Renal impairment is common in patients with chronic hepatitis B infection. For those taking nucleotide analogues, renal toxicity of adefovir disoproxil (ADV) and tenofovir disoproxil fumarate (TDF) is a significant concern in chronic hepatitis B (CHB) patients. Early observational clinical data suggested that telbivudine (LdT) might have renoprotective effects. In this prospective study, consecutive CHB patients on combined lamivudine (LAM)+ADV/TDF are switched to LdT+ADV/TDF at recruitment and are followed up for 24 months. Estimated glomerular filtration rate (eGFR) is calculated with the Modification of Diet in Renal Disease (MDRD) equation. The effects of LdT on cell viability and expression of kidney injury or apoptotic biomarkers are investigated in cultured renal tubular epithelial cell line HK-2.
Background Both CHB and chronic kidney disease are major health issue affecting millions of persons worldwide. Based on a large European multicenter database, the Virgil-database, it is estimated that 15% and 4% of the CHB patients in Europe had mild (GFR 50-80ml/min) and moderate (GFR \<50ml/min) renal impairment respectively . These group of patients require special attention as the nucleos(t)ides agents (NA) used in the treatment of CHB are cleared by kidneys and may worsen the kidney function. Recently, a subgroup analysis of the GLOBE study and 4 small prospective studies provide circumstantial evidence on the use of telbivudine (LDT) that can improve renal function in CHB patients. However, there are no prospective, controlled trials to date to evaluate the relationship between LDT and renal function. Research plan and methodology This is a prospective study in CHB patients treated with NA and pre-existing mild to moderate renal impairment defined as estimated GFR (eGFR) 30-90ml/min. Aims To compare the renal function of patients before and after switching lamivudine to telbivudine. To determine any adverse events from switching other NA to telbivudine To determine any biochemical and virological change from switching other NA to telbivudine by checking ALT, HBV DNA at baseline, and at weeks 12, 24, 36, 48, 60, 72, 84, 96 and 108 weeks To determine any change in 24 hour urinary protein and urinary glucose level To determine the in vitro effects of telbivudine on renal tubular cells
Study Type
INTERVENTIONAL
Purpose
TREATMENT
Masking
NONE
Enrollment
31
CHB patients who are receiving adefovir or tenofovir disoproxil fumarate are recruited. At the time of recruitment (0 month, baseline), lamivudine is switched to telbivudine while adefovir or tenofovir disoproxil fumarate was continued. The patients are followed-up for 24 months.
Department of Medicine, The University of Hong Kong, Queen Mary Hospital
Hong Kong, Hong Kong
Renal function change
Describe the change in renal function after 108 weeks of telbivudine switch
Time frame: 108 weeks
Virologic suppression
Rate of virologic suppression
Time frame: 108 weeks
Adverse events
Rate of adverse events
Time frame: 108 weeks
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