, and linezolid. Monitor complete blood counts. Decrease or interrupt linezolid dosing if significant myelosuppression develops or worsens.
  • Peripheral and optic neuropathy were reported with the use of the combination regimen of Pretomanid Tablets, bedaquiline, and linezolid. Monitor visual function. Obtain an ophthalmologic evaluation if there are symptoms of visual impairment. Decrease or interrupt linezolid dosing if neuropathy develops or worsens.
  • QT prolongation was reported with the use of the combination regimen of Pretomanid Tablets, bedaquiline, and linezolid. Use with drugs that prolong the QT interval may cause additive QT prolongation. Monitor ECGs. Discontinue the combination regimen of Pretomanid Tablets, bedaquiline, and linezolid if significant ventricular arrhythmia or if QTcF interval prolongation of greater than 500 ms develops.
  • Reproductive effects: Pretomanid caused testicular atrophy and impaired fertility in male rats. Advise patients of reproductive toxicities seen in animal studies and that the potential effects on human male fertility have not been adequately evaluated.
  • Lactic acidosis was reported with the use of the combination regimen of Pretomanid Tablets, bedaquiline, and linezolid. Consider interrupting linezolid or the entire combination regimen of Pretomanid Tablets, bedaquiline, and linezolid dosing if significant lactic acidosis develops.

Adverse Reactions
Most common adverse reactions (≥10%) are peripheral neuropathy, acne, anemia, nausea, vomiting, headache, increased transaminases, dyspepsia, decreased appetite, rash, pruritus, abdominal pain, pleuritic pain, increased gamma-glutamyltransferase, lower respiratory tract infection, hyperamylasemia, hemoptysis, back pain, cough, visual impairment, hypoglycemia, abnormal loss of weight, and diarrhea.

Please see Full Prescribing Information at www.tballiance.org/pretomanid

About Tuberculosis
Tuberculosis is a global disease, found in every country in the world. It is the leading infectious cause of death worldwide. In 2017, 10 million people fell ill from active TB and 1.6 million died. It is an airborne disease that can be spread by coughing or sneezing. There are more than half a million cases of MDR-TB annually, with about 6% of those cases being XDR-TB. Current WHO figures report that 127 countries have reported cases of XDR-TB. Drug-resistant forms of TB currently accounts for close to 1 in 3 deaths due to antimicrobial resistance annually.

About TB Alliance
TB Alliance (The Global Alliance for TB Drug Development, Inc.) is a not-for-profit organization dedicated to finding faster-acting and affordable drug regimens to fight TB. Through innovative science and with partners around the globe, we aim to ensure equitable access to faster, better TB cures that will advance global health and prosperity. TB Alliance operates with support from Australia's Department of Foreign Affairs and Trade, Bill & Melinda Gates Foundation, Cystic Fibrosis Foundation, European & Developing Countries Clinical Trials Partnership, Germany's Federal Ministry of Education and Research through KfW, Global Health Innovative Technology Fund, Indonesia Health Fund, Irish Aid, Medical Research Council (United Kingdom), National Institute of Allergy and Infectious Disease, Netherlands Ministry of Foreign Affairs, United Kingdom Department for International Development, and the United States Agency for International Development.

For more information on the pretomanid application and regulatory approval process, please visit:

  • TB Medicine Pretomanid Enters Regulatory Review Process in the United States (press release)
  • TB Alliance and Mylan Announce Global Collaboration to Commercialize Investigational Drug Pretomanid as Part of Two Regimens to Treat Tuberculosis (press release)
  • FDA Advisory Committee Votes Favorably on the Question of the Effectiveness and Safety of Pretomanid in Combination with Bedaquiline and Linezolid for Treatment of Highly Drug-Resistant Forms of Tuberculosis (press release)

1 Pretomanid and BPaL. Full Prescribing Information. August 2019.
2 TB Alliance. Pretomanid and BPaL Regimen for Treatment of Highly Resistant Tuberculosis. Oral presentation at: Antimicrobial Drugs Advisory Committee; June 6, 2019; Silver Spring, MD.
3 The Review on Antimicrobial Resistance. Tackling Drug- Resistant Infections Globally. May 2016.
4 World Health Organization (WHO). Global TB Report 2018.
5 Fox W. Studies on the treatment of tuberculosis undertaken by the British Medical Research Council Tuberculosis Units. Int J Tuberc Lung Dis. 1999;3(10):S231-S279.
6 U.S. Food and Drug Administration. Drug Approvals and Databases. Available at: https://www.fda.gov/drugs/development-approval-process-drugs/drug-approvals-and-databases

Photo - https://mma.prnewswire.com/media/960210/2019_02_15_14_43_26.jpg

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