Prometheus Laboratories Inc. Release: ENTOCORT(R) EC (Budesonide) Capsules Recommended By The American Gastroenterology Association As First-Line Therapy For The Treatment Of Mild-To-Moderate Crohn’s Disease

SAN DIEGO, June 5 /PRNewswire-FirstCall/ -- Prometheus Laboratories Inc., a specialty pharmaceutical company, today announced that the latest American Gastroenterological Association position statement recommends ENTOCORT(R) EC (budesonide) Capsules as the first-line therapy for the treatment of mild-to-moderate ileal and right-sided colonic Crohn’s disease.(1) ENTOCORT EC is a non-systemic glucocorticosteroid and is the only pharmacological product indicated for the treatment of mild to moderate active Crohn’s disease involving the ileum and/or the ascending colon for both induction and maintenance therapies.* Because ENTOCORT EC has low systemic bioavailability, it has reduced side effects compared to traditional oral corticosteroids, such as prednisolone.(2)

The position statement was included in an American Gastroenterological Association Institute Technical Review on Corticosteroids, Immunomodulators, and Infliximab in Inflammatory Bowel Disease (IBD) which was published in the March 2006 issue of Gastroenterology. The conclusions in the Technical Review represent the evaluation of treatment options for inflammatory bowel diseases. The Technical Review was authored by Drs. Gary R. Lichtenstein, Maria T. Abreu, Russell Cohen and William Tremaine.

“These evidence-based recommendations can significantly impact the treatment of over 500,000 Crohn’s disease patients,” said Dr. Gary Lichtenstein. “The recommendations took over a year to develop with numerous health care professionals providing input on the final publication. These recommendations represent the best of current practice for treating inflammatory bowel diseases.”

Under the position statement, ENTOCORT EC therapy was recommended as effective for the maintenance of short-term remission. The position statement further states that the use of conventional corticosteroids, such as prednisone, should generally be reserved for patients with moderate to severe disease who failed to respond to first-line therapies for IBD such as mesalamine (for ulcerative colitis) or budesonide (for Crohn’s disease).(1)

ENTOCORT EC Background

ENTOCORT EC is a first-line therapy and the only pharmacological product indicated for both induction and maintenance of mild to moderate active Crohn’s disease involving the ileum and/or the ascending colon, the sites of disease for approximately 70% of patients.(2,3) ENTOCORT EC is a non-systemic glucocorticosteroid, which means that it works locally or in one area of the body. The most common side effects of ENTOCORT EC observed in clinical trials were headache, respiratory infection, nausea and symptoms of hypercorticism.

Crohn’s disease is a chronic inflammatory bowel disease of unknown origin. An estimated 500,000 Americans have the disorder. Flare-ups of the disease can range from mild to severe and involve symptoms such as diarrhea, abdominal pain, fever and sometimes rectal bleeding. The condition can be difficult to manage clinically and consumes a substantial amount of healthcare resources in terms of physician time, procedures and medications.

AstraZeneca LP launched ENTOCORT EC in November 2001. Prometheus entered into an agreement with AstraZeneca LP for the marketing, sales and distribution of ENTOCORT EC beginning in January 2005.

Please see full Prescribing Information available at www.EntocortEC.com and 1-888-423-5227.

About Prometheus

Prometheus Laboratories Inc. is a specialty pharmaceutical company committed to developing new ways to help physicians individualize patient care. Prometheus focuses on the treatment, diagnosis and detection of gastrointestinal, autoimmune and inflammatory diseases and disorders. Prometheus’ strategy includes the marketing and delivery of pharmaceutical products complemented by its proprietary, high-value diagnostic testing services. By integrating therapeutics and diagnostic services, Prometheus addresses the continuum of patient care, thereby providing physicians with a comprehensive solution to treat chronic diseases. Prometheus’ corporate offices are located in San Diego, California. Additional information about Prometheus can be found at www.prometheuslabs.com.

This press release contains certain “forward looking” statements within the meaning of the Private Securities Litigation Reform Act of 1995. To the extent that any statements made in the news release contain information that is not historical, these statements are essentially forward-looking and are subject to risks and uncertainties. Actual events or results may differ materially from those projected in any of such statement due to various factors. Prometheus cautions that any forward-looking information is not a guarantee of future performance. There can be no assurance that the Company can successfully commercialize, penetrate or grow the market for ENTOCORT EC for a variety of reasons. The Company is aware of other products under development and in clinical testing for the treatment of Crohn’s disease. It is difficult to predict the impact of competitive products and pricing and new product development and commercialization. There can be no assurance that the Company can successfully commercialize, penetrate or grow the market for any of its products.

*For Crohn’s disease involving the ileum and/or ascending colon, ENTOCORT EC is indicated for the treatment of mild to moderate active disease (up to 8 weeks with repeated 8-week courses as necessary) and the maintenance of clinical remission of mild to moderate disease for up to an additional 3 months.

ENTOCORT is a registered trademark of the AstraZeneca group of companies. PROMETHEUS is a trademark of Prometheus Laboratories Inc.

References 1. Lichtenstein GR, Abreu MT, Cohen R, Tremaine W. American Gastroenterological Association Institute Technical Review on Corticosteroids, Immunomodulators, and Infliximab in Inflammatory Bowel Disease. Gastroenterology 2006;30:940-987. 2. ENTOCORT EC package insert. 3. Allan RN. Crohn’s disease of the small intestine - ileum and right colon. In: Allan RN, Rhodes JM, Hanauer SB, eds. Inflammatory Bowel Diseases. New York, NY: Churchill Livingstone, 1997:589-595.

Prometheus Laboratories Inc.

CONTACT: Beth Kriegel, Senior Director, Finance & Investor Relations ofPrometheus Laboratories Inc., +1-858-410-2516

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