Repligen Corporation announced that it has entered into an exclusive worldwide licensing agreement with Pfizer Inc. to advance Repligen's spinal muscular atrophy (SMA) program, originally in-licensed from Families of SMA (FSMA). The SMA program includes RG3039, a small molecule drug candidate in clinical development for SMA, as well as backup compounds and enabling technologies. Under the terms of the agreement, Repligen is entitled to receive up to $70 million from Pfizer, commencing with an upfront payment of $5 million and total potential future milestone payments of up to $65 million as well as royalties on any future sales of SMA compounds developed under the agreement.

SMA is an orphan neurodegenerative genetic disease that presents early in life. Under the terms of the agreement, Repligen is responsible for completing the first two cohorts of an active Phase 1 trial evaluating RG3039 in healthy volunteers, which it anticipates will occur during the first quarter of 2013. Repligen will also provide certain technology transfer services to Pfizer, who will then assume full responsibility for the SMA program moving forward, including the conduct of any registration trials necessary for product approval.

Repligen has previously received U.S. Orphan Drug and Fast Track designations for RG3039 for the treatment of SMA, as well as Orphan Medicinal Product designation in the EU. Families of SMA, a patient organization dedicated to funding research to advance therapies for SMA, funded and directed the preclinical development of RG3039 with an investment of more than $13 million. This was the first drug discovery program ever conducted specifically for SMA.

Repligen's research and clinical efforts, including the current Phase 1b trial, have been partially supported by a $1.4 million grant from the Muscular Dystrophy Association.