- PRIMROSE 1 and PRIMROSE 2, pivotal Phase 3 clinical trials to assess efficacy and safety of novel oral GnRH
receptor antagonist OBE2109 in patients with heavy menstrual bleeding associated with uterine fibroids -
Geneva, Switzerland - 25 April 2017 - ObsEva SA (Nasdaq: OBSV), a Swiss biopharmaceutical company focused
on the development and commercialization of novel therapeutics for serious conditions that compromise a woman's reproductive health
and pregnancy, today announced commencement of its Phase 3 clinical program evaluating gonadotropin-releasing hormone (GnRH)
receptor antagonist OBE2109 for the treatment of uterine fibroids (UF). The first clinical centers are opened and started the
recruitment of patients. The program is comprised of PRIMROSE 1 and PRIMROSE 2, two double-blind, placebo-controlled, Phase 3
international clinical trials in women with heavy menstrual bleeding (HMB) associated with UF.
OBE2109 is a novel, oral GnRH receptor antagonist that potentially provides effective management of
UF-associated HMB by reducing estrogen production by the ovaries in pre-menopausal women.
The PRIMROSE Phase 3 clinical trials will be conducted at up to 200 sites in the United States and Europe,
enrolling, in total, approximately 1,000 women with a diagnosis of HMB associated with UF. Eligible women will be randomized to
receive either 100 mg or 200 mg of OBE2109 or placebo. Active treatment arms will be tested with and without low doses of hormonal
add-back therapy. Patients will be treated for up to 52 weeks to evaluate the safety of long-term treatment. The primary outcome of
the PRIMROSE clinical trials is a clinically meaningful and statistically significant reduction in menstrual bleeding as assessed
by the alkaline hematin method, a reliable quantitative measurement of menstrual blood loss. Safety assessments will include a
centralized assessment of bone mineral density changes measured by dual-energy x-ray absorptiometry (DXA).
"We are evaluating long term administration of OBE2109 in two dosing regimens - as a stand-alone therapy or
in association with add-back therapy - designed to offer the broad patient population the personalized options needed for symptom
relief with fewer side effects and complications" said Ernest Loumaye, MD, PhD, OB&GYN, CEO and Co-Founder of ObsEva.
"Owing to its consistent PK/PD profile, the lower dose of OBE2109 is designed to allow for the maintenance of estradiol levels
within an acceptable range that reduces HMB while mitigating bone mineral density loss and other adverse effects, eliminating the
need for systematic add-back therapy."
About Uterine Fibroids
Uterine fibroids are common non-cancerous tumors that grow within the muscular wall of the uterus. They can vary
in size and number and when symptomatic, are most often accompanied by heavy menstrual bleeding (HMB), anemia, abdominal pressure
and pain, bloating, increased urinary frequency and reproductive dysfunction. Uterine fibroids are associated with an increased
risk of pregnancy complications such as infertility, miscarriage, placental abruption and early onset of labor. According to a
study published in the American Journal of Obstetrics & Gynecology in 2003, uterine fibroids affect an estimated 20 to 40 percent
of women over the age of 30 in the United States based on clinical cases and women who undergo treatment.
For the millions of women with symptomatic uterine fibroids seeking treatment options, selection is driven by
symptom severity, the woman's age, and her desire to have children now or in the future. While medical, surgical and minimally
invasive treatments are available, the standard of care for symptomatic uterine fibroids is a hysterectomy or, in women who wish to
preserve their fertility, surgical removal of the fibroid(s).
About OBE2109 and GnRH
OBE2109 is a novel, orally administered GnRH receptor antagonist with a potentially best-in-class profile in
late-stage clinical development for the treatment of pain associated with endometriosis and heavy menstrual bleeding associated
with uterine fibroids. OBE2109 acts by binding to and blocking the GnRH receptor in the pituitary gland, ultimately reducing
estrogen production by the ovaries. Through previously reported results from this class of drugs and sophisticated pharmacological
modelling, it has been established that maintaining estradiol within a specific target range provides the optimal balance between
reducing symptoms while mitigating bone density loss associated with excessive estradiol suppression. ObsEva licensed OBE2109 from
Kissei in late 2015 and retains worldwide commercial rights, excluding Asia, for OBE2109.
About Kissei
Kissei is a Japanese pharmaceutical company with approximately 70 years of history, specialized in the field of
obstetrics/gynecology, renal dialysis, urology, metabolism and ophthalmology. Silodosin is a Kissei product for the treatment of
the signs and symptoms of benign prostatic hyperplasia which is sold worldwide through its licensees. KLH-2109/OBE2109 is a new
chemical entity discovered by Kissei R&D which contributes to Kissei's obstetrics/gynecology franchise.
About ObsEva
ObsEva is a clinical-stage biopharmaceutical company focused on the clinical development and commercialization
of novel therapeutics for serious conditions that compromise a woman's reproductive health and pregnancy. Through strategic
in-licensing and disciplined drug development, ObsEva has established a late-stage clinical pipeline with development programs
focused on treating endometriosis, uterine fibroids, preterm labor and improving ART outcomes. ObsEva is listed on The NASDAQ
Global Select Market and is trading under the ticker symbol "OBSV". For more information, please visit www.ObsEva.com.
Cautionary Note Regarding Forward-Looking Statements
Any statements contained in this press release that do not describe historical facts may constitute
forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. These statements may be
identified by words such as "believe", "expect", "may", "plan," "potential," "will," and similar expressions, and are based on
ObsEva's current beliefs and expectations. These forward-looking statements include expectations regarding the clinical development
of OBE2109. These statements involve risks and uncertainties that could cause actual results to differ materially from those
reflected in such statements. Risks and uncertainties that may cause actual results to differ materially include uncertainties
inherent in the conduct of clinical trials, ObsEva's reliance on third parties over which it may not always have full control, and
other risks and uncertainties that are described in the Risk Factors section of ObsEva's Annual Report on Form 20-F for the year
ended December 31, 2016, and other filings ObsEva makes with the SEC from time to time. These documents are available on the
Investors page of ObsEva's website at http://www.obseva.com. Any forward-looking statements speak only as of the date of this press
release and are based on information available to ObsEva as of the date of this release, and ObsEva assumes no obligation to, and
does not intend to, update any forward-looking statements, whether as a result of new information, future events or otherwise.
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Media Contact:
Liz Bryan
Spectrum Science
lbryan@spectrumscience.com
202-955-6222 x2526
Company Contact:
Delphine Renaud
ObsEva, CEO Office
delphine.renaud@obseva.ch
+41 22 552 1550
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