- Subcutaneous
formulation offers potential for increased patient convenience and acceptance -
June 14, 2018
Breda, the Netherlands/Ghent, Belgium - argenx (Euronext & Nasdaq: ARGX), a clinical-stage biotechnology
company developing a deep pipeline of differentiated antibody-based therapies for the treatment of severe autoimmune diseases and
cancer, today announced results from its Phase 1 clinical trial evaluating a subcutaneous (SC) formulation of efgartigimod
(ARGX-113) in healthy volunteers. The data show that at the same dose level the SC formulation was comparable across key measures,
including half-life, pharmacodynamics and tolerability, to the intravenous (IV) formulation used in clinical studies to date.
argenx intends to use the data from the Phase 1 study to further explore SC dosing schedules of efgartigimod as
a more convenient administration option for patients, including the potential of a loading dose of IV efgartigimod followed by SC
maintenance.
"We believe the development of a SC formulation could offer a more tailored therapy by providing flexible dosing
options and greater convenience for patients. With a SC formulation, we also plan to explore the potential for an off-the-shelf
delivery system using a fine bore needle size to allow patients additional optionality around administration," said Keith Woods,
Chief Operating Officer at argenx. "Based on the data presented today showing that SC dosing can maintain IgG suppression, we
intend to further develop this product candidate within our efgartigimod portfolio."
The open-label, Phase 1 study enrolled 32 healthy volunteers and included three treatment arms: one each of
single dose SC and IV efgartigimod, and one evaluating an IV induction followed by a SC maintenance dose. In the single dose
treatment arms, the data showed the SC formulation to have comparable half-life, pharmacodynamics and tolerability to the IV
formulation, and a bioavailability of approximately 50%. In addition, initial IV dosing followed by weekly 300 mg (2 ml) SC
administration of efgartigimod provided sufficient exposure to maintain IgG suppression at a steady state IgG reduction of
approximately 50%. The data also suggest a favorable tolerability profile and no meaningful anti-drug antibody signals were
reported. The SC formulation supports key manufacturing improvements, including a high product concentration (150mg/ml), low
viscosity and optimal stability.
About efgartigimod Phase 2 Trials
Efgartigimod is currently being tested in two Phase 2 clinical trials for immune thrombocytopenia (ITP) and pemphigus vulgaris
(PV). argenx is also preparing for a potential Phase 3 clinical trial in myasthenia gravis (MG) using the IV formulation of
efgartigimod. In a Phase 2 clinical trial with MG patients, the IV formulation was well-tolerated and showed promising
pharmacodynamic effects relating to speed, depth and duration of total IgG and pathogenic IgG reduction.
About efgartigimod
Efgartigimod (ARGX-113) is an investigational therapy for IgG-mediated autoimmune diseases and was designed to exploit the natural
interaction between IgG antibodies and the recycling receptor FcRn. Efgartigimod is the Fc-portion of an antibody that has been
modified by the argenx proprietary ABDEG(TM) technology to increase its affinity for FcRn beyond that of normal IgG antibodies. As
a result, efgartigimod blocks antibody recycling through FcRn binding and leads to fast depletion of the autoimmune disease-causing
IgG autoantibodies. The development work on efgartigimod is conducted in close collaboration with Prof. E. Sally Ward (University
of Texas Southwestern Medical and Texas A&M University Health Science Center, a part of Texas A&M University (TAMHSC)).
About argenx
argenx is a clinical-stage biotechnology company developing a deep pipeline of differentiated antibody-based therapies for the
treatment of severe auto-immune diseases and cancer. The company is focused on developing product candidates with the potential to
be either first-in-class against novel targets or best-in-class against known, but complex, targets in order to treat diseases with
a significant unmet medical need. argenx' ability to execute on this focus is enabled by its suite of differentiated technologies.
The SIMPLE AntibodyTM Platform, based on the powerful llama immune system, allows argenx to exploit novel and complex
targets, and the three antibody engineering technologies are designed to enable the expansion of the therapeutic index of the
company's product candidates.
www.argenx.com
For further information, please contact:
Joke Comijn, Director Corporate Communications & Investor Relations (EU)
+32 (0)477 77 29 44
+32 (0)9 310 34 19
info@argenx.com
Beth DelGiacco, VP Investor Relations (US)
+1 518 424 4980
bdelgiacco@argenx.com
Forward-looking Statements
The contents of this announcement include statements that are, or may be deemed to be, "forward-looking
statements." These forward-looking statements can be identified by the use of forward-looking terminology, including the terms
"believes," "estimates," "anticipates," "expects," "intends," "may," "will," or "should," and include statements argenx makes
concerning the intended results of its strategy and argenx's advancement of, and anticipated clinical development and regulatory
milestones and plans, including the Phase 1 program to evaluate a subcutaneous formulation of efgartigimod (including additional
dosing schedules), including its potential manufacturing characteristics and convenience of administration; the progress of its
Phase 2 clinical trials of efgartigimod in ITP and PV; the potential of a Phase 3 clinical trial of efgartigimod in MG; the timing
of expected data readouts related to efgartigimod; and the commercial potential of efgartigimod. By their nature, forward-looking
statements involve risks and uncertainties and readers are cautioned that any such forward-looking statements are not guarantees of
future performance. argenx's actual results may differ materially from those predicted by the forward-looking statements as a
result of various important factors, including argenx's expectations regarding its the inherent uncertainties associated with
competitive developments, preclinical and clinical trial and product development activities and regulatory approval requirements;
argenx's reliance on collaborations with third parties; estimating the commercial potential of argenx's product candidates;
argenx's ability to obtain and maintain protection of intellectual property for its technologies and drugs; argenx's limited
operating history; and argenx's ability to obtain additional funding for operations and to complete the development and
commercialization of its product candidates. A further list and description of these risks, uncertainties and other risks can be
found in argenx's U.S. Securities and Exchange Commission (SEC) filings and reports, including in argenx's most recent annual
report on Form 20-F filed with the SEC as well as subsequent filings and reports filed by argenx with the SEC. Given these
uncertainties, the reader is advised not to place any undue reliance on such forward-looking statements. These forward-looking
statements speak only as of the date of publication of this document. argenx undertakes no obligation to publicly update or revise
the information in this press release, including any forward-looking statements, except as may be required by
law.