EATG » ContraVir receives HBV IND approval for tenofovir exalidex (TXL™) in the US

ContraVir receives HBV IND approval for tenofovir exalidex (TXL™) in the US

EDISON, N.J., Sept. 11, 2017 — ContraVir Pharmaceuticals, Inc. (NASDAQ:CTRV), a biopharmaceutical company focused on the development and commercialization of targeted antiviral therapies, announced today that the U.S. Food and Drug Administration (FDA) has approved an Investigational New Drug (IND) Application in the U.S. for its lead HBV compound, TXL™ for the treatment of chronic hepatitis B.

Earlier this year, ContraVir announced that it had completed a Phase 1, multiple dose study in healthy subjects and a Phase 2a, 28 day study in HBV-infected patients. These studies were conducted in Thailand, a country with a high prevalence of chronic HBV infection. Having successfully achieved proof-of-concept, ContraVir intends to expand the TXL™ clinical program and initiate its first US-based clinical trial for TXL™ in the fourth quarter of 2017, pending approval by the Institutional Review Board. The study will enroll patients with severe renal impairment, and thus will generate data which we believe will further support the favorable safety profile of TXL™.

“While we already have an existing open IND for TXL™ in HIV, the approval of the IND for TXL™ in HBV, is a significant step to further drive the expansion of our development program,” said James Sapirstein, Chief Executive Officer of ContraVir. “We are particularly excited about this news, as it broadens the reach of our clinical program and allows us to conduct co-development programs in the U.S. for patients with both HIV and HBV infection.”

About TXL™

Tenofovir exalidex (TXL™) is a highly potent prodrug of the antiviral tenofovir.  Tenofovir is the active component of both Vemlidy (tenofovir alafenamide) and Viread® (tenofovir disoproxil fumarate).TXL’s novel liver-targeting prodrug structure results in decreased systemic circulating levels of tenofovir, thereby reducing the potential for renal and bone side effects. ContraVir has completed a Phase 2 trial of TXL™, in which HBV-infected subjects were administered doses up to 100 mg for 28 days and is now optimizing its formulation to further enhance drug delivery. To date, TXL™ has achieved clinical proof of concept for antiviral activity and displayed an excellent safety, tolerability, and pharmacokinetic profile. Based on the agent’s best-in-class potential, ContraVir believes TXL™ can become the cornerstone of a curative combination therapy for hepatitis B.

About ContraVir Pharmaceuticals

ContraVir is a biopharmaceutical company focused on the development and commercialization of targeted antiviral therapies with a specific focus on developing a potentially curative therapy for hepatitis B virus (HBV). The Company is developing two novel anti-HBV compounds with complementary mechanisms of action. TXL™ currently in Phase 2, is designed to deliver high intrahepatic concentrations of TFV, while minimizing off-target effects caused by high levels of circulating TFV. CRV431, the other anti-HBV compound, is a next-generation cyclophilin inhibitor with a unique structure that increases its potency and selective index against HBV. ContraVir is also developing Valnivudine™, an orally available nucleoside analogue prodrug; Valnivudine™ is currently in Phase 3 for the treatment of herpes zoster. In addition to direct antiviral activity, Phase 2 data suggest that Valnivudine™ has the potential to reduce the incidence of debilitating shingles-associated pain known as post-herpetic neuralgia (PHN). For more information visit