Arrowhead Pharmaceuticals Receives FDA Clearance to Begin Phase 2/3 Study of ARO-AAT for Treatment of Alpha-1 Liver Disease

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Arrowhead Pharmaceuticals Receives...

PASADENA, Calif.–(BUSINESS WIRE)–Apr. 15, 2019–
Arrowhead Pharmaceuticals Inc. (NASDAQ: ARWR) today announced that it
has received clearance from the U.S. Food and Drug Administration to
proceed with an adaptive Phase 2/3 trial with the potential to serve as
a pivotal registrational study of ARO-AAT, the company’s second
generation subcutaneously administered RNA interference (RNAi)
therapeutic being developed as a treatment for a rare genetic liver
disease associated with alpha-1 antitrypsin deficiency (AATD).

Arrowhead intends to initiate the adaptive design, Phase 2/3 study of
ARO-AAT in patients with AATD associated liver disease at various sites
in the U.S. in the second quarter of 2019, followed by various
international sites in Europe, pending regulatory submission and review.
The proposed primary objectives are to evaluate safety and
pharmacodynamic dose response, and to evaluate efficacy, defined as an
improvement in a histologic grading scale of AATD associated liver
disease, and no worsening of liver fibrosis based on Ishak score on end
of study biopsy. The company plans to provide additional study details
following its initiation.

About Arrowhead Pharmaceuticals

Arrowhead Pharmaceuticals develops medicines that treat intractable
diseases by silencing the genes that cause them. Using a broad portfolio
of RNA chemistries and efficient modes of delivery, Arrowhead therapies
trigger the RNA interference mechanism to induce rapid, deep, and
durable knockdown of target genes. RNA interference, or RNAi, is a
mechanism present in living cells that inhibits the expression of a
specific gene, thereby affecting the production of a specific protein.
Arrowhead’s RNAi-based therapeutics leverage this natural pathway of
gene silencing.

For more information, please visit www.arrowheadpharma.com,
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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 the safety and efficacy of our product
candidates, the duration and impact of regulatory delays in our clinical
programs, our ability to finance our operations, the likelihood and
timing of the receipt of future milestone and licensing fees, the future
success of our scientific studies, our ability to successfully develop
and commercialize drug candidates, the timing for starting and
completing clinical trials, rapid technological change in our markets,
and the enforcement of our intellectual property rights. Our 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.

Source: Arrowhead Pharmaceuticals, Inc.

Source: Arrowhead Pharmaceuticals Inc.

Contacts:
Arrowhead Pharmaceuticals, Inc.
Vince
Anzalone, CFA
626-304-3400
ir@arrowheadpharma.com

Investors and Media:
LifeSci Advisors, LLC
Brian Ritchie
212-915-2578
britchie@lifesciadvisors.com
www.lifesciadvisors.com