Leverkusen, November 28, 2011 – Bayer HealthCare and Regeneron Pharmaceuticals, Inc. today announced that they have initiated a Phase III clinical trial evaluating the efficacy and safety of VEGF Trap-Eye (aflibercept) in the neovascular form of age-related macular degeneration (wet AMD) in China. The new trial, named SIGHT, will include approximately 300 patients and will be the largest retinal trial conducted in China. SIGHT is being led by Bayer. “Currently, only photodynamic therapy with verteporfin is approved as a treatment for wet AMD in China, and it is only approved for the subpopulation of patients with predominantly classic wet AMD,” said Kemal Malik, M.D., Head of Global Development and member of the Bayer HealthCare Executive Committee. “After reporting positive data from our large VIEW program in wet AMD, we look forward to potentially bringing this new treatment to patients with wet AMD in China." About the SIGHT Trial The SIGHT (VEGF Trap-Eye: Investigation of Efficacy and Safety in Chinese patients with wet AMD) trial consists of a randomized, double-masked, Phase III clinical trial evaluating VEGF Trap-Eye in the treatment of the neovascular form of age-related macular degeneration (wet AMD). VEGF Trap-Eye will be evaluated for its effect on improving and maintaining vision when dosed as an intravitreal injection on a schedule of 2 milligrams (mg) every two months (following three initial monthly doses), as compared with Photodynamic Therapy (PDT) with verteporfin. After assessment of the primary endpoint at week 28, all patients, including those on PDT, will receive VEGF Trap-Eye treatment until the end of the study at week 52. Bayer and Regeneron Initiate Phase III Clinical Trial for the Treatment of Wet Age-Related Macular Degeneration in China

About Wet AMD Age-related Macular Degeneration (AMD) is a leading cause of acquired blindness. Macular degeneration is diagnosed as either dry (non-exudative) or wet (exudative). In wet AMD, new blood vessels grow beneath the retina and leak blood and fluid. This leakage causes disruption and dysfunction of the retina creating blind spots in central vision, and it can account for blindness in wet AMD patients. Wet AMD is the leading cause of blindness for people over the age of 65 in the U.S. and Europe. In China, there were an estimated 540,000 newly diagnosed wet AMD patients over the age of 50 in 2010. About VEGF Trap-Eye (aflibercept) Vascular Endothelial Growth Factor (VEGF) is a naturally occurring protein in the body. Its normal role in a healthy organism is to trigger formation of new blood vessels (angiogenesis) supporting the growth of the body's tissues and organs. However, in certain diseases, such as wet age-related macular degeneration, it is also associated with the growth of abnormal new blood vessels in the eye, which exhibit abnormal increased permeability that leads to edema. Scarring and loss of fine-resolution central vision often results.

VEGF Trap-Eye is a recombinant fusion protein consisting of portions of human VEGF receptors 1 and 2 extracellular domains fused to the Fc portion of human IgG1 and formulated as an iso-osmotic solution for intravitreal administration. VEGF Trap-Eye acts as a soluble decoy receptor that binds VEGF-A and placental growth factor (PlGF) with higher affinity than their natural receptors, and thereby can inhibit the binding and activation of these cognate VEGF receptors. Regeneron and Bayer HealthCare are collaborating on the global development of VEGF Trap-Eye for the treatment of neovascular age-related macular degeneration (wet AMD), central retinal vein occlusion (CRVO), diabetic macular edema (DME), and other eye diseases and disorders. Recently Regeneron has received approval from the U.S. Food and Drug Administration (FDA) for EYLEATM Intravitreal Injection, known as VEGF Trap-Eye, for the treatment of patients with wet age-related macular degeneration (wet AMD). Bayer submitted an application for marketing authorization in Europe and Japan in wet AMD in the first half of 2011.

Bayer HealthCare will market VEGF Trap-Eye outside the United States, where the companies will share equally the profits from any future sales of VEGF Trap-Eye. Regeneron maintains exclusive rights to EYLEA in the United States. About Regeneron Pharmaceuticals Regeneron is a fully integrated biopharmaceutical company that discovers, invents, develops, manufactures, and commercializes medicines for the treatment of serious medical conditions. Regeneron markets two products, ARCALYST® (rilonacept) Injection for Subcutaneous Use and EYLEA™ (aflibercept) Injection. Regeneron also has completed several Phase III studies and is conducting an additional Phase III clinical trial for the product candidate ZALTRAP® (aflibercept) Concentrate for Intravenous Infusion. Additional therapeutic candidates developed from proprietary Regeneron technologies for creating fully human monoclonal antibodies are in earlier stage development programs in rheumatoid arthritis and other inflammatory conditions, pain, cholesterol reduction, allergic and immune conditions, and cancer.

Additional information about Regeneron and recent news releases are available on the Regeneron web site at www.regeneron.com. About Bayer HealthCare The Bayer Group is a global enterprise with core competencies in the fields of health care, nutrition and high-tech materials. Bayer HealthCare, a subgroup of Bayer AG with annual sales of EUR 16.9 billion (2010), is one of the world’s leading, innovative companies in the healthcare and medical products industry and is based in Leverkusen, Germany. The company combines the global activities of the Animal Health, Consumer Care, Medical Care and Pharmaceuticals divisions. Bayer HealthCare’s aim is to discover and manufacture products that will improve human and animal health worldwide. Bayer HealthCare has a global workforce of 55,700 employees (Dec 31, 2010) and is represented in more than 100 countries.

Find more information at www.bayerhealthcare.com.