Arrowhead Files IND for RNAi Therapeutic ARC-520 to Begin Phase 2b Multiple-Dose Studies in Chronic Hepatitis B Patients

PASADENA, Calif.–(BUSINESS WIRE)–

Arrowhead Research Corporation (NASDAQ: ARWR), a biopharmaceutical

company developing targeted RNAi therapeutics, today announced that it

submitted an Investigational New Drug (IND) application to the U.S. Food

and Drug Administration for ARC-520, it’s drug candidate for the

treatment of chronic hepatitis B virus (HBV) infection. Arrowhead plans

to submit additional clinical trial authorization applications with

regulatory authorities in various jurisdictions in Europe and Asia.

Pending national regulatory review and approval, Arrowhead intends to

initiate two Phase 2b, multicenter, randomized, double-blind,

placebo-controlled, multi-dose studies to determine the depth of

hepatitis B surface antigen (HBsAg) reduction following ARC-520

injection in combination with entecavir or tenofovir in patients with

chronic immune active HBV infection. The Heparc-2002 study is planned to

include patients who are negative for hepatitis B e-antigen (HBeAg) at

screening and the Heparc-2003 study is planned to include patients who

are positive for HBeAg at screening. The primary objective is to

evaluate the depth of HBsAg decline in response to multiple doses of

ARC-520 compared to placebo in patients with chronic HBV infection as a

measure of drug activity. Secondary objectives are to assess measures of

safety and tolerability and to evaluate multi-dose pharmacokinetics of

ARC-520 in patients with chronic HBV infection when co-administered with

a fixed dose of entecavir or tenofovir, in addition to other exploratory

safety and pharmacodynamic objectives.

“As with our recent application to begin a Phase 1 study with ARC-AAT,

this IND represents achievement of a key 2014 goal,” said Arrowhead

President and CEO, Dr. Christopher Anzalone. “We look forward to

beginning multi-dose studies with ARC-520.”

About ARC-520

Arrowhead’s RNAi-based candidate ARC-520 is being investigated in the

treatment of chronic HBV infection. The small interfering RNAs (siRNAs)

in ARC-520 intervene at the mRNA level, upstream of the reverse

transcription process where current standard of care nucleotide and

nucleoside analogues act. Arrowhead is investigating ARC-520

specifically, to determine if it can be used to achieve a functional

cure, which is an immune clearant state characterized by hepatitis B

s-antigen negative serum with or without sero-conversion. Arrowhead has

completed a Phase 1 single ascending dose study in normal volunteers and

the company is conducting a single dose Phase 2a study in chronic HBV

patients. Approximately 350-400 million people worldwide are chronically

infected with the hepatitis B virus, which can lead to cirrhosis of the

liver and is responsible for 80% of primary liver cancers globally.

About Arrowhead Research Corporation

Arrowhead Research Corporation is a biopharmaceutical company developing

targeted RNAi therapeutics. The company is leveraging its proprietary

Dynamic Polyconjugate™ delivery platform to develop targeted drugs based

on the RNA interference mechanism that efficiently silences

disease-causing genes. Arrowhead’s pipeline includes ARC-520 for chronic

hepatitis B virus, ARC-AAT for liver disease associated with Alpha-1

antitrypsin deficiency, and partner-based programs in obesity and

oncology.

For more information please visit http://www.arrowheadresearch.com,

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Act:

This news release contains forward-looking statements within the

meaning of the “safe harbor” provisions of the Private Securities

Litigation Reform Act of 1995. These statements are based upon our

current expectations and speak only as of the date hereof. Our actual

results may differ materially and adversely from those expressed in any

forward-looking statements as a result of various factors and

uncertainties, including our ability to finance our operations, the

future success of our scientific studies, our ability to successfully

develop drug candidates, the timing for starting and completing clinical

trials, actions of the U.S. Food and Drug Administration (FDA) and

similar global regulatory bodies, rapid technological change in our

markets, and the enforcement of our intellectual property rights.

Arrowhead Research Corporation’s most recent Annual Report on Form 10-K

and subsequent Quarterly Reports on Form 10-Q discuss some of the

important risk factors that may affect our business, results of

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revise forward-looking statements to reflect new events or circumstances.

Source: Arrowhead Research Corporation

Arrowhead Research Corporation
Vince Anzalone, CFA, 626-304-3400
ir@arrowres.com
or
Investor

Relations:
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Lauren Glaser, 646-378-2972
ir@arrowres.com
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Martina Schwarzkopf, Ph.D., 212-845-4292
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Source: Arrowhead Research Corporation

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