GENEVA, Switzerland, March 21 /PRNewswire-FirstCall/ -- Merck Serono S.A. (virt-x: SEO and NYSE: SRA) announced today that the preliminary fourth quarter and full-year consolidated results for the period ended December 31, 2006, which were published on March 1, 2007, are confirmed. The audited detailed consolidated financial statements are appended. They have been prepared on the basis of International Financial Reporting Standards. The accompanying notes to these 2006 full-year consolidated financial statements will be available upon the release of Merck Serono's 2006 Annual Report by end April 2007. Forward-looking statements Some of the statements in this press release are forward looking. Such statements are inherently subject to known and unknown risks, uncertainties and other factors that may cause actual results, performance or achievements of Merck Serono S.A. and affiliates to be materially different from those expected or anticipated in the forward-looking statements. Forward-looking statements are based on Merck Serono's current expectations and assumptions, which may be affected by a number of factors, including those discussed in this press release and more fully described in Serono's Annual Report on Form 20-F filed with the U.S. Securities and Exchange Commission on February 28, 2006. These factors include any failure or delay in Merck Serono's ability to develop new products, any failure to receive anticipated regulatory approvals, any problems in commercializing current products as a result of competition or other factors, our ability to obtain reimbursement coverage for our products, the outcome of any government investigations and litigation. Merck Serono is providing this information as of the date of this press release, and has no responsibility to update the forward-looking statements contained in this press release to reflect events or circumstances occurring after the date of this press release. About Merck Serono S.A. Merck Serono S.A. is a global biotechnology leader, with sales in over 90 countries. The Company is the world leader in reproductive health, with Gonal-f(R), Luveris(R) and Ovidrel(R)/Ovitrelle(R). It has strong market positions in neurology, with Rebif(R), as well as in metabolism and growth, with Saizen(R), Serostim(R) and Zorbtive(TM). The Company has recently entered the psoriasis area with Raptiva(R). Merck Serono's research programs are focused on growing these businesses and on establishing new therapeutic areas, including oncology and autoimmune diseases. Bearer shares of Merck Serono S.A., the holding company, are traded on the virt-x (SEO) and its American Depositary Shares are traded on the New York Stock Exchange (SRA). About Merck Merck is a global pharmaceutical and chemical company with sales of EUR 6.3 billion in 2006, a history that began in 1668, and a future shaped by about 35,000 employees (including Merck Serono) in 56 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 a 70% interest and free shareholders own the remaining 30%. In 1917 the U.S. subsidiary Merck & Co. was expropriated and has been an independent company ever since. A full version of this release, including tables, is available at http://www.merckserono.net/ DATASOURCE: Merck Serono International SA CONTACT: Merck Serono: 9 Chemin des Mines, 1202 Geneva, Switzerland, http://www.merckserono.net/. Corporate Media Relations, Tel:+41-22-414-36-00. Media Relations, USA, Tel :+1-781-681-23-40. Corporate Investor Relations, Tel:+41-22-414-36-01. Investor Relations, USA, Tel:+1-781-681-25-52

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