Arrowhead to Present at Upcoming Conferences

PASADENA, Calif.–(BUSINESS WIRE)–

Arrowhead Research Corporation (NASDAQ: ARWR), a biopharmaceutical

company developing targeted RNAi therapeutics, today announced that the

company will make presentations at the following upcoming events.

The Liver Meeting 2015®, 66th Annual Meeting

of the American Association for the Study of Liver Disease (AASLD)

San Francisco, November 13-17, 2015

November 15, 3:15 p.m. PST – Christine Wooddell, Ph.D., Arrowhead

group leader will deliver an oral presentation titled, “Reductions in

cccDNA under NUC and ARC-520 therapy in chimpanzees with chronic

hepatitis B virus infection implicate integrated DNA in maintaining

circulating HBsAg

November 16, 8:00 a.m. – 5:30 p.m. PST – Man-Fung Yuen, M.D.,

Ph.D., chair of gastroenterology and hepatology, The University of Hong

Kong, and deputy chief of service, Queen Mary Hospital department of

medicine, Hong Kong, will deliver a late-breaking poster presentation

titled, “ARC-520 produces deep and durable knockdown of viral

antigens and DNA in a phase II study in patients with chronic hepatitis B

November 16, 6:30 p.m. PST – Arrowhead management will host an Analyst

and Investor Reception to discuss ARC-520 and key data being

presented at the conference

November 17, 8:00 a.m. – 12:00 p.m. PST – Christine Wooddell,

Ph.D., Arrowhead group leader will deliver a poster presentation titled,

Monthly dosing of ARC-520 in chronically hepatitis B virus infected

chimpanzees produces rapid, deep and durable reductions in circulating

viral antigens

Jefferies Autumn 2015 Global Healthcare Conference – London, UK,

November 18-19, 2015

November 19, 2:40 p.m. GMT – Chris Anzalone, Ph.D., Arrowhead

president and chief executive officer, will present a company overview

Piper Jaffray 27th Annual Healthcare Conference – New York,

December 1-2, 2015

December 2, 3:00 p.m. EST – Chris Anzalone, Ph.D., Arrowhead

president and chief executive officer, will present a company overview

in a fireside chat with Ted Tenthoff, senior research analyst, Piper

Jaffray

HEP DART 2015 – Wailea, Hawaii, December 6-10, 2015

December 2, 6:40 p.m. HST – Bruce Given, M.D., Arrowhead chief

operating officer, will deliver an oral presentation titled, “New

insights on HBV biology from the ARC-520 development program

December 8, 4:00 – 5:30 p.m. HST – Christine Wooddell, Ph.D.,

Arrowhead group leader will deliver a poster presentation titled, “Sustained

reduction in HBsAg, HBV DNA and HBeAg seroconversion in a chronically

HBV-infected chimpanzee treated with nucleoside analog/ARC-520

combination therapy

Links to the webcasts and copies of presentation materials, if

available, can be accessed by visiting the Events section of the

company’s website at http://ir.arrowheadresearch.com/events.cfm.

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 is

conducting Phase 2b multiple dose and combination studies 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 and ARC-521

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

alpha-1 antitrypsin deficiency, ARC-F12 for hereditary angioedema and

thromboembolic diseases, and ARC-HIF2 for renal cell carcinoma.

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

or follow us on Twitter @ArrowRes.

To be added to the Company’s email list and receive news directly,

please visit http://ir.arrowheadresearch.com/alerts.cfm.

Safe Harbor Statement under the Private Securities Litigation Reform

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, 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 operations and financial condition. We assume

no obligation to update or revise forward-looking statements to reflect

new events or circumstances.

DYNAMIC POLYCONJUGATES is a trademark of Arrowhead Research

Corporation.

Source: Arrowhead Research Corporation

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

Relations:
The Trout Group
Chad Rubin
646-378-2947
ir@arrowres.com
or
Media:
Russo

Partners
Matt Middleman, M.D.
212-845-4272
matt.middleman@russopartnersllc.com

Source: Arrowhead Research Corporation

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