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Clinical Aspects of Ribozymes as Therapeutics in Gene Therapy

  • David Looney
  • Mang Yu
Part of the Methods in Molecular Biology™ book series (MIMB, volume 74)

Abstract

By June 1995, 112 gene therapy trials had been approved by the NIH Recombinant DNA Advisory Committee (RAC) in the US, involving 500 actual, planned, or projected patients (1, 2, 3). Marking trials comprise roughly 20% (25 in total) of all approved studies, while the remainder are considered to have therapeutic objectives. All together 87 treatment protocols are active, including 9 trials directed toward treatment of HIV infection, 21 that address genetic disorders, 1 each involving treatment of autoimmune or atherosclerotic disease, and 55 studies that target cancer therapy in some form (see Fig. 1). Therapeutic trials include 38 in vivo studies and 42 ex vivo studies, all together employing over 81 vectors (50 murine, 15 adenovirus, 1 AAV), as well as several other delivery systems (12 lipid mediated and 3 naked DNA delivery protocols). Treatment studies involving protein expression include replacement studies (e.g., ADA deficiency, cystic fibrosis, α-1-antitrypsin deficiency, Gaucher’s disease, familial hypercholesterolemia, and Hunter syndrome), and trials aimed to produce immunomodulation or immunoprophylaxis (including introduction of genetically engineered cytotoxic lymphocytes, vectors expressing viral proteins, and vectors expressing cytokines, such as GM-CSF, IL-2, IL-3, IL-6, IL-7, IL-12, and TNF, into malignant cells [1, 2, 3). Other trials involved introduction of toxin genes, particularly thymidine kinase (hsv-tk), into tumor tissue or protective genes (e.g., human multidrug resistance gene) into normal hematopoetic tissue to protect bone marrow during cytotoxic chemotherapy.
Fig 1.

Approved gene therapy trials in the US Data from the Office of Recombinant DNA Activities (ORDA) as published in Human Gene Therapy summaries in Gene Therapy Newsletter Issue 12, pp 1–2 (1995) was used to construct a cumulative graph indicating active approved protocols in the indicated areas. The group designated as “Other” includes protocols for autoimmune diseases and atherosclerotic vascular disease, and may not include protocols for which RAC approval was deferred with subsequent submission directly to the FDA.

Keywords

Gene Therapy Familial Hypercholesterolemia Hammerhead Ribozyme Gene Therapy Trial Hairpin Ribozyme 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Humana Press Inc. 1997

Authors and Affiliations

  • David Looney
    • 1
  • Mang Yu
    • 2
  1. 1.San Diego Veterans Administration Medical CenterSan Diego
  2. 2.ImmusolSan Diego

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