Roche to Acquire Ventana for $89.50 per share

Roche and Ventana Reach Definitive Merger Agreement
Roche (SWX: ROG.VX; RO.S; OTCQX: RHHBY), a world-leading healthcare provider of pharmaceuticals and diagnostics, and Ventana Medical Systems ("Ventana") (NASDAQ:VMSI) today announced that they have signed a definitive merger agreement. Under the terms of the agreement, Roche will increase the purchase price in the tender offer for Ventana common shares to $89.50 per share in cash (or an aggregate of approximately $3.4 billion on a fully diluted basis), and Ventana's Board of Directors will recommend that Ventana's shareholders tender their shares to Roche. The merger agreement has been approved by the boards of Ventana and Roche. This offer represents a premium of 4.9% to Ventana's closing price on January 18, 2008, a 19.3% premium to Roche's initial offer on June 27, 2007, and a 72.3% premium to Ventana's closing price on June 22, 2007 (the last trading day prior to the announcement of Roche's initial offer). The acquisition of Ventana, a leader in the fast-growing histopathology (tissue-based diagnostics) segment, will allow Roche to broaden its diagnostic offerings and complement its world leadership in both in-vitro diagnostic systems and oncology therapies.
Under the terms of the merger agreement, Roche will amend its existing tender offer to acquire all of the outstanding common shares of Ventana to reflect the terms of the merger agreement. The amended offer will increase the offer price to $89.50 per share in cash, expire at 7:00 p.m., New York City time on Thursday, February 7, 2008 and be subject to, among other things, the conditions that there are validly tendered and not withdrawn, a number of common shares that, together with the shares owned by Roche and its subsidiaries, represents a majority of the total number of common shares outstanding on a fully-diluted basis.
"We are very pleased that we were able to reach an agreement with Ventana. We believe that our offer provides significant value to Ventana's shareholders and that this acquisition ideally complements Roche's strengths. Our combined company will be uniquely positioned to further expand Ventana's business globally and together develop more cost-efficient, differentiated and targeted medicines. We are delighted to welcome the employees and management team of Ventana and look forward to jointly developing novel solutions for our customers," commented Franz B. Humer, Chairman and CEO of Roche.

Christopher Gleeson, Ventana's President and Chief Executive Officer, will continue as CEO of Ventana's business following completion of the transaction and become a member of the Roche Diagnostics Executive Committee. Ventana will remain based in Tucson, Arizona and its employees will become part of the combined company.

Commenting on the transaction, Ventana's President and CEO, Christopher Gleeson, said, "Ventana's Board of Directors has been dedicated to ensuring that any strategic value creation opportunities with Roche or other third parties would adequately reflect the inherent value of the company, its steady growth momentum, and the magnitude of potential synergies in a combination. After a full evaluation of its strategic alternatives and thoughtful consideration, as well as consultation with our outside financial and legal advisors, our Board believes that the transaction with Roche at $89.50 per share is in the best interests of our shareholders, and we recommend that our shareholders tender into this revised offer. We are very excited to join Roche in a transaction, which delivers significant value to our shareholders, creates tremendous opportunities for our employees and allows us to further advance the important work that we do at Ventana.
"I am confident that Ventana's unique position at the forefront of the emerging field of companion diagnostics and its robust growth in both advanced staining and primary staining ideally complements the strong position of Roche in the field of diagnostics and oncology over the long term."

Greenhill & Co. and Citi acted as financial advisors to Roche and Davis Polk & Wardwell acted as legal counsel. Merrill Lynch & Co. and Goldman Sachs acted as financial advisors and Sidley Austin LLP acted as a legal advisor to Ventana.

About Roche
Headquartered in Basel, Switzerland, Roche is one of the world's leading research-focused healthcare groups in the fields of pharmaceuticals and diagnostics. As the world's biggest biotech company and an innovator of products and services for the early detection, prevention, diagnosis and treatment of diseases, the Group contributes on a broad range of fronts to improving people's health and quality of life. Roche is the world leader in in-vitro diagnostics and drugs for cancer and transplantation, a market leader in virology and active in other major therapeutic areas such as autoimmune diseases, inflammation, metabolism and central nervous system. In 2006 sales by the Pharmaceuticals Division totaled CHF 33.3 billion, and the Diagnostics Division posted sales of CHF 8.7 billion. Roche employs roughly 75,000 people worldwide and has R&D agreements and strategic alliances with numerous partners, including majority ownership interests in Genentech and Chugai.
Roche's Diagnostics Division offers a uniquely broad product portfolio and supplies a wide array of innovative testing products and services to researchers, physicians, patients, hospitals and laboratories world-wide.
Roche commenced operations in the U.S. over 100 years ago and these operations include research and development centers that conduct leading-edge work in advancing disease detection and treatment. Our diagnostics and pharmaceuticals businesses in the U.S. employ more than 20,000 people and generate approximately $10 billion in sales (including Genentech), accounting for about 40% of the Roche Group's global annual revenues.