1. Carcinogenicity Assessment of Inotersen in Tg.rasH2 Mice and Sprague-Dawley Rats: Implications for 2'-MOE Antisense Oligonucleotides.
- Author
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Kim TW, Papagiannis CN, Zwick LS, Snyder P, Engelhardt JA, Yu RZ, Hoffmaster CM, Rastogi A, and Henry SP
- Abstract
Inotersen, a 2'-O-(2-methoxyethyl) modified antisense oligonucleotide (2'-MOE ASO), is approved for the treatment of hereditary transthyretin-mediated amyloidosis (hATTR). It underwent a comprehensive nonclinical safety evaluation, including safety pharmacology, repeat-dose toxicity, genotoxicity, reproductive and development toxicity, and carcinogenicity studies. Tumorigenic potential was assessed through dedicated carcinogenicity studies in transgenic rasH2 (Tg.rasH2) mice and Sprague Dawley (SD) rats. In the 26-week Tg.rasH2 mouse study, inotersen and a mouse-active surrogate (ISIS 401724) were administered as weekly subcutaneous (SC) doses up to 80 mg/kg and 30 mg/kg, respectively. Proinflammatory effects and ASO accumulation in the liver and kidney, both well-documented class effects, were observed; however, no treatment-related neoplasms were noted. Similarly, the mouse surrogate did not induce any treatment-related neoplasms. In the 2-year SD rat carcinogenicity study, inotersen was administered as weekly SC doses up to 6 mg/kg. The primary dose-limiting effect at doses ≥2 mg/kg/week was an increased incidence of chronic progressive nephropathy (CPN), which contributed to decreased survival at the 6 mg/kg/week dose level. Notably, no renal neoplasia was associated with the increased CPN. Increasing mononuclear cell infiltrates at the injection site were linked to an increased incidence of subcutaneous fibrosarcoma at doses ≥2 mg/kg/week. This inflammation-associated injection site tumor in rats administered inotersen has limited relevance for humans. Additionally, the long-term assessment of ASO effects in rats is somewhat limited due to the ASO exacerbation of CPN and its impact on survival. There was no evidence of genotoxicity in vitro or in vivo at limit doses. Collectively, these data support a conclusion that a single carcinogenicity assessment in the Tg.rasH2 mouse, along with data from chronic toxicology studies in the rodent and nonrodent, is sufficient to assess carcinogenic potential for this drug class., Competing Interests: Declaration of Competing Interest ☒ The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:Tae-Won Kim, Jeffery A. Engelhardt, Rosie Z. Yu, Christine M. Hoffmaster, Archit Rastogi and Scott P. Henry report reports a relationship with Ionis Pharmaceuticals Inc that includes: employment and equity or stocks. They also report that financial support, administrative support, article publishing charges, equipment, drugs, or supplies, and travel were provided by Ionis Pharmaceuticals Inc. Chris N. Papagiannis reports a relationship with Charles River Laboratories Inc Mattawan that includes: employment and equity or stocks. reports a relationship with Charles River Laboratories Inc Mattawan that includes: employment and equity or stocks. Paul Snyder reports a relationship with Experimental Pathology Laboratories, Inc. that includes: employment and equity or stocks. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024. Published by Elsevier Inc.)
- Published
- 2024
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