Merck Researchers Present BMD Data from a Phase II Study of Odanacatib, Merck’s Investigational Cat-K Inhibitor for Post

  Merck Researchers Present BMD Data from a Phase II Study of Odanacatib,
  Merck’s Investigational Cat-K Inhibitor for Post-Menopausal Osteoporosis

 Odanacatib Significantly Increased BMD Following Prior Alendronate Treatment

Business Wire

MINNEAPOLIS -- October 13, 2012

Merck (NYSE: MRK), known as MSD outside the United States and Canada, today
announced results from a Phase II trial for odanacatib, an investigational
cathepsin K (cat-K) inhibitor in development for the treatment of osteoporosis
in post-menopausal women. The results were presented today at the 34^th Annual
Meeting of the American Society for Bone and Mineral Research.

In the study, treatment with odanacatib (compared to placebo) significantly
increased Bone Mineral Density (BMD) over a two-year period in post-menopausal
osteoporotic women who previously had three or more years of treatment with
alendronate. Patients were allowed to have been off alendronate therapy for up
to three months immediately prior to enrollment in the study.

“Odanacatib works differently than other treatments for osteoporosis by
targeting cat-K, a specific enzyme within bone cells,” said Albert Leung,
M.D., Ph.D., executive director, clinical research, Merck Research
Laboratories. “We’re excited about these results because understanding the
effects of odanacatib in a population of post-menopausal women previously
treated for osteoporosis is important to clinicians.”

Study evaluated efficacy and safety of odanacatib following treatment with
alendronate

This study was a randomized, double-blind, placebo-controlled, multi-center,
24-month trial of odanacatib in 243 women with post-menopausal osteoporosis
who had been previously treated with alendronate (dosed daily or weekly) for
≥3 years. Participants were at least 60 years of age with low BMD T-scores
(≤–2.5 and >-3.5) at any hip site (femoral neck, trochanter, or total hip)
without a history of fragility fracture, or had BMD T-scores ≤-1.5 and > -3.5
at any hip site, with a history of fragility fracture (except hip fracture).
The patients were randomized in a 1:1 ratio to receive odanacatib 50 mg once
weekly or placebo for 24 months. All patients received vitamin D3 (5600
IU/week) and also calcium supplementation, if needed.

The study evaluated the effects of odanacatib 50 mg once weekly on the
following:

  *Femoral neck BMD change from baseline compared to placebo over 24 months
    (primary endpoint)
  *Femoral neck BMD compared to baseline over 24 months (key secondary
    endpoint)
  *BMD at hip trochanter, total hip, lumbar spine and distal forearm
  *Biochemical markers of bone resorption and formation at months 12 and 24
  *Clinical and laboratory assessment of safety and tolerability

BMD was assessed by DXA at baseline, 6, 12 and 24 months. This study was not
designed to evaluate the effect of odanacatib on fractures.

Results showed odanacatib significantly increased BMD compared to placebo

In the odanacatib group, BMD changes from baseline at 24 months were
significantly different versus placebo at all three hip sites (+1.73%, +1.83%,
+0.83% for the femoral neck, hip trochanter, and total hip, respectively, vs.
-0.94%, -1.35%, -1.87% with placebo), and the lumbar spine (+2.28% vs. -0.30%
change with placebo). At the distal forearm, BMD changes from baseline at 24
months were -0.92% and -1.14%. The difference versus placebo at the distal
forearm (+0.22%) was not statistically significant.

The overall incidence of adverse events, including those that were considered
drug-related or serious, were similar between treatment groups. Treatment
discontinuations due to adverse events were 9.0 percent for patients receiving
odanacatib and 3.3 percent for patients receiving placebo. The most common
clinical adverse events in patients receiving odanacatib and placebo,
respectively, were urinary tract infection (11.5%, 16.5%), back pain (11.5%,
9.9%), arthralgia (9.0%, 9.9%), fractures (4.9%, 13.2%), bronchitis (5.7%,
4.1%), nasal pharyngitis (3.3%, 5.8%), and upper respiratory infection (4.1%,
0.8%).

About Odanacatib

In osteoporosis, bone loss occurs because of an imbalance in bone remodeling
(the rate of bone resorption exceeds that of bone formation). Osteoclasts,
cells that resorb bone, secrete signaling factors to stimulate osteoblasts,
cells that form bone. Odanacatib selectively inhibits cat-K, the primary
enzyme in the osteoclasts that digests proteins during bone resorption.
Progressive increases in bone mineral density have been demonstrated with
odanacatib.

In July 2012, Merck announced it planned to begin closing the Phase III trial
assessing fracture risk reduction with odanacatib, at the recommendation of
the study’s Data Monitoring Committee (DMC), after its first planned interim
analysis showed robust efficacy and a favorable benefit-risk profile. The DMC
noted that safety issues remain in certain selected areas and made a
recommendation with respect to following up on them. Merck's previously
announced plan to conduct a blinded extension trial will allow further
monitoring of the issues. The extension trial will also continue to measure
efficacy.

Final results of the study will be submitted for presentation and publication
in 2013 once the data analysis is complete. Merck anticipates submitting
regulatory applications for odanacatib in the United States and European Union
(EU) in the first half of 2013, and in Japan in the second half of 2013.

About Merck

Today's Merck is a global healthcare leader working to help the world be well.
Merck is known as MSD outside the United States and Canada. Through our
prescription medicines, vaccines, biologic therapies, and consumer care and
animal health products, we work with customers and operate in more than 140
countries to deliver innovative health solutions. We also demonstrate our
commitment to increasing access to healthcare through far-reaching policies,
programs and partnerships. For more information, visit www.merck.com and
connect with us on Twitter, Facebook and YouTube.

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Contact:

Merck
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Kelley Dougherty, 908-423-4291
or
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or
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