Cited by 616Drug-Induced Hepatotoxicity and ProtectionHepatitis B Virus StudiesHepatitis C virus research

Hepatic failure and lactic acidosis due to fialuridine (FIAU), an investigational nucleoside analogue for chronic hepatitis B

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McKenzie, Robin, Fried, Michael W., Sallie, Richard, Conjeevaram, Hari, Di Bisceglie, Adrian M., Park, Yoon, Savarese, Barbara, Kleiner, David +6 more·1995·New England Journal of Medicine

Abstract

BACKGROUND: We describe severe and unexpected multisystem toxicity that occurred during a study of the antiviral nucleoside analogue fialuridine (1-(2-deoxy-2-fluoro-beta-D-arabinofuranosyl)-5-iodouracil, or FIAU) as therapy for chronic hepatitis B virus infection. METHODS: Fifteen patients with chronic hepatitis B were randomly assigned to receive fialuridine at a dose of either 0.10 or 0.25 mg per kilogram of body weight per day for 24 weeks and were monitored every 1 to 2 weeks by means of a physical examination, blood tests, and testing for hepatitis B virus markers. RESULTS: During the 13th week lactic acidosis and liver failure suddenly developed in one patient. The study was terminated on an emergency basis, and all treatment with fialuridine was discontinued. Seven patients were found to have severe hepatotoxicity, with progressive lactic acidosis, worsening jaundice, and deteriorating hepatic synthetic function despite the discontinuation of fialuridine. Three other patients had mild hepatotoxicity. Several patients also had pancreatitis, neuropathy, or myopathy. Of the seven patients with severe hepatotoxicity, five died and two survived after liver transplantation. Histologic analysis of liver tissue revealed marked accumulation of microvesicular and macrovesicular fat, with minimal necrosis of hepatocytes or architectural changes. Electron microscopy showed abnormal mitochondria and the accumulation of fat in hepatocytes. CONCLUSIONS: In patients with chronic hepatitis B, treatment with fialuridine induced a severe toxic reaction characterized by hepatic failure, lactic acidosis, pancreatitis, neuropathy, and myopathy. This toxic reaction was probably caused by widespread mitochondrial damage and may occur infrequently with other nucleoside analogues.

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Crossref · 10.1056/nejm199510263331702

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  • Fialuridine and troglitazone are intrinsic toxicodynamic failures, driven by human-relevant mitochondrial injury and reactive-metabolite formation, respectively.

    “Fialuridine (Section 7.1) and troglitazone (Section 7.4) are intrinsic toxicodynamic failures, driven by human-relevant mitochondrial injury and reactive-metabolite formation, respectively.”

    From Beyond Body Weight: A Comprehensive Review of Allometric Scaling in Drug Development for Human Dose Predictions (2026) · cites this paper as [69]

    The Discussion (p. 1099) links fialuridine toxicity in patients to widespread mitochondrial injury, but presents the mechanism as a hypothesis rather than an established cause. The paper does not address troglitazone or reactive-metabolite formation, and it does not use the classification “intrinsic toxicodynamic failures.” (LLM, conf=0.87)

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  • Fialuridine caused catastrophic hepatic failure and lactic acidosis in a 1993 clinical trial, resulting in five deaths and two liver transplantations.

    “Fialuridine, an antiviral nucleoside analogue, caused catastrophic hepatic failure and lactic acidosis in a 1993 clinical trial, resulting in five deaths and two liver transplantations.”

    From Beyond Body Weight: A Comprehensive Review of Allometric Scaling in Drug Development for Human Dose Predictions (2026) · cites this paper as [69]

    Characteristics of the Patients places the trial in 1993, and the Discussion reports fialuridine-induced hepatic failure and lactic acidosis with five deaths. But Histologic Evidence of Fialuridine-Induced Hepatotoxicity says five patients underwent transplantation, not two; two survived after transplantation. (LLM, conf=0.91)

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  • Preclinical studies across multiple species showed no indication of the severe mitochondrial toxicity observed in humans, because fialuridine incorporation into mitochondrial DNA is mediated by a human-specific mitochondrial transporter.

    “Preclinical studies across multiple species showed no indication of the severe mitochondrial toxicity observed in humans, because fialuridine’s incorporation into mitochondrial DNA is mediated by a human-specific mitochondrial transporter [69,70].”

    From Beyond Body Weight: A Comprehensive Review of Allometric Scaling in Drug Development for Human Dose Predictions (2026) · cites this paper as [69]

    The Discussion (indexed under p. 1099) says preclinical studies in laboratory animals did not predict the severe toxicity seen in patients and links the human syndrome to possible mitochondrial injury. It does not say that a human-specific mitochondrial transporter mediates fialuridine’s incorporation into mitochondrial DNA or explains the animal–human difference; it instead discusses fialuridine’s chemical structure as a possible factor. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Idiosyncratic toxicities are by definition not captured by any pharmacokinetic scaling framework.

    “Fourth, idiosyncratic toxicities, such as those underlying the fialuridine and troglitazone failures, are by definition not captured by any pharmacokinetic scaling framework, and even sophisticated PBPK or PBPK–PD models cannot reliably anticipate them without orthogonal mechanistic assays [69,70,75,76].”

    From Beyond Body Weight: A Comprehensive Review of Allometric Scaling in Drug Development for Human Dose Predictions (2026) · cites this paper as [69]

    The Discussion (page not available in our copy) reports severe fialuridine toxicity that preclinical animal studies had not predicted, supporting fialuridine as an example of an unexpected toxicity. It does not say that this toxicity was idiosyncratic by definition or establish that pharmacokinetic scaling or PBPK models cannot anticipate such toxicities. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Even sophisticated PBPK or PBPK-PD models cannot reliably anticipate idiosyncratic toxicities without orthogonal mechanistic assays.

    “even sophisticated PBPK or PBPK–PD models cannot reliably anticipate them without orthogonal mechanistic assays [69,70,75,76]”

    From Beyond Body Weight: A Comprehensive Review of Allometric Scaling in Drug Development for Human Dose Predictions (2026) · cites this paper as [69]

    The Discussion reports that preclinical animal studies did not predict the severe fialuridine toxicity later seen in patients. It does not evaluate PBPK or PBPK–PD models or say that orthogonal mechanistic assays are necessary, so it supports only the broader point that this toxicity went unanticipated. (LLM, conf=0.83)

    Experimental — accuracy not yet measured

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Cites

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Research works printed but not linked: 5

  1. Dusheiko G, Hoofnagle JH. Hepatitis B. In: McIntyre N, Benhamou JP, Bircher J, Rizzetto M, Rodes J, eds. Oxford textbook of clinical hepatology. New York: Oxford University Press, 1991:571-92.
  2. Paar DP, Hooten TM, Smiles KA, et al. The effect of FIAU on chronic hepatitis B virus (HBV) infection in HIV-infected subjects (ACTG 122b). In: Program and abstracts of the 32nd Interscience Conference on Anti- microbial Agents and Chemotherapy, Anaheim, Calif., October 10-14, 1992.
  3. Fried MW, Di Bisceglie AM, Straus SE, Savarese B, Beames MP, Hoofna- gle JH. FIAU, a new oral anti-viral agent, profoundly inhibits HBV DNA in patients with chronic hepatitis B. Hepatology 1992;16:127A. abstract.
  4. Seiter K, Kemeny N, Martin DS, et al. Uridine allows dose escalation of 5-fluorouracil when given with N-phosphonacetyl-L-aspartate, methotrex- ate, and leucovorin. Cancer 1993;71:1875-81.
  5. Stevenson W, Gaffey M, Ishitani M, et al. Clinical course of four patients receiving the experimental antiviral agent fialuridine for the treatment of chronic hepatitis B infection. Transplant Proc 1995;27:1219-21.

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Authors
McKenzie, R., Fried, M. W., Sallie, R., Conjeevaram, H., Di Bisceglie, A. M., Park, Y., Savarese, B., Kleiner, D., Tsokos, M., Luciano, C., Pruett, T., Stotka, J. L., Straus, S. E., & Hoofnagle, J. H.
Affiliations
  • National Institutes of Health (US)
  • National Institute of Diabetes and Digestive and Kidney Diseases (US)
  • National Institute of Allergy and Infectious Diseases (US)
  • National Cancer Institute (UA)
  • University of Virginia Hospital (US)
  • Eli Lilly (United States) (US)
Venue
New England Journal of Medicine
Published
1995-10-26
Volume
333
Issue
17
Pages
1099-1105
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W2327070670
Cited by
616
References
39
Citations by year
2026: 14 · 2025: 11 · 2024: 17 · 2023: 13 · 2022: 11 · 2021: 19 · 2020: 13 · 2019: 26 · 2018: 32 · 2017: 23 · 2016: 27 · 2015: 16 · 2014: 12 · 2013: 16 · 2012: 10
FWCI
28.57
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • NIH Clinical Center
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
  • Health Sciences › Medicine › Epidemiology › Hepatitis B Virus Studies
  • Health Sciences › Medicine › Hepatology › Hepatitis C virus research
Keywords
FIAU, lactic acidosis, liver failure, hepatotoxicity, chronic hepatitis B, nucleoside analogues, drug toxicity, mitochondrial damage, pancreatitis, neuropathy, myopathy, liver transplantation, drug-induced liver injury
MeSH terms
Acidosis, Lactic, Adult, Alanine Transaminase, Antiviral Agents, Arabinofuranosyluracil, Chronic Disease, DNA, Mitochondrial, DNA, Viral, Female, Hepatitis B, Humans, Jaundice, Liver, Male, Middle Aged, Pancreatitis, Peripheral Nervous System Diseases, Drugs, Investigational, Liver Transplantation, Liver Failure

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