Merck KGaA: Oral Investigational Treatment Cladribine Tablets for Multiple Sclerosis Significantly Reduced Relapse Rate in Phase III Pivotal Trial

• Two-year primary efficacy endpoint of CLARITY trial met: 58% relative
reduction in annualized relapse rate in the low total dose treatment group
and 55% in the high total dose treatment group

• Submission for registration of cladribine tablets planned for mid-2009

• Cladribine tablets are the first oral investigational multiple sclerosis
treatment to complete a two-year pivotal study

Darmstadt, Germany, January 23, 2009 – Merck KGaA and its Merck Serono division
announced today that the CLARITY1 Phase III pivotal trial of its proprietary oral
formulation of cladribine (cladribine tablets) met the two-year primary endpoint of
clinical relapse rate reduction in patients with relapsing-remitting multiple sclerosis
(MS).

The two cladribine tablet treatment groups of the study, assessing different dose
regimens, demonstrated a statistically significant reduction in the annualized rate of
relapses compared to placebo. Patients from the lower total dose group experienced a
58% relative reduction in annualized relapse rates with respect to placebo (0.14 versus
0.33 for the placebo group; p<0.001). Patients from the higher total dose group
experienced a 55% relative reduction in annualized relapse rates with respect to
placebo (0.15 versus 0.33; p<0.001).

Overall, the frequencies of adverse events were low in the cladribine tablet treatment
groups and were comparable to that observed in the placebo group. Lymphopenia, an expected event based on the presumed mechanism of action of cladribine, occurred
more frequently in the cladribine tablet treatment groups. With the exception of
lymphopenia, the most frequently reported adverse events in the three study groups
were headaches and nasopharyngitis.

“We believe the CLARITY data mark an important milestone in the assessment of
investigational oral treatments for multiple sclerosis and that cladribine tablets have the potential to make a real difference in the lives of patients,” said Elmar Schnee, Executive Board Member with responsibility for the Pharmaceuticals business sector.

“Based on the successful completion of the CLARITY study, we plan to submit cladribine tablets for registration to the EMEA and to the FDA for mid-2009."

Secondary endpoints of the CLARITY study were also met, including reduction of lesion activity as measured by magnetic resonance imaging (MRI), proportion of subjects relapse-free and disability progression. Full study results will be submitted for
presentation at an upcoming scientific meeting.

The CLARITY study was a two-year (96 weeks), randomized, double-blind, placebo controlled, international trial. It enrolled 1,326 patients with relapsing-remitting MS
according to the revised McDonald criteria2. Study participants were randomized to one
of three different treatment groups consisting of two different dose regimens of
cladribine tablets or matching placebo tablets (1:1:1 ratio). Cladribine tablets were
given in two or four treatment courses in the first year, with each course consisting of once daily administration for four to five consecutive days, which means study patients took cladribine tablets for only 8 to 20 days during the year. In the second year, two treatment courses were administered to all patient groups. The primary endpoint of the CLARITY study was the qualifying relapse rate at 96 weeks. Secondary endpoints included MRI endpoints3, proportion of subjects relapse-free and disability progression at 96 weeks. Out of the 1,326 randomized patients, 90% of patients treated with cladribine tablets completed the study (92% in the lower total dose group and 89% in the higher total dose group) compared to 87% in the placebo group.

1 CLARITY: CLAdRIbine Tablets Treating MS OrallY

2 The McDonald criteria are diagnostic criteria for MS. In April 2001 an international panel in association with the National Multiple Sclerosis Society (NMSS) of America recommended revised diagnostic criteria for MS. They make use of advances in MRI imaging techniques and are intended to replace the Poser criteria. The new criteria facilitate the diagnosis of MS in patients who present with signs and symptoms
suggestive of the disease. The McDonald criteria for the diagnosis of multiple sclerosis were revised in 2005 to simplify and speed diagnosis, while maintaining adequate sensitivity and specificity.

3 The exact correlation between MRI findings and the current or future clinical status of patients, including disability progression, is unknown.

About cladribine tablets

Merck Serono’s proprietary oral formulation of cladribine (cladribine tablets) is currently being evaluated in Phase III as a treatment for patients with relapsing forms of multiple sclerosis (MS). Cladribine is a small molecule that may interfere with the behavior and the proliferation of certain white blood cells, particularly
lymphocytes, which are thought to be involved in the pathological process of MS.
The clinical development program for cladribine tablets includes:

- The CLARITY (CLAdRIbine Tablets Treating MS OrallY) extension study: a two-year placebo-controlled extension of the CLARITY study, designed to provide data on the long-term safety and efficacy of extended administration of cladribine tablets for up to four years

- The ORACLE MS (ORAl CLadribine in Early MS) study: a two-year Phase III placebo-controlled trial designed to evaluate the efficacy and safety of cladribine tablets as a monotherapy in patients at risk of developing MS (patients who have experienced a first clinical event suggestive of MS). This trial was announced in September 2008.

- The ONWARD (Oral Cladribine Added ON To Rebif New Formulation in Patients With Active Relapsing Disease) study: a Phase II placebo-controlled trial designed primarily to evaluate the safety and tolerability of adding cladribine tablets treatment to patients with relapsing forms of MS, who have experienced breakthrough disease while on established interferon-beta therapy. This trial was announced in January 2007.

Cladribine tablets have been granted a fast track designation by the US Food and Drug Administration based on the need for an oral therapy in a subset of patients with relapsing forms of multiple sclerosis.

About Merck Serono and multiple sclerosis

Merck Serono is a leader in multiple sclerosis (MS) with Rebif® (interferon beta-1a), a disease-modifying drug used to treat relapsing forms of MS, which is registered in more than 80 countries worldwide. Full prescribing information for this product can be obtained by contacting the Company or visiting its website.

Additional therapeutic options are currently under development at Merck Serono, including cladribine tablets, currently in Phase III and potentially the first oral therapy for MS, as well as several products in early stage development. Merck Serono also is taking a leading role in developing an understanding of the role of genetics in MS.

About multiple sclerosis

Multiple sclerosis (MS) is a chronic, inflammatory condition of the nervous system and is the most common, non-traumatic, disabling neurological disease in young adults. The World Health Organization estimates that up to 2.5 million people suffer from MS worldwide. While symptoms can vary, the most common symptoms of MS include blurred vision, numbness or tingling in the limbs and problems with strength and coordination. The relapsing forms of MS are the most common.


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Merck is a global pharmaceutical and chemical company with total revenues of € 7.1 billion in 2007, a history that began in 1668, and a future shaped by 32,458 employees in 59 countries. Its success is characterized by innovations from entrepreneurial employees. Merck's operating activities come under the umbrella of Merck KGaA, in which the Merck family holds an approximately 70% interest and free shareholders own the remaining approximately 30%. In 1917 the U.S. subsidiary Merck & Co. was expropriated and has been an independent company ever since.

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Improving Therapeutic Options for Multiple Sclerosis

Improving Therapeutic Options for Multiple Sclerosis: An Interview With Edward Fox, MD, PhD

Elizabeth Samander, PhD

Medscape Neurology & Neurosurgery. 2008; ©2008 Medscape
Posted 10/16/2008

Editor's Note

New data from key trials in multiple sclerosis (MS) regarding novel therapeutic approaches were presented at the World Congress on Treatment and Research in Multiple Sclerosis held from September 17-20, 2008, in Montreal, Canada. Medscape Scientific Director Elizabeth Samander, PhD, interviewed Edward Fox, MD, PhD, about the results of these trials and what implications these results may have on clinical practice and the future management of patients with MS.

Medscape: Dr. Fox, in your opinion, what were the most compelling research findings presented at the World Congress on Treatment and Research in Multiple Sclerosis (WCTRIMS) meeting this year?

Dr. Fox: The overall message from the meeting this year was that a number of medications are currently being investigated that hold great promise for the treatment of multiple sclerosis (MS). Research was presented from numerous trials involving novel therapies, including monoclonal antibody and oral products. There was a substantial amount of evidence presented on both of those categories, including further data from completed phase 2 trials and descriptions of ongoing phase 3 trials. The number of medications that we have under current investigation is really quite large, so it is difficult to see the timeline for these medicines actually being brought to market. We had hoped that these studies would fully enroll quickly, so that we would have finalized data coming within the next few years. However, it is likely that there will be some delays because of the large number of competing trials with slower-than-expected enrollment.

Monoclonal antibody agents discussed at the meeting included alemtuzumab, rituximab, and daclizumab.[1-6] Those antibodies have certainly been well-tested in phase 2 trials, and plans are ongoing for phase 3 trials in relapsing-remitting MS. There was also a phase 3 trial regarding rituximab[1,5,7] for the treatment of primary progressive MS. The primary endpoint of time to confirmed disease progression did not show a statistically significant difference between rituximab and placebo. However, subcohort analysis suggested a benefit for those patients with active magnetic resonance imaging (MRI) at entry into the study. I think that the overall feeling about B-cell depletion in the treatment of MS is very positive. We are looking forward to other studies, including ones on ocrelizumab,[8] another monoclonal antibody, which can selectively deplete B cells and thereby reduce MS disease activity.

The data presented on the alemtuzumab trial was further information from the phase 2 trial, which showed a highly significant decrease in the number of relapses seen in patients on alemtuzumab compared with patients receiving interferon beta-1a subcutaneously 3 times weekly.[4] The data presented were on a 3 year follow-up trial designed to evaluate the percentage of patients who were clinically disease-free. These were patients who did not have relapses and did not have a progression of disability during the course of the trial. The superiority of alemtuzumab compared with beta-interferon was sustained throughout the 3 years on study. Within the third year it was found that 71% of the patients who were on alemtuzumab were clinically disease-free compared with 38% of those who were receiving interferon beta-1a. These findings have led to the development of 2 phase 3 trials currently enrolling patients.

Medscape: What other novel therapeutic approaches are undergoing clinical trials?

Dr. Fox: The oral medications discussed at this meeting included cladribine,[9-11] fingolimod,[12-14] BG-00012,[15,16] teriflunomide,[1,13,17] and laquinimod.[18] All of these oral agents, as well as several others, are showing promise for the treatment of MS. It may be that any or all of these products will have success in the treatment of MS, but at this time we're still in the discovery phase for the safety as well as for the efficacy of these medications.

The phase 2 trials that have been performed have primarily been based on looking for a reduction in new MRI activity in patients with multiple sclerosis. They all have shown various degrees of benefit in reducing gadolinium-enhancing lesions on MRIs during the course of the phase 2 trials. However, these trials were rather short and generally were not powered to show significant clinical outcomes. An exception was the phase 2 trial on fingolimod, which did show a substantial reduction in relapse rate as well.

The phase 3 trials are going to be looking not only at reduction in MRI activity, but will also be looking at the important clinical measures that will be required for these medications to be licensed. Those include a reduction in relapse rate and prevention of sustained accumulation of disability compared with placebo. These clinical outcome measures may or may not be found despite the MRI evidence that has been seen in the past, because there has been a disconnect between MRI activity and clinical activity seen in several previous agents tested for MS.

Medscape: There is evidence that disease-modifying treatments, although partially effective, are associated with injection-related side effects and suboptimal patient adherence. These findings may suggest that novel therapeutic strategies, including oral therapies, monoclonal antibodies, symptomatic treatments, and combination regimens, are warranted. What is the role of these novel agents in the therapeutic armamentarium with respect to first-line use, add-on treatment for failed first-line therapy, or as an effective induction agent?

Dr. Fox: Certainly our hope is that there's going to be an increased number of agents available for the treatment of MS, but it's going to be necessary to determine at what stage of disease we would use these medications.[19] The strategy of phase 3 trials is typically in first-line treatment of relapsing-remitting MS, in a placebo-controlled trial evaluating medication over a period of 2 years. This certainly gives us an idea as to what its overall effectiveness can be, and the newer treatments will be evaluated for the ability to reduce relapses and accumulation of disability. Phase 3 trials will also have to show an acceptable safety profile and risk management plan. The first-line agents that we currently have on the market, glatiramer acetate and the beta interferons, will likely continue to have a role in first-line therapy when we look at long-term efficacy and safety measures of the newer medicines. It will likely take a number of years to determine the true safety of the monoclonal and oral agents, and their overall use as first-line therapies will depend on these data.

The concern that we have about using any of the new agents as an add-on treatment for failed first-line therapy is again, a safety issue. If it's being used in a combination with other immunomodulatory or immunosuppressive therapy, we cannot currently define the safety of such an approach. This has been a major concern lately with the findings of opportunistic infections such as progressive multifocal leukoencephalopathy in patients who are immunosuppressed. Switching from ineffective first-line therapy to a new therapy is going to be the most likely use in clinical practice soon after these agents reach the market.

Using any of these agents as an effective induction agent is going to require more data from trials where this has been specifically tried. Older medications such as mitoxantrone have been tested as induction therapies with some very favorable results, but the novel agents that are being investigated right now have not been similarly tested.[20-24] Therefore, I believe that the novel agents are likely to be used as first-line or second-line agents rather than initially as induction agents.

Medscape: What is the evidence for agents optimized for neuroprotection and neurorepair?

Dr. Fox: Ideally, any medication that we use as a preventive medicine for MS would have neuroprotective and neurorepair abilities. Research has shown a frequent association of better clinical outcomes if there's prevention of atrophy. The concept of neuroprotection is that we are preventing axonal loss and neuronal loss during the early stages of MS prior to the onset of disability. All of the trials that are looking at atrophy measures are addressing this issue to some degree, but we would like to have advanced imaging metrics to look more directly at the preservation of axonal and neuronal function.

The World Congress and Treatment for Research of Multiple Sclerosis Meeting had a substantial amount of data that were presented regarding these advanced imaging metrics, including magnetic resonance spectroscopy (MRS) and magnetization transfer imaging (MTR). Measurement of neuronal loss by optical coherence tomography (OCT) is also a very promising method of evaluating the degree of atrophy seen in MS.[25] It is likely that the novel therapies currently being investigated will also be tested in a similar manner. It is reassuring to know that we are seeing some positive data on neuroprotection. Improving repair mechanisms may require a new type of medication that would stimulate the production of new myelin growth rather than working as an immunosuppressant medication.

Medscape: What are the limitations and benefits of these novel therapeutic agents, with respect to safety and efficacy, compared with long-approved therapies such as interferon beta and glatiramer acetate?

Dr. Fox: The-first line therapies that we are currently using for the treatment of MS have been on the market for a number of years. The users of these medicines have a certain comfort level with these medications now and the understanding that the long-term data have indicated a relatively good safety profile.

Immunomodulating therapies do not appear to cause the degree of risk that the immunosuppressant therapies may cause. We understand the risk-benefit ratios of the medicines that have been on the market for a number of years, but the novel therapies that are currently under investigation will undoubtedly have a higher degree of uncertainty as to their safety for many years to come. It is quite possible that the novel therapies are going to have immunosuppressant activity that could lead to increased risk for opportunistic infections, limiting their use as first-line therapies.

The efficacy measures, on the other hand, may show direct or indirect evidence of superiority to the first-line therapies. If indeed the therapeutic abilities of these novel therapies are great enough, then we may accept a higher risk potential with these medications and use them as first-line therapy. However, I don't think that the true measure of a medication's safety will be known at the time it enters the market.

Medscape: Does the increase of potential therapeutic agents complicate how to choose first-line therapy?

Dr. Fox: I think with the advent of more choices, we're going to have a greater divide among practicing neurologists as to how they approach the disease. Right now there's fairly good uniformity among neurologists in terms of how to treat early MS. There are differences in opinion about the optimal medication strategies for people with aggressive or chronic disease. But early active disease is currently treated by a limited number of agents that have relatively similar outcome measures in terms of their ability to control the disease. If we have new medicines available to us over the next several years that have a much different risk-benefit ratio with greater promise of disease control but increased risk, I feel that there's likely to be a group of neurologists who will use these medications first line. But there will be a number of other neurologists who are much more conservative in their acceptance of the new medications and will limit the new medicines only to those patients who have failed existing therapies.

Medscape: The fields of genetics and proteomics are beginning to play a large part in the discovery of novel therapeutic targets. How do these newly identified targets impact the development of individualized therapeutic strategies?

Dr. Fox: As we understand the pathology of MS better, we may find that certain medications are tailored for some patients more than others. For example, the biomarkers that may eventually be used for MS would determine whether we would want to use therapies that were depleters of B cells, T cells, monocytes, or a wide-spectrum immunosuppressant.[26,27] Critical to this line of thinking is the understanding of the mechanism of action of our current medications, which remains somewhat murky to this day, because MS is a highly variable and unpredictable disease with different pathologies among different patients. If we understood the pharmacogenomics of MS better, we might be able to tailor appropriate therapies much more accurately.

Medscape: What are some of the outstanding challenges in the treatment of MS that need to be addressed in the future?

Dr. Fox: Balancing the risks and benefits of medications in the treatment of MS has become increasingly important in the last few years. The major challenge in understanding the nature of this disease is elucidating the prognostic factors for an individual patient, so that we may prevent the development of permanent disability that at this point cannot be alleviated. If we can determine which patients have early, aggressive MS before the development of axonal loss and atrophy, we stand a much greater chance of being able to appropriately determine who might require stronger immunosuppressant. Our challenge going forward is to address both the inflammatory and the degenerative nature of MS with medications that effectively control the disease. Data presented at the World Congress on Treatment and Research in Multiple Sclerosis suggests we are now closer to that goal.

Medscape: Thank you Dr. Fox for sharing this information and your insights with us today.

This activity is supported by an independent educational grant from Teva.
References

1. Linker RA, Kieseier BC, Gold R. Identification and development of new therapeutics for multiple sclerosis. Trends Pharmacol Sci. 2008 Sep 17. [Epub ahead of print].
2. Gasperini C, Cefaro LA, Borriello G, et al. Emerging oral drugs for multiple sclerosis. Expert Opin Emerg Drugs. 2008;13:465-477. Abstract
3. Burton JM, O'Connor P. Novel oral agents for multiple sclerosis. Curr Neurol Neurosci Rep. 2007;7:223-230. Abstract
4. Brinar V for the CAMMS223 Study Group. Alemtuzumab Phase 2 Extension Study Design (CAMMS223): assessing long-term outcomes and potential benefits of additional alemtuzumab treatment in patients with relapsing-remitting multiple sclerosis. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P17.
5. Naismith R, Trinkaus K, Fairbairn M, Lauber J, Piccio L, Cross A. Rituximab as add-on therapy for breakthrough disease: clinical effects over 24 weeks. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P476.
6. Neyer L, Singer R, Wang H, Caras I. Daclizumab exhibits efficacy in multiple sclerosis subjects positive for interferon-beta neutralizing antibodies. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P479.
7. Hawker K. Efficacy and safety of rituximab in patients with primary progressive multiple sclerosis: results of a randomized, double-blind, placebo-controlled, multicenter trial. Parallel Session 10 of Late Breaking News of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Scientific Program S78.
8. Dörner T, Burmester GR. New approaches of B-cell-directed therapy beyond rituximab. Curr Opin Rheumatol. 2008;20:263-268. Abstract
9. Guarnaccia J, Rinder H, Smith B. Preferential effects of cladribine on lymphocyte subpopulations. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P55.
10. Laugel B, Challier J, Siegfried C, Chvatchko Y, Weissert R, Galibert L. Cladribine exerts a modulatory effect on T-cell activation. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P80.
11. Rieckmann P, Giovannoni G, Cook S, et al, for the CLARITY Study Group. Cladribine tablets in relapsing-remitting multiple sclerosis: study design of the 2-year, phase III b CLA RITY (CLA dRibine tablets Treating multiple sclerosis orallY) extension study. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P453.
12. Kappos L, Radue E, O'Connor P, et al., for the FREEDOMS Study Group. Oral fingolimod (FTY 720) in patients with relapsing multiple sclerosis: 3-year results from a phase II study extension. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P72.
13. Kappos L, Polman C, Radue E, et al. Oral fingolimod (FTY 720) in relapsing-remitting multiple sclerosis: baseline patient demographics and disease characteristics from a 2-year phase III trial (FREEDOMS). Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P73.
14. Montalban X, Comi G, Anel J, et al. Oral fingolimod (FTY 720) in relapsing multiple sclerosis: impact on health-related quality of life in a phase II study Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P400.
15. MacManus D, Miller D, Kappos L, R. Gold, et al. The effect of BG00012 on conversion of gadolinium-enhancing lesions to T1-hypointense lesions. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P459.
16. Gold R, Kappos L, Miller D, et al. Safety profile of BG00012, an oral formulation of dimethyl fumarate for patients with relapsing MS. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P50.
17. Tallantyre E, Evangelou N, Constantinescu CS. Spotlight on terfilunomide. Int MS J. 2008;15:62-68. Abstract
18. Comi G, Abramsky O, Arbizu T, et al., for the LAQ/5062 Clinical Advisory Board and Study Group. Oral laquinimod in patients with relapsing-remitting multiple sclerosis: 9-month double-blind active extension of the multi-center, randomized, double-blind, parallel-group placebo-controlled study. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P31.
19. Gold R. Combination therapies in multiple sclerosis. Neurology. 2008;255 Suppl 1:51-60.
20. Vollmer T, Panitch H, Bar-Or A, et al. Glatiramer acetate after induction therapy with mitoxantrone in relapsing multiple sclerosis. Mult Scler. 2008;14:663-670. Abstract
21. Le Page E, Leray E, Taurin G, et al. Mitoxantrone as induction treatment in aggressive relapsing remitting multiple sclerosis: treatment response factors in a 5 year follow-up observational study of 100 consecutive patients. J Neurol Neurosurg Psychiatry. 2008;79:52-56. Abstract
22. Filippi M, Le Page E, Leray E, Edan G, Comi G. Magnetic resonance imaging results of a 3-year randomized trial comparing two therapeutic strategies in aggressive relapsing-remitting multiple sclerosis: mitoxantrone as induction for 6 months followed by interferon-b-1b versus interferon-b-1b. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P254.
23. Perumal J, Hreha S, Caon C, et al. Intense immunosuppression as the initial disease-modifying therapy in clinically active relapsing multiple sclerosis. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P490.
24. Ramathal J, Boggild M. Glatiramer acetate following mitoxantrone induction in relapsing-remitting multiple sclerosis: extended experience. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P498.
25. Balcer L. OCT: window on multiple sclerosis. Parallel Session 5 of Advances in Imaging Techniques of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Scientific Program S43.
26. Garcia-Montojo M, Alvarez-Lafuente R, Dominguez-Mozo M, De las Hera V, Bartolome F, Arroyo R. MxA and MMP-9/TI MP-1 ratio as biomarkers of treatment efficacy and disease activity in multiple sclerosis patients. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster 452.
27. Melnikov A, Scholtens D, Reder A, Balabanov R, Stefoski D, Levenson V. Composite methylation profiles of blood DNA as biomarkers for multiple sclerosis. Disease-modifying therapy-part 2. Program and abstracts of the World Congress on Treatment and Research in Multiple Sclerosis; September 17-20, 2008; Montreal, Quebec, Canada. Poster P869.


Interviewer: Elizabeth Samander, PhD, Scientific Director, Medscape LLC

Interviewee: Edward J. Fox, MD, PhD, Clinical Assistant Professor, University of Texas Medical Branch, Round Rock, Texas

Disclosure for Interviewer: Elizabeth Samander, PhD, is a member of the professional editorial group at Medscape and has reported no relevant financial relationships.

Disclosure for Interviewee: Edward J. Fox, MD, PhD, has disclosed that he has received grants for clinical research from Biogen-Idec, BioMS, EMD-Serono, Genzyme, Opexa Therapeutics, Sanofi-Aventis, and Teva Neuroscience. Dr. Fox has also disclosed that he has received grants for educational activities from Bayer, Biogen-Idec, EMD-Serono, Pfizer, and Teva Neuroscience. Dr. Fox has also disclosed that he has served as an advisor or consultant to Bayer, Biogen-Idec, EMD-Serono, Genzyme, Opexa Therapeutics, and Teva Neuroscience.

Merck Serono Announces Initiation of the ORACLE MS Trial to Evaluate Cladribine Tablets in Patients at Risk of Developing Multiple Sclerosis

• ORACLE MS Phase III trial will assess effectiveness of cladribine tablets in preventing conversion to definite multiple sclerosis in addition to the fully enrolled Phase III pivotal trial – the CLARITY study – for treatment of relapsing forms of multiple sclerosis

Geneva, Switzerland, September 18, 2008 – Merck Serono, a division of Merck KGaA, Darmstadt, Germany, announced today the initiation of a Phase III trial to evaluate the therapeutic effects of its proprietary oral formulation of cladribine (cladribine tablets) in patients at risk of developing multiple sclerosis (MS).

The trial, called ORACLE MS (ORAl CLadribine in Early MS) will evaluate the safety and efficacy of two dosage regimens of cladribine tablets versus placebo in the treatment of patients who have experienced a first clinical event suggestive of MS. Cladribine tablets are currently also being evaluated in a fully enrolled Phase III pivotal trial – the CLARITY1 study – for treatment of relapsing forms of MS. As announced in January 2007, CLARITY was the first pivotal trial among all Phase III oral compounds in development for MS to complete enrollment. Cladribine tablets have been granted a fast track designation by the US Food and Drug Administration.

“There is increasing evidence supporting the initiation of treatment with a disease-modifying drug in patients who have experienced a first clinical event suggestive of multiple sclerosis, an initial stage of the disease when clinical manifestations are not necessarily pronounced but where the potential exists for irreversible neurological damage to take place,” said Dr. Thomas Leist, Associate Professor of Neurology and Director of the Comprehensive MS Center at Thomas Jefferson University, Philadelphia, PA, and an investigator in the ORACLE MS study. “The ORACLE MS study will evaluate the effectiveness and safety of cladribine tablets in preventing conversion to definite multiple sclerosis.”

“As a leader in multiple sclerosis treatments, we are committed to providing new options that can further improve the course of the disease and the quality of life for people living with this disease,” said Dr. Richard Douge, Executive Vice President, Global Marketing, Merck Serono. “The initiation of the ORACLE MS study further demonstrates our commitment to continue to build a solid portfolio of products for use in a broad multiple sclerosis patient population. We believe that our proprietary oral formulation of cladribine has the potential to address an important unmet medical need at a critical time of disease development.”

The ORACLE MS study is a randomized, double-blind, placebo-controlled, international trial. It will involve more than 600 patients considered at risk of developing MS due to a recently experienced isolated demyelinating event (e.g. optic neuritis, myelopathy or brainstem syndrome) and having MRI brain scans consistent with early signs of MS. Study participants will be randomized in one of the three arms of the study to receive one of two different dosage regimens of cladribine tablets or matching placebo tablets (1:1:1 ratio).

Patients will be treated for a period of two years (96 weeks), or up to the time when they experience a second attack leading to a diagnosis of clinically definite MS, in which case they would be offered open-label treatment with Rebif® 44 mcg three times a week for a 96-week maintenance treatment period. Patients who do not convert to clinically definite MS within the initial 96-week period of the study will be eligible to enroll in a 96-week long-term follow-up treatment period. These maintenance and long-term follow-up periods of the study are intended to assess the effect of early treatment with cladribine tablets on relapses and subsequent treatment response to disease-modifying therapy for relapsing-remitting MS and to evaluate the sustained effect of cladribine tablets in delaying the development of definite MS.

In the study, cladribine tablets are given in two or four treatment cycles in the first year, with each cycle consisting of once daily administration for four to five consecutive days, which means study patients take cladribine tablets for only 8 to 20 days during that year. In the second year, two treatment cycles are administered to all patient groups.

The primary endpoint of the ORACLE MS trial is time to conversion to MS, according to the McDonald criteria. Other endpoints include time to conversion to clinically definite MS according to the Poser criteria (the main secondary endpoint), assessments of MRI brain scans, and disability progression.

Approximately 200 medical centers globally are expected to participate in this trial.
1 CLARITY: CLAdRIbine Tablets Treating MS OrallY

About cladribine tablets

Merck Serono’s proprietary oral formulation of cladribine is currently being evaluated in Phase III as a treatment for patients with relapsing forms of multiple sclerosis (MS). Cladribine is a small molecule that may interfere with the behavior and the proliferation of certain white blood cells, particularly lymphocytes, which are thought to be involved in the pathological process of MS.

About Rebif®

Rebif® (interferon beta-1a) is a disease-modifying drug used to treat relapsing forms of multiple sclerosis (MS) and is similar to the interferon beta protein produced by the human body. The efficacy of Rebif® in chronic progressive MS has not been established. Interferons are thought to help modulate the body’s immune system and reduce inflammation. The exact mechanism is unknown.

Rebif®, which was approved in Europe in 1998 and in the US in 2002, is registered in more than 80 countries worldwide. Rebif® has been proven to delay the progression of disability, reduce the frequency of relapses and reduce MRI lesion activity and area*. Rebif® is available in a 22 microgram and 44 microgram ready-to-use pre-filled syringe and a titration pack (8.8 micrograms).

Rebif® should be used with caution in patients with a history of depression, liver disease and seizures. Most commonly reported side effects are flu-like symptoms, injection site disorders, elevation of liver enzymes and blood cell abnormalities. Patients, especially those with depression, seizure disorders, or liver problems, should discuss treatment with Rebif® with their doctors. For more information about Rebif®, please visit www.mslifelines.com for prescribing information.

* The exact correlation between MRI findings and the current or future clinical status of patients, including disability progression, is unknown.

About Merck Serono and multiple sclerosis

Merck Serono is a leader in multiple sclerosis (MS) with Rebif® (interferon beta-1a), a disease-modifying drug used to treat relapsing forms of MS, which is registered in more than 80 countries worldwide. Full prescribing information for this product can be obtained by contacting the Company or visiting its website. Additional therapeutic options are currently under development at Merck Serono, including cladribine tablets, currently in Phase III and potentially the first oral therapy for MS, as well as several products in early stage development. Merck Serono also is taking a leading role in developing an understanding of the role of genetics in MS.
About multiple sclerosis

Multiple sclerosis (MS) is a chronic, inflammatory condition of the nervous system and is the most common, non-traumatic, disabling neurological disease in young adults. The World Health Organization estimates that up to 2.5 million people suffer from MS worldwide. While symptoms can vary, the most common symptoms of MS include blurred vision, numbness or tingling in the limbs and problems with strength and coordination. The relapsing forms of MS are the most common.

About Merck Serono

Merck Serono is the division for innovative prescription pharmaceuticals of Merck, a global pharmaceutical and chemical group. Headquartered in Geneva, Switzerland, Merck Serono discovers, develops, manufactures and markets innovative small molecules and biopharmaceuticals to help patients with unmet medical needs. Its North American business operates in the United States and Canada as EMD Serono.

Merck Serono has leading brands serving patients with cancer (Erbitux®), multiple sclerosis (Rebif®), infertility (Gonal-f®), endocrine and cardiometabolic disorders (Glucophage®, Concor®, Euthyrox®, Saizen®, Serostim®), as well as psoriasis (Raptiva®).
With an annual R&D expenditure of around € 1bn, Merck Serono is committed to growing its business in specialist-focused therapeutic areas including neurodegenerative diseases, oncology, fertility and endocrinology, as well as new areas potentially arising out of research and development in autoimmune and inflammatory diseases.

About Merck

Merck is a global pharmaceutical and chemical company with total revenues of € 7.1 billion in 2007, a history that began in 1668, and a future shaped by 31,946 employees in 60 countries. Its success is characterized by innovations from entrepreneurial employees. Merck's operating activities come under the umbrella of Merck KGaA, in which the Merck family holds an approximately 70% interest and free shareholders own the remaining approximately 30%. In 1917 the U.S. subsidiary Merck & Co. was expropriated and has been an independent company ever since.

For more information, please visit www.merckserono.net or www.merck.de