Diagnostic evaluation of suspected Drug-Induced Liver Injury
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1 Diagnostic evaluation of suspected Drug-Induced Liver Injury Ynto de Boer, MD Department of Gastroenterology and Hepatology
2 Disclosure No disclosures
3 Drug-induced liver injury?
4 Outline What is DILI? What, other than the drug, causes DILI? How to diagnose DILI? Resources
5 Drug-induced liver injury Hepatotoxicity: Hepatocytes ALT/AST elevation Cholangiocytes Alk Phos elevation Direct toxicity, dose dependent (eg. Paracetamol; ~50% of DILI) Idiosyncratic injury
6 Drug-induced liver injury Ciprofloxacin - Acute hepatitic injury Isoniazid - chronic hepatitic injury Anabolic steroid - Acute cholestatic injury Amox-clav - Chronic cholestatic injury Duloxetine - Cholestatic hepatitis injury Kleiner et al. Hepatology 2014
7 Mechanisms Cell death: apoptosis and necrosis Reactive metabolite formation/bioactivation Drug transporter mediated drug-induced hepatotoxicity Immune-mediated response Mitochondrial dysfunction Activation of stress signaling pathways Shesu et al. Clin Liv Dis 2017
8 Mechanisms Shesu et al. Clin Liv Dis 2017
9 Genetics - Flucloxacillin HLA-B*57:01 Daly et al. Nat Genet 2009
10 Genetics overall 864 cases of DILI without amox/clav and fluclox Nicolleti et al. Gastroenerology 2016
11 Genetics Association Effect Size of rs , A*33:01, and rs Across Different Liver Injury Patterns Cohort Associated variant OR 95% CI P value AF cases AF controls Entire DILI cohort rs A*33: rs Cholestatic and mixed DILI cohort rs A*33: rs Hepatocellular DILI cohort rs A*33: rs Nicolleti et al. Gastroenerology 2016
12 Epidemiology Ahmad et al. Clin Liv Dis 2017
13 Idiosyncratic DILI National studies of drug-induced liver injury incidence Country Iceland France Korea United Kingdom Spain Sweden Years of study Study type Prospective Prospective Prospective Retrospective Retrospective Retrospective Number of DILI cases Crude DILI incidence rate/100,000 per year Ahmad et al. Clin Liv Dis 2017
14 Idiosyncratic DILI Drug-induced liver injury registries across the world Country United States Spain Korea Years of study Study type Prospective Prospective Prospective Number of DILI cases Antimicrobials (% of total) 45.3% 32% HDS (% of total) 16.1% 73% Ahmad et al. Clin Liv Dis 2017
15 Idiosyncratic DILI Prospective US DILIN study in 899 patients : Chalasani et al. Gastroenterology 2015
16 Idiosyncratic DILI Prospective US DILIN study in 899 patients : Therapeutic classes n Individual agents n 1 Antimicrobials Amoxicillin-clavulanate 91 2 Herbal and dietary supplements Isoniazid 48 3 Cardiovascular agents 88 3 Nitrofurantoin 42 4 Central nervous system agents 82 4 Sulfamethoxazole/trimethoprim 31 5 Anti-neoplastic agents 49 5 Minocycline 28 6 Analgesics 33 6 Cefazolin 20 7 Immunomodulatory 27 7 Azithromycin 18 8 Endocrine 20 8 Ciprofloxacin 16 9 Rheumatologic 13 9 Levofloxacin Gastrointestinal Diclofenac 12 Chalasani et al. Gastroenterology 2015
17 Clinical presentation Mild transaminase elevation Acute liver failure Bilirubinemia Up to 51% of transplantation for acute liver failure is due to DILI Ostapowicz et al. Ann Intern Med 2002
18 Augmentin Mild transaminase elevation Acute liver failure Bilirubinemia 64 year old man Up to 51% of transplantation for acute liver failure is due to DILI livertox.nih.gov
19 Minocycline Mild transaminase elevation Acute liver failure Bilirubinemia 64 year old man 55 year old woman Up to 51% of transplantation for acute liver failure is due to DILI livertox.nih.gov
20 Unexplained liver test abnormalities Ascertain the type of injury Exclusion of other etiologies: obstruction, (acute) viral hepatitis, (non-)alcoholic hepatitis, shock liver, autoimmune liver disease History of exposure to drugs, herbals and dietary supplements? Look for typical/distinguishing features: immunoallergic or autoimmune features
21 Hepatocellular vs cholestatic: the R-ratio Normalised ALT/ALP ratio: (ALT/ULN) (Alk Phos/ULN) >5: hepatocellular 2 5: mixed hepatic injury <2: cholestatic
22 Characteristics for causality assessment Time to onset/latency Course Risk factors Concomitant drugs Nondrug causes of liver injury Previous information on the hepatotoxicity of the drug Response to rechallenge Danan et al. Clin Epidemiol 1993
23 Risk factors Age: exposure, multiple drugs Gender: metabolism, exposure Alcohol Other liver disease Ethnicity/Genetics: Asian ethnicity HLA genotypes Danan et al. Clin Epidemiol 1993
24 Phenotypes Autoimmune (ANA, SMA, IgG): nitrofurantoin, minocycline, hydralazine, methyldopa Immunoallergic (rash, fever, eosinophilia): aromatic anticonvulsants, allopurinol, sulfonamides and fluoroquinolones Drug specific phenomena: icterus in anabolic steroids
25 Diagnostic scores: RUCAM Roussel-Uclaf Causality Assessment Method: The individual points range from -3 to +3 The total possible score ranges from -9 to or less excluded 1 to 2 unlikely 3 to 5 possible 6 to 8 probable >8, highly probable Danan et al. Clin Epidemiol 1993
26 Diagnostic scores: RUCAM Danan et al. Clin Epidemiol 1993
27 Liver biopsy Can be helpful, but is usually not necessary Exclusion of other etiologies Distinctive patterns can be recognised Kleiner et al. Hepatology 2014
28 Liver biopsy DILI and AIH Histologic features AIH DILI Severe portal inflammation ( grade 2) * Prominent intra-acinar lymphocytes *h Prominent intra-acinar eosinophils * Cholestasis canalicular *h, *c Prominent portal plasma cells * Rosette formation * Any levels of fibrosis ( grade 1) * Prominent port neutrophils *c Hepatocellular cholestasis *c Severer focal necrosis ( grade 4) * Suzuki et al. Hepatology 2011
29 Autoimmune features in DILI adslkf nitrofurantoin, minocycline, methyldopa and hydralazine De Boer et al. Clin Gastroenterol Hepatol 2017
30 Hy s Law Hyman Zimmerman: drug-induced hepatocellar jaundice is a serious lesion, with mortality from 10 to 50% Bob Temple: Hepatocellular-type injury (ALT > 3 upper limit of normal: ULN) Bilirubin >2x ULN, no evidence of obstruction (> Alk Phos) or Gilbert s syndrome Exclude other causes Temple Pharmacoepidemiol Drug Saf 2006
31 Outcome US DILIN outcome data Characteristics Antimicrobials Cardiovascular CNS agents Antineoplastics Analgesics (n = 408) (n = 88) (n = 82) (n = 49) (n = 33) Fatal, (%) Death, at any time (%) Liver transplantation (%) Chalasani et al. Gastroenterology 2015
32 Outcome Iceland Björnsson et al. Gastroenterology 2013
33 Herbal and dietary supplements The incidence of HDS-ILI is rising Ask, and ask again De Boer et al. Clin Liv Dis 2017
34 Herbal and dietary supplements De Boer et al. Clin Liv Dis 2017
35 Livertox adslkf livertox.nih.gov
36 Conclusion DILI can mimic any other liver disease and diagnosis is based on careful history and pattern of injury Liver biopsy may be helpful but generally not necessary HDS product are often not perceived as drugs or potentially dangerous: Ask and ask again A helpful resource: livertox.nih.gov
37 Thank you for your attention!
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