Date:3/30/2011

ntary active control agent (anivamersen, a.k.a. RB007).  Anivamersen can be used to selectively completely or partially reverse the anticoagulant effect of pegnivacogin.  REG1, having recently completed phase 2b clinical development (the RADAR trial), is intended for application in arterial thrombosis indications, such as Acute Coronary Syndrome patients undergoing Percutaneous Coronary Intervention.  A clinical program in Open Heart Surgery [including coronary artery bypass grafting (CABG) and valve repair/replacement] is also under development.  REG2, Regado's second product candidate, consists of a subcutaneously administered depot formulation of pegnivacogin paired with the IV bolus formulation of anivamersen.  REG2 recently completed single escalating dose phase 1 clinical testing (the first successful subcutaneous application of an aptamer in humans) and is planned to be studied in a multiple escalating dose clinical trial in 2011.  It is intended for use in venous thrombosis indications such as venous thromboembolism (VTE) prophylaxis in patients undergoing abdominal surgery.  REG3, Regado's third program, consists of a specific GPVI inhibitor and its active control agent (RB571 and RB515, respectively).  REG3 is planned to enter phase 1 human clinical testing in 2011 and will be indicated for antiplatelet therapy.  Information pertaining to Regado's clinical programs may be obtained at www.clinicaltrials.gov.

ABOUT APTAMERS

Pegnivacogin is a member of a class of compounds called aptamers.  Aptamers are single stranded oligonucleotides that adopt a specific conformation enabling direct, specific inhibition of the targeted protein.  A key unique feature of aptamers derives from the fact that they are formed from nucleic acids. As such, their pharmacologic activity can be controlled by a matched, complementary oligonucleotide active control a
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