Prometheus Laboratories Inc. Presents Proprietary Oncology Diagnostic Platform at American Society of Clinical Oncology Annual Meeting

New Product Names for Recently Introduced MicroRNA-based Diagnostics Also Unveiled

SAN DIEGO, June 1 /PRNewswire/ -- Prometheus Laboratories Inc., a specialty pharmaceutical and diagnostic company, presented an overview of its proprietary oncology diagnostic platform yesterday at the American Society of Clinical Oncology (ASCO) Annual Meeting in Orlando.

In a presentation entitled "Profiling of Receptor Tyrosine Kinases (RTK) Activation in Circulating Tumor Cells (CTCs) in Metastatic Tumors Using Proximity Mediated Microarray Immunoassay," Prometheus demonstrated that its novel microarray platform can successfully detect the activation of key cancer pathways EGFR and HER2 in CTCs isolated from blood samples of patients with high specificity and sensitivity as high as a single cell. Testing of samples from frozen breast cancer tissues demonstrated concordance between reported HER2 status based on immunohistochemistry (IHC), a commonly used biopsy-based method, and the Prometheus diagnostic platform. Further, an analysis of CTCs from metastatic breast cancer patients showed that more than 50% of patients with HER2 negative primary tumors had CTCs with activated HER2 and approximately 30% of these patients had both activated and amplified HER2 over time. A copy of the presentation can be found on the Company's website at www.prometheuslabs.com.

"As our understanding of molecular targets and cancer pathways increases, so too does our need for sophisticated diagnostics," said Henry Pan, M.D., Ph.D., Chief Scientific and Medical Officer of Prometheus. "We believe the sensitivity and specificity of our proprietary diagnostics may help oncologists to optimize the choice of a growing number of targeted therapies for breast, lung, colorectal and other cancers. In addition, we believe the ability to isolate CTCs from whole blood and fine needle aspirates will be less invasive than current methods of biopsy and enable real-time, continuous monitoring of patients post-treatment."

Prometheus is currently implementing multiple studies in a clinical setting with an initial focus on metastatic breast cancer. The Company submitted an application for New York State approval in the first quarter of 2009 and anticipates the commercial launch of its first oncology diagnostic product thereafter upon completion of selected ongoing clinical studies.

New Product Names for MicroRNA-based Diagnostics

Prometheus also unveiled new product names at ASCO for three recently introduced microRNA-based diagnostics:

The Company acquired exclusive U.S. rights to the three tests from Rosetta Genomics in April 2009.

About Prometheus

Prometheus Laboratories Inc. is a specialty pharmaceutical and diagnostic company committed to developing and commercializing novel pharmaceutical and diagnostic products to help physicians individualize patient care. Prometheus is a leader in applying the principles of personalized medicine to the diagnosis and treatment of gastrointestinal diseases and intends to apply these principles to oncology. Its strategy includes the marketing and delivery of pharmaceutical products complemented by proprietary, high-value diagnostic testing services. By integrating pharmaceutical products and diagnostic testing services, Prometheus believes it can address the full continuum of care, thereby providing physicians with a comprehensive solution to treat chronic diseases. Prometheus' corporate offices are located in San Diego.

ProOnc TumorSource Dx, ProOnc Squamous Dx and ProOnc Mesothelioma Dx are trademarks of Prometheus Laboratories Inc.

CONTACT: Pete De Spain, Director, Investor Relations & Corporate
Communications of Prometheus Laboratories Inc., +1-858-587-4117,
pdespain@prometheuslabs.com

Web site: http://www.prometheuslabs.com/

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