Abstract
Hyperbilirubinemia and pigment gallstones are frequent complications in transfusion-dependent β-thalassemia (TDβT) patients. Bilirubin production and clearance are determined by genetic as well as environmental variables like ineffective erythropoiesis, hemolysis, infection-induced hepatic injury, and drug- or iron-related toxicities. We studied the frequency of the Gilbert syndrome (GS), a common hereditary cause of hyperbilirubinemia in 102 TDβT patients aged 13–43 years (median 26 years). Total and unconjugated hyperbilirubinemia were frequent (81.4% and 84.3% patients respectively). Twenty (19.6%) patients showed total bilirubin > 3.0 mg/dL; 53 (51.9%) had an elevation of either alanine or aspartate aminotransferase, or alkaline phosphatase liver enzymes. Nineteen (18.6% of the 92 tested) were positive for hepatitis B or C, or HIV. The mean total and unconjugated bilirubin levels and AST, ALT, and ALP levels in patients positive for hepatitis B or C were not significantly different from negative cases. Eighteen patients (17.7%) had GS: homozygous (TA)7/7 UGT1A1 promoter motif (the *28/*28 genotype), 48 (47.1%) were heterozygous (TA)6/7. Total + unconjugated bilirubin rose significantly with the (TA)7 allele dose. Fourteen (13.7%) patients had gallstones. There was no significant difference in total/unconjugated bilirubin in patients with/without gallstones and no significant differences in frequencies of gallstones within the three UGT1A1 genotypes. This largest study in Indian TDβT patients suggests that GS should be excluded in TDβT cases where jaundice remains unexplained after treatable causes like infections, chelator toxicity, or transfusion-related hemolysis are excluded. GS was not associated with gallstones, possibly due to a lower incidence of cholelithiasis overall, a younger age cohort, or other environmental factors.
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Acknowledgments
The authors acknowledge the nursing and administrative staff of the Thalassemia Day Care Centre, Pediatric Hematology/Oncology Unit, Advanced Pediatric Centre and the Thalassemia/Hemoglobinopathy Pediatric-to-Adult Crossover Clinic, Adult Clinical Hematology Unit, Department of Internal Medicine, PGIMER, Chandigarh.
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Parts of this work were supported by the Medical Education and Research Cell, PGIMER, Chandigarh, and the Department of Biotechnology, Government of India (grant no. BT/PR26461/MED/12/821/2018).
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Prior presentation: As a poster at the 109th Annual Meeting of the United States and Canadian Academy of Pathologists (USCAP) at Los Angeles on March 3, 2020.
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Shrestha, O., Khadwal, A.R., Singhal, M. et al. A high frequency of Gilbert syndrome (UGT1A1*28/*28) and associated hyperbilirubinemia but not cholelithiasis in adolescent and adult north Indian patients with transfusion-dependent β-thalassemia. Ann Hematol 99, 2019–2026 (2020). https://doi.org/10.1007/s00277-020-04176-2
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DOI: https://doi.org/10.1007/s00277-020-04176-2