De novo nephrotic syndrome following pegylated interferon alfa 2b/ribavirin therapy for chronic hepatitis C infection

Interferon Induced Focal Segmental Glomerulosclerosis

Behçet's disease is an inflammatory disease of unknown etiology which involves recurring oral and genital aphthous ulcers and ocular lesions as well as articular, vascular, and nervous system involvement. Focal segmental glomerulosclerosis (FSGS) is usually seen in viral infections, immune deficiency syndrome, sickle cell anemia, and hyperfiltration and secondary to interferon therapy. Here, we present a case of FSGS identified with kidney biopsy in a patient who had been diagnosed with Behçet's disease and received interferon-alpha treatment for uveitis and presented with acute renal failure and nephrotic syndrome associated with interferon.

Renal impairment in patients with chronic hepatitis C treated with first generation protease inhibitors

BACKGROUND

The incidence, course and risk factors associated with renal impairment (RI) in patients treated with triple therapy (TT) with pegylated interferon, ribavirin and telaprevir/boceprevir (PR/TVR/BOC) vs. dual therapy (DT) with PR were analyzed in this study. The association between RI and the decline of hemoglobin (Hb) was also examined.

METHODS

Retrospective analysis included 110 patients with genotype 1b chronic HCV infection, aged 18 - 80 years, who underwent TT (48TVR/14BOC) or DT (48 patients). The estimated glomerular filtration rate (eGFR), serum creatinine concentration (SCr) and Hb were measured at baseline, at weeks 4, 12, 24, 48 of treatment, and post-treatment week 24.

RESULTS

RI occurred in 9/62 (14.5%) patients who underwent TT, eight of whom were treated with TVR, one with BOC, and none treated with DT. The risk factors associated with RI were the following: TT (p = 0.0078), usage of nephrotoxic drugs (p = 0.0288), and older age (p < 0.0001). RI was reversible. A drop of Hb was associated with RI, older age and TT.

CONCLUSIONS

RI is not a rare but a reversible complication of TT. It is necessary to monitor SCr and eGFR, especially in patients with a potential risk factor of RI occurrence. The Hb drop is more severe in patients with RI than in those without it.

Acute tubular necrosis following interferon-based therapy for hepatitis C: case study with literature review

BACKGROUND/AIMS

Interferon treatment of malignant or viral diseases can be accompanied by various side-effects including nephro-toxicity.

METHODS

We report on a 68-year-old Caucasian male who received dual therapy with pegylated interferon 2a plus ribavirin for chronic hepatitis C.

RESULTS

After three months of antiviral therapy, the patient developed acute kidney failure (serum creatinine up to 6 mg/dL) with mild proteinuria (500 mg daily) and haematuria. Immediate immunosuppressive therapy with high-dose intravenous steroids did not improve kidney function. Kidney biopsy was consistent with acute tubular necrosis without glomerular abnormalities. He started long-term peritoneal dialysis (four regular exchanges) to provide both dialysis adequacy and ascites removal. Kidney function gradually improved over the following months (serum creatinine around 2 mg/dL) and peritoneal dialysis was continued with two exchanges daily. The temporal relationship between the administration of the drug and the occurrence of nephro-toxicity, and the absence of other obvious reasons for acute tubular necrosis support a causative role for pegylated interferon; benefit on kidney disease was noted after withdrawal of antiviral agents. An extensive review of the literature on acute tubular necrosis associated with interferon-based therapy, based on in vitro data and earlier case-reports, has been made. The proposed pathogenic mechanisms are reviewed.

CONCLUSIONS

Our case emphasizes the importance of monitoring renal function during treatment of chronic hepatitis C with antiviral combination therapy as treatment may precipitate kidney damage at tubular level.

Treatment with IFN-{alpha}, -{beta}, or -{gamma} is associated with collapsing focal segmental glomerulosclerosis

BACKGROUND AND OBJECTIVES

Treatment with IFN is rarely associated with nephrotic syndrome and renal biopsy findings of minimal-change disease or FSGS.

DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS

We report 11 cases of collapsing FSGS that developed during treatment with IFN and improved after discontinuation of therapy.

RESULTS

The cohort consists of seven women and four men with a mean age of 48.2 yr. Ten of the 11 patients were black. Six patients were receiving IFN-alpha for hepatitis C virus infection (n = 5) or malignant melanoma (n = 1), three were receiving IFN-beta for multiple sclerosis, and two were treated with IFN-gamma for idiopathic pulmonary fibrosis. After a median and mean [corrected] duration of therapy of 4.0 and 12.6 months, respectively, patients presented with acute renal failure (mean creatinine 3.5 mg/dl) and nephrotic-range proteinuria (mean 24-hour urine protein 9.7 g). Renal biopsy revealed collapsing FSGS with extensive foot process effacement and many endothelial tubuloreticular inclusions. Follow-up was available for 10 patients, all of whom discontinued IFN. At a mean of 23.6 months, nine of 10 patients had improvement in renal function, including one with complete remission and two with partial remission. Among the seven patients with available data, mean proteinuria declined from 9.9 to 3.0 g/d. Four of the seven patients were treated with immunosuppression, and there was no detectable benefit.

CONCLUSIONS

Collapsing FSGS may occur after treatment with IFN-alpha, -beta, or -gamma and is typically accompanied by the ultrastructural finding of endothelial tubuloreticular inclusions. Optimal therapy includes discontinuation of IFN.

Efficacy and safety of pegylated IFN alfa 2b alone or in combination with ribavirin in thalassemia major with chronic hepatitis C

BACKGROUND

Treatment of HCV infection in patients with thalassemia major (TM) is limited by the lack of large clinical trials and concerns about ribavirin-induced hemolysis.

METHODS

We conducted a prospective, randomized, open-label study to determine efficacy and tolerability of pegylated-interferon alfa 2b (1.5 microg/kg/week) alone (group A) or with ribavirin (12-15 mg/kg/day; group B) in patients with TM and chronic HCV infection. Patients with genotype 1 or 4 HCV were treated for 48 weeks and those with genotype 3 or 2 HCV for 24 weeks. Early viral response (EVR; after 12 weeks of treatment), end-of-treatment virological response (ETR) and sustained virological response (SVR; 6 months after stopping therapy) were assessed.

RESULTS

Of 40 patients, 20 each were allocated to the two treatment groups. EVR rates in group A and B were 15 (75%) and 18 (90%), respectively. ETR occurred in 17/20 (85%) patients in each group. SVR occurred in 8 (40%) patients in group A and 14 (70%) in group B. Blood transfusion requirements increased in one patient in group A and four patients in group B. One patient in group A had severe sepsis and one in group B had nephrotic syndrome. Two patients in each group required reduction in drug dose.

CONCLUSIONS

In patients with TM and chronic HCV infection, pegylated interferon alfa 2b and ribavirin combination therapy achieves a higher SVR rate than pegylated interferon alone, and is well tolerated except for an increase in blood transfusion requirement.

Outcome of patients with primary hepatic venous obstruction treated with anticoagulants alone

BACKGROUND

Outcome of patients with hepatic venous outflow tract obstruction (HVOTO) has improved with newer treatments, including anticoagulants, radiological interventions and liver transplant. In India, however, liver transplant and radiological interventions are costly and have limited availability. Hence, patients often opt for anticoagulation alone. We followed up a group of such patients to determine the clinical outcome with such treatment.

METHODS

Consecutive patients with HVOTO, treated with oral anticoagulation and supportive medical therapy but no radiological or surgical intervention, were followed up for at least 12 months. Diagnosis of HVOTO was based on color Doppler, and either angiography or magnetic resonance venography. Warfarin dose was adjusted to maintain international normalized ratio (INR) between 2.0 and 3.0. Patients with secondary HVOTO and those with baseline INR > or = 2.0 were excluded. Response was defined as absence of ascites and/or encephalopathy, normal AST/ALT, bilirubin <1.5 mg/dL, and no portal hypertension related bleed after starting therapy.

RESULTS

Of 43 patients (mean [SD] age=28.7 [8.4] years; 20 men), 26 (61%) had a response during a median follow up of 23 (range 15-33) months. The response first appeared within 2 months of the start of treatment in 18 patients and between 2 and 5 months from the start of treatment in eight patients. Seven patients died of progressive liver failure (6 patients) or GI bleed (1 patient). Nine patients had anticoagulation-related complications. On univariate analysis, short duration of symptoms, high serum albumin, low baseline INR, and low baseline Child-Pugh's (CP) or Clichy scores predicted response. Presence of hepatic encephalopathy, portal vein thrombosis, obstruction of all hepatic veins, low albumin, high INR, high serum bilirubin, high baseline CP score, Murad score and adverse Clichy index were associated with higher mortality rate. However, on multivariate analysis, only low CP score was associated with response, and no factor was found to predict death.

CONCLUSIONS

More than half of patients with HVOTO show response with only supportive medical therapy and anticoagulants. This occurs more often in patients with low CP score. Some patients may have delayed response.

Collapsing glomerulopathy as a complication of interferon therapy for hepatitis C infection

We present the case of a patient with chronic hepatitis C and diabetes, who rapidly progressed to end stage renal disease upon initiation of IFNalpha therapy for his HCV infection. A kidney biopsy revealed advanced collapsing glomerulopathy.