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OvaScience and Millendo Therapeutics Announce Merger to Create Leading Rare Endocrine Disease Company

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– Transaction to Advance Millendo's Compelling Pipeline of Late-Stage
Programs for Orphan Endocrine Diseases Including Prader-Willi Syndrome –

– Companies to Host Conference Call to Discuss Transaction at 8:30
a.m. ET –

OvaScienceSM
(NASDAQ:OVAS) and privately-held Millendo
Therapeutics, Inc.
, a clinical-stage biopharmaceutical company
focused on developing novel treatments for orphan endocrine diseases,
announced today that they have entered into a definitive agreement under
which OvaScience will merge with Millendo in an all-stock transaction.
The merged company will focus on advancing Millendo's pipeline of
distinct and transformative treatments for orphan endocrine diseases.
Upon shareholder approval, the combined company is expected to operate
under the name Millendo Therapeutics and trade on the Nasdaq Capital
Market under the ticker symbol MLND.

This press release features multimedia. View the full release here:
https://www.businesswire.com/news/home/20180809005194/en/

An investor syndicate that includes New Enterprise Associates, Frazier
Healthcare Partners, Roche Venture Fund, Innobio managed by Bpifrance,
Osage University Partners, Altitude Life Science Ventures, Adams Street
Partners, and Longwood Fund has committed to invest $30 million in the
combined company. This financing will help fund the further development
of Millendo's lead assets, livoletide (AZP-531) and nevanimibe
(ATR-101), and is expected to close before or concurrently with the
completion of the merger. The total cash balance of the combined company
following the closing of the merger and the financing is expected to be
at least $70 million.

Millendo is leveraging its deep understanding of recent biological
discoveries in endocrinology to build a strong pipeline based on its
clinically-validated molecules with differentiated mechanisms.
Millendo's lead asset, livoletide, is an unacylated ghrelin analogue
being developed for the treatment of Prader-Willi syndrome, a rare
genetic disease characterized by hyperphagia, a chronic unrelenting
hunger, that leads to obesity, metabolic dysfunction, reduced quality of
life and early mortality. Livoletide demonstrated positive effects in
improving hyperphagia and food-seeking behaviors in a Phase 2 study in
Prader-Willi syndrome and is expected to advance into a pivotal Phase
2b/3 study in the first quarter of 2019. Millendo is also developing
nevanimibe, an ACAT1 inhibitor for the treatment of two orphan adrenal
diseases: classic congenital adrenal hyperplasia (CAH) and endogenous
Cushing's Syndrome. Nevanimibe demonstrated positive proof-of-concept
and a favorable safety profile in an open-label Phase 2 trial in CAH and
is expected to advance into a Phase 2b study in the third quarter of
2018.

"We are excited about the opportunities created by this merger, as it
positions us to become a leader in rare endocrine diseases with the
funding needed to pursue the potential approval and commercialization of
our first-in-class programs," said Julia Owens, Ph.D., President and
Chief Executive Officer of Millendo. "Our objective has always been to
deliver meaningful therapies to patients who do not have sufficient
treatment options, and with this merger, the compelling clinical data
for our programs, and the initiations of late-stage trials for both
livoletide and nevanimibe expected in the months ahead, we are
optimistic that we can deliver on this vision."

"Following an extensive and thorough review of strategic alternatives,
we believe that this merger with Millendo is the best path forward and
has the potential to deliver significant and immediate value to
OvaScience shareholders," said Christopher Kroeger, M.D., Chief
Executive Officer of OvaScience. "We are certain that the strength and
dedication of the Millendo leadership team provides our combined company
with the capabilities to develop new and much-needed therapies for
patients with orphan endocrine diseases."

About the Proposed Transaction
On a pro forma basis and
based upon the number of shares of OvaScience common stock to be issued
in the merger, current OvaScience shareholders will own approximately
20% of the combined company and current Millendo investors will own
approximately 80% of the combined company (before accounting for the
additional financing transaction). The actual allocation will be subject
to adjustment based on OvaScience's net cash balance at the time of
closing and the amount of any additional financing consummated by
Millendo at or before the closing of the merger. The transaction has
been approved by the board of directors of both companies. The merger is
expected to close in the fourth quarter of 2018, subject to the approval
of OvaScience shareholders at a special shareholder meeting, as well as
other customary conditions.

Ladenburg Thalmann & Co. Inc. is acting as financial advisor to
OvaScience for the transaction and Mintz, Levin, Cohn, Ferris, Glovsky
and Popeo, P.C. is serving as legal counsel to OvaScience. Cooley LLP is
serving as legal counsel to Millendo.

Management and Organization
The combined company will be led
by Julia Owens, Ph.D., Millendo Chief Executive Officer and President,
and will be headquartered in Ann Arbor, Michigan. The board of directors
is expected to be composed of seven members, including current Millendo
board members Carol Gallagher, Pharm. D., Mary Lynne Hedley, Ph.D., Jim
Hindman, Carole Nuechterlein, J.D., Julia Owens, Ph.D., and Randy
Whitcomb, M.D., and current OvaScience board member, John Howe, M.D.

Conference Call
OvaScience and Millendo will host a
conference call at 8:30 a.m. ET on August 9, 2018, to discuss the
proposed transaction. The conference call may be accessed by dialing
(877) 930-8299 for U.S. callers and (253) 336-8765 for international
callers at least five minutes prior to the start of the call and
providing the passcode 8899557. Additionally, the live, listen-only
webcast of the conference call can be accessed by visiting the investors
section of the OvaScience website at www.ovascience.com,
or the press release section of the Millendo website at www.millendo.com.
A replay of the webcast can be accessed at the same location beginning
two hours following completion of the call and will be available for 90
days.

About OvaScience, Inc.
OvaScience (NASDAQ:OVAS) is
focused on developing novel treatments for women and couples struggling
with infertility. These treatments are based on a proprietary technology
platform that leverages the breakthrough discovery of egg precursor
cells – immature egg cells found within the outer ovarian cortex. In
March 2018, the Company announced preliminary blinded data for its Phase
1 trial of OvaPrime for women with primary ovarian insufficiency and
poor ovarian response. This trial was not expected to result in strong
signals on secondary endpoints. The Company has since completed
additional preclinical studies and based on results from these studies,
has scaled back investment in its research and development efforts to
focus on evaluating strategic alternatives. For more information, please
visit www.ovascience.com.

About Millendo Therapeutics, Inc.
Millendo Therapeutics is
focused on developing novel treatments for orphan endocrine diseases.
The Company's objective is to build a leading endocrine company that
creates distinct and transformative treatments for a wide range of
diseases where there is a significant unmet medical need. The Company is
currently advancing livoletide for the treatment of Prader-Willi
syndrome and nevanimibe for the treatment of classic congenital adrenal
hyperplasia and endogenous Cushing's syndrome. For more information,
please visit www.millendo.com.

No Offer or Solicitation:
This communication shall
not constitute an offer to sell or the solicitation of an offer to sell
or the solicitation of an offer to buy any securities, nor shall there
be any sale of securities in any jurisdiction in which such offer,
solicitation or sale would be unlawful prior to registration or
qualification under the securities laws of any such jurisdiction. No
public offer of securities shall be made except by means of a prospectus
meeting the requirements of Section 10 of the Securities Act of 1933, as
amended.

Important Additional Information Will be Filed with the SEC
In
connection with the proposed transaction between OvaScience and
Millendo, OvaScience intends to file relevant materials with the SEC,
including a registration statement that will contain a proxy statement
and prospectus. OVASCIENCE URGES INVESTORS AND STOCKHOLDERS TO READ
THESE MATERIALS CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME
AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT
OVASCIENCE, THE PROPOSED TRANSACTION AND RELATED MATTERS. Investors and
shareholders will be able to obtain free copies of the proxy statement,
prospectus and other documents filed by OvaScience with the SEC (when
they become available) through the website maintained by the SEC at www.sec.gov.
In addition, investors and shareholders will be able to obtain free
copies of the proxy statement, prospectus and other documents filed by
OvaScience with the SEC by contacting Investor Relations by mail at
OvaScience, Inc., Attn: Investor Relations, 9 Fourth Avenue, Waltham,
Massachusetts 02451. Investors and stockholders are urged to read the
proxy statement, prospectus and the other relevant materials when they
become available before making any voting or investment decision with
respect to the proposed transaction.

Participants in the Solicitation
OvaScience and
Millendo, and each of their respective directors and executive officers
and certain of their other members of management and employees, may be
deemed to be participants in the solicitation of proxies in connection
with the proposed transaction. Information about OvaScience's directors
and executive officers is included in OvaScience's Annual Report on
Form 10-K for the year ended December 31, 2017, filed with the SEC on
March 15, 2018, and the proxy statement for OvaScience's 2018 annual
meeting of stockholders, filed with the SEC on April 30, 2018.
Additional information regarding these persons and their interests in
the transaction will be included in the proxy statement relating to the
transaction when it is filed with the SEC. These documents can be
obtained free of charge from the sources indicated above.

Cautionary Statement Regarding Forward-Looking Statements
Certain
statements contained in this communication regarding matters that are
not historical facts, are forward-looking statements within the meaning
of Section 21E of the Securities and Exchange Act of 1934, as amended,
and the Private Securities Litigation Reform Act of 1995, known as the
PSLRA. These include statements regarding management's intentions,
plans, beliefs, expectations or forecasts for the future, and,
therefore, you are cautioned not to place undue reliance on them. No
forward-looking statement can be guaranteed, and actual results may
differ materially from those projected. OvaScience and Millendo
undertake no obligation to publicly update any forward-looking
statement, whether as a result of new information, future events or
otherwise, except to the extent required by law. We use words such as
"anticipates," "believes," "plans," "expects," "projects," "future,"
"intends," "may," "will," "should," "could," "estimates," "predicts,"
"potential," "continue," "guidance," and similar expressions to identify
these forward-looking statements that are intended to be covered by the
safe-harbor provisions of the PSLRA. Such forward-looking statements are
based on our expectations and involve risks and uncertainties;
consequently, actual results may differ materially from those expressed
or implied in the statements due to a number of factors, including, but
not limited to, risks relating to the completion of the merger,
including the need for stockholder approval and the satisfaction of
closing conditions; the anticipated financing to be completed prior to
or concurrently with the closing of the merger; the cash balances of the
combined company following the closing of the merger and the financing;
the ability of OvaScience to remain listed on the Nasdaq Capital Market;
and expected restructuring-related cash outlays, including the timing
and amount of those outlays. Risks and uncertainties related to Millendo
that may cause actual results to differ materially from those expressed
or implied in any forward-looking statement include, but are not limited
to: Millendo's plans to develop and commercialize its product
candidates, including livoletide and nevanimibe; the timing of
initiation of Millendo's planned clinical trials; the timing of the
availability of data from Millendo's clinical trials; the timing of any
planned investigational new drug application or new drug application;
Millendo's plans to research, develop and commercialize its current and
future product candidates; Millendo's ability to successfully integrate
Alizé Pharma SAS and its personnel; Millendo's ability to successfully
collaborate with existing collaborators or enter into new
collaborations, and to fulfill its obligations under any such
collaboration agreements; the clinical utility, potential benefits and
market acceptance of Millendo's product candidates; Millendo's
commercialization, marketing and manufacturing capabilities and
strategy; Millendo's ability to identify additional products or product
candidates with significant commercial potential; developments and
projections relating to Millendo's competitors and our industry; the
impact of government laws and regulations; Millendo's ability to protect
its intellectual property position; and Millendo's estimates regarding
future revenue, expenses, capital requirements and need for additional
financing following the proposed transaction.

New factors emerge from time to time and it is not possible for us to
predict all such factors, nor can we assess the impact of each such
factor on the business or the extent to which any factor, or combination
of factors, may cause actual results to differ materially from those
contained in any forward-looking statements. These risks, as well as
other risks associated with the combination, will be more fully
discussed in the proxy statement/prospectus that will be included in the
registration statement that will be filed with the SEC in connection
with the proposed transaction. Additional risks and uncertainties are
identified and discussed in the "Risk Factors" section of OvaScience's
Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and other
documents filed from time to time with the SEC. Forward-looking
statements included in this release are based on information available
to OvaScience and Millendo as of the date of this release. Neither
OvaScience nor Millendo undertakes any obligation to update such
forward- looking statements to reflect events or circumstances after the
date of this release.

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