Insmed Announces First Human Bioequivalence Data for a Follow-on Biologic by a U....( Company Intends to Request Meeting ...),Health

Company Intends to Request Meeting with FDA Regarding Possible Phase III

Trial Based on Human Data Demonstrating Bioequivalence of INS-19 to

Neupogen(R)

RICHMOND, Va., July 10, 2008 /PRNewswire-FirstCall/ -- Insmed Inc. (Nasdaq: INSM), a developer of follow-on biologics and biopharmaceuticals for unmet medical needs, today announced that it has demonstrated the bioequivalence of INS-19, the company's recombinant human granulocyte colony stimulating factor (G-CSF), compared to Neupogen(R), an FDA-approved G-CSF product for the treatment of neutropenia that recorded 2007 sales of approximately $1 billion.

Human bioequivalence studies utilize well-established, FDA-recognized methodology with rigorous standards. Results of this clinical study demonstrated bioequivalence between INS-19 and Neupogen(R). G-CSF concentration profiles for the two products were identical. Absolute neutrophil count, the primary pharmacodynamic marker for G-CSF products, exhibited the same response profile to dosing with INS-19 as with Neupogen(R). These human INS-19 and Neupogen(R) data complement Insmed's extensive analytical testing and comparative data from pre-clinical assessments.

"These results are very exciting, as they represent Insmed's ability to replicate a protein product, to bring that product rapidly through the clinic and to demonstrate clear bioequivalence to the innovator drug," said Dr. Geoffrey Allan, President and CEO of Insmed. "To our knowledge, we are the first U.S. company to report human bioequivalence data for a follow-on biologic product, validating the idea that follow-on biologics can be a scientific reality in the U.S. and that Insmed is well positioned to be a leader in the fie
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