Sangamo BioSciences Research Collaborators Awarded Grant From California Institute for Regenerative Medicine to Develop Zinc Finger Nuclease-Based Stem Cell Therapy for HIV/AIDS

Thursday, October 29, 2009 General News
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RICHMOND, Calif. Oct. 28 Sangamo BioSciences, Inc. (Nasdaq: SGMO) announced today that the California Institute for Regenerative Medicine (CIRM) has granted a $14.5 million Disease Team Research Award to develop an AIDS-related lymphoma therapy based on the application of its zinc finger nuclease (ZFN) gene-editing technology in stem cells. The four year grant supports an innovative research project conducted by a multidisciplinary team of investigators led by John Zaia, M.D. the Aaron D. and Edith Miller Chair in Gene Therapy and chair of virology, City of Hope. The grant application entitled "Zinc Finger Nuclease-Based Stem Cell Therapy for AIDS" won the highest score of all grants CIRM received in this 1st round of Disease Team Research Award funding.

"Sangamo scientists have developed a ZFN-mediated gene-editing technology that has been demonstrated to make hematopoietic stem cells and mature immune system cells resistant to HIV infection," said Dr. Zaia. "This will be the first test of whether hematopoietic stem cells made HIV resistant using Sangamo's technology can correct the disease. If successful, our work could open the door to ZFN-based cell therapies for other important diseases."

Patients homozygous for a natural mutation (the delta-32 mutation) in the CCR5 gene are resistant to HIV infection by blocking the ability of the virus to enter a cell. Building on this observation, a study published in the New England Journal of Medicine in 2009 reported a potential "cure" in an AIDS patient with leukemia after receiving a bone marrow transplant from a "matched" donor with this delta-32 CCR5 mutation. This approach transferred the hematopoietic stem cells (HSC) residing in the bone marrow from the delta-32 donor, and provided a self-renewable and lifelong source of HIV-resistant immune cells. After transplantation, this patient was able to discontinue all anti-HIV drug treatments, CD4 counts increased, and the viral load dropped to an undetectable level, demonstrating effective transplantation of protection from HIV infection.

This CIRM Disease Team Research Award proposes an approach to modify a patient's own HSC to circumvent the need to find matched donors that carry the delta-32 CCR5 mutation and while providing a renewable and long-lasting source of HIV-resistant cells. Specifically, the grant funds the development of a ZFN approach to treat AIDS patients by first isolating their HSC, modifying them using CCR5-specific ZFNs, and then re-infusing them to reconstitute the immune system with CCR5-negative, HIV-resistant immune cells.

"We are delighted that this research proposal was chosen for funding by CIRM," commented Dr. Philip Gregory, Sangamo's chief scientific officer and vice president, research. "This grant brings together a team of world-renowned experts to develop this novel ZFN-based stem cell therapy for AIDS-related lymphoma through to the clinic. We look forward to working with the team which includes Paula Cannon, Ph.D., associate professor of Molecular Microbiology & Immunology, Keck School of Medicine of the University of Southern California, who has carried out extensive pre-clinical research using our technology in stem cells, and Dr. Zaia and his colleagues at City of Hope who are pioneers in hematopoietic cell transplantation."

"CIRM support for this program is a major validation of our ZFP Therapeutics platform both scientifically and financially and we are very pleased to be part of the exceptional team that received the highest score of all of the grants reviewed by CIRM," said Edward Lanphier, Sangamo's president and CEO.

The CIRM Disease Team Research Awards will fund actively managed multidisciplinary teams engaged in milestone-driven translational research for the development of stem cell-based therapies. The mission of these teams will be to conduct the necessary research and regulatory activities to prepare and file a complete, well supported Investigational New Drug Application (IND) with the Food and Drug Administration (FDA) (and, if desired, other regulatory agencies), to enable Phase I clinical testing.

About Sangamo

Sangamo BioSciences, Inc. is focused on the research and development of novel DNA-binding proteins for therapeutic gene regulation and modification. The most advanced ZFP Therapeutic(TM) development program is currently in Phase 2 clinical trials for evaluation of safety and clinical effect in patients with diabetic neuropathy and ALS. Sangamo also has two Phase 1 clinical trials to evaluate safety and clinical effect of a ZFP Therapeutic for the treatment of HIV/AIDS. Other therapeutic development programs are focused on cancer, neuropathic pain, nerve regeneration, Parkinson's disease and monogenic diseases. Sangamo's core competencies enable the engineering of a class of DNA-binding proteins known as zinc finger DNA-binding proteins (ZFPs). By engineering ZFPs that recognize a specific DNA sequence Sangamo has created ZFP transcription factors (ZFP TF) that can control gene expression and, consequently, cell function. Sangamo is also developing sequence-specific ZFP Nucleases (ZFN) for gene modification. Sangamo has established strategic partnerships with companies in non-therapeutic applications of its technology including Dow AgroSciences, Sigma-Aldrich Corporation and several companies applying its ZFP technology to engineer cell lines for the production of protein pharmaceuticals. For more information about Sangamo, visit the company's web site at

This press release may contain forward-looking statements based on Sangamo's current expectations. These forward-looking statements include, without limitation, references to the research and development of novel ZFP TFs and ZFNs and their applications in the treatment of HIV/AIDS, receipt of funds from CIRM, strategic partnerships with collaborators and clinical trials of ZFP Therapeutics. Actual results may differ materially from these forward-looking statements due to a number of factors, including technological challenges, Sangamo's ability to develop commercially viable products and technological developments by our competitors. See the company's SEC filings, and in particular, the risk factors described in the company's Annual Report on Form 10-K and its most recent quarterly report on Form 10-Q. Sangamo BioSciences, Inc. assumes no obligation to update the forward-looking information contained in this press release.

SOURCE Sangamo BioSciences, Inc.

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