( CAMBRIDGE Mass.--(BUSINESS WIRE)--Jun ...)Archemix Announces Completion of Phase 1 Trial of ARC1779,Health

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Jun 8, 2007 - Archemix Corp., a biotechnology company focused on discovering and developing aptamers, announced the successful completion of a Phase 1 study of its novel aptamer therapeutic, ARC1779. ARC1779 is designed to selectively block the activation, adhesion and aggregation of platelets by inhibiting the binding of von Willebrand Factor (vWF) to the GPIb receptor on platelets. Activated vWF is scientifically recognized as the first stage of arterial thrombus formation and plays a significant role in the development of harmful blood clots. Archemix plans to develop ARC1779 as an anti-thrombotic drug for use in angioplasty and in a rare blood disorder that is mediated by vWF known as thrombotic thrombocytopenic purpura, or TTP.

Archemix plans to present a complete data set from this Phase 1 clinical trial within a peer-reviewed forum in 2007.

Based on the proof-of-mechanism data from this Phase 1 study, Archemix plans to commence a Phase 2 study of ARC1779 to evaluate the safety and efficacy of ARC1779 in acute coronary syndrome patients during the fourth quarter of 2007. Additionally, Archemix plans to initiate a Phase 1b study of ARC1779 in patients suffering from TTP in the fourth quarter of 2007. Approximately 3,000 new cases of TTP are diagnosed per year in the United States, but currently there is no approved drug therapy for the disease.

"We are very pleased to demonstrate ARC1779 can inhibit vWF activation and platelet function, which are both widely recognized as playing critical roles in clot formation which can critically impede blood flow to the heart," said Jim Gilbert, M.D., Chief Medical Officer, Archemix. "In Phase 2, we hope to show that using ARC1779 during angioplasty may improve myocardial perfusion by reducing blood clots in the coronary microcirculation while also providing effective anti-thrombotic treatment at the primary site of arte
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