On February 23, 2016 ZIOPHARM Oncology, Inc. (Nasdaq:ZIOP), a biopharmaceutical company focused on new cancer immunotherapies, reported the publication of a study in Scientific Reports, a journal of the Nature Publishing Group, describing the genetic editing of human leukocyte antigen (HLA) in hematopoietic stem cells as a means of broadening the human application of these and other cell therapies (Press release, Ziopharm, FEB 23, 2016, View Source [SID:1234509153]). The article, titled "Genetic editing of HLA expression in hematopoietic stem cells to broaden their human application", is available online first at View Source
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Laurence Cooper, M.D., Ph.D., Chief Executive Officer of ZIOPHARM and senior author of the journal article, noted: "Genetic editing of HLA expression is a step towards generating universal biological products, where one donor’s cells may become suitable for sustained engraftment in multiple unrelated recipients. Unlocking the method by which HLA repertoire can be modified is one key to achieving this goal and fully harnessing the potential for off-the-shelf (OTS) therapies in immuno-oncology applications. Together with our partners at Intrexon and MD Anderson, we are bringing to bear multiple technologies to advance the findings of these studies and achieve this objective, with the goal of deploying it across our T-cell and natural killer (NK)-cell therapy platforms."
Transplantation of allogeneic, or donor-derived, hematopoietic stem cells (HSCs) into recipients with hematologic disorders is used to restore bone marrow function, termed hematopoiesis. Finding a suitable donor can be challenging due to the need to match the constellation of HLA with the recipient. For the study, researchers at The University of Texas MD Anderson Cancer Center eliminated expression of one set of HLA molecules, termed HLA-A, on donor HSC using artificial zinc finger nucleases. Other HLA molecules, such as HLA B and C remained expressed to help prevent elimination by resident NK cells. Following genetic editing, the HSCs maintained their ability to engraft and reconstitute hematopoiesis. This paper reveals that genetically altered HSC harvested from a small pool of donors will then match with a large number of unrelated recipients, which has two implications. First, it broadens the number of recipients who might benefit from bone marrow transplantation, which has particular appeal for racial minorities underserved by the current genetic makeup of unrelated donors. Second, it paves the way for generating OTS cells that are HLA matched with multiple recipients, even though they were obtained from one donor.
ZIOPHARM is developing various cell-based immuno-oncology programs, including CAR-T, TCR and NK adoptive cell-based therapies, in collaboration with its partner Intrexon Corporation (NYSE:XON) and MD Anderson.