Search results for "Hepatitis B viru"
showing 10 items of 296 documents
Impact of HBV, HCV and GBV-C/HGV on hepatocellular carcinomas in Europe: results of a European concerted action.
1998
Abstract Background/Aims: To investigate the impact of hepatitis B (HBV) and C (HCV) infections on hepatocellular carcinoma (HCC) in Europe. Methods: Five hundred and three patients with HCC, from six liver centers, were included. All 503 sera and 80 liver samples were tested for HBV DNA and HCV RNA by polymerase chain reaction. GBV-C/HGV RNA was also tested in 57 sera. Results: HBsAg and anti-HCV were detected in 19% and 40.1% of the patients, respectively. Serum and liver HBV DNA were detected in 82% and 91% of the HBsAg positive subjects. HBV DNA was also detected in the serum and liver of 33% and 47% of HBsAg negative patients. In this group, serum HBV DNA was more prevalent in anti-HBs…
Evaluating the risk of hepatitis B reactivation in patients with haematological malignancies: is the serum hepatitis B virus profile reliable?
2009
Background/Aim: Patients with an occult hepatitis B virus (HBV) infection undergoing deep immunosuppression are potentially at risk of HBV reactivation. In order to assess whether a polymerase chain reaction (PCR) assay for HBV DNA in serum could be used to predict the reactivation of an occult HBV infection, we performed a retrospective study in a cohort of Sicilian patients with oncohaematological diseases. Methods: We studied by a highly sensitive ad hoc nested PCR for serum HBV DNA 75 HBsAg-negative oncohaematological patients requiring chemotherapy. Results: Thirty-three patients (44%) were HBV seronegative (anti-HBc and anti-HBs negative) and 42 patients (56%) were HBV seropositive (a…
Detection of hepatitis B virus markers in sera of asymptomatic hepatitis B surface antigen carriers with special emphasis to pre-S-encoded proteins.
1987
Sera of asymptomatic hepatitis B surface antigen (HBsAg) carriers were analyzed for the presence of pre-S-encoded proteins. Four individuals with biopsy-proven chronic hepatitis uniformly expressed pre-S1- and pre-S2-encoded proteins. Individuals who had histologically normal or largely normal livers were heterogeneous with respect to expression of pre-S-encoded proteins. This heterogeneous expression of pre-S-encoded proteins occurred most likely due to difference in serum HBsAg concentration. Alternatively differences in pre-S gene expression need to be considered. Clinically the study indicates that expression of pre-S domains in serum is unrelated to viremia or chronic liver disease.
Modification of Hepatitis B Virus Infection by Recombinant Leukocyte Alpha A Interferon
1986
A defect in alpha interferon production in patients with chronic type B hepatitis offers a rationale principle for treating this disease with interferon. Two trials with interferon in chronic type B hepatitis indicate that this therapy achieves an elimination of HBsAg and HBeAg significantly higher than spontaneous. Our study and that of others indicate, however, that the response to interferon therapy is dependent on many variables including: the type of interferon, the interferon dose, duration of interferon treatment, sex, sexual preference in men and coinfection with other viruses. As of the multiple modes of action of interferon, a better understanding of viral replication, of the anti…
Hepatitis B virus and delta infection in male homosexuals
2008
— Six hundred and sixty-six homosexuals were analysed in respect of hepatitis B virus and delta infections. Evidence of ongoing or recent hepatitis B virus infection was found in 450/666 (67.6%) homosexuals; 44 were HBsAg positive. Anti-delta was found in two HBsAg-positive homosexuals. Both individuals had a non-replicative form of HBV infection and biochemical evidence of liver disease. The study confirms that HBV infection is frequent in homosexuals and indicates that delta-infection is rare in male homosexuals.
Functional analysis of a rare HBV deletion mutant in chronically infected children.
2003
Liver damage caused by chronic hepatitis B virus (HBV) infection may be enhanced through the selection of deleted HBV preS mutants by intracellular accumulation of viral proteins and subsequent cell death. However, the prevalence and impact of such mutants on the clinical course of infection have not yet been studied in children. Serum samples from 60 children (mean age 9.8 y) were investigated by means of PCR and direct sequencing of the entire preS region. Only one patient (1.5%) was found with a mixed HBV population of a deletion spanning 183 nucleotides and wild-type sequences. This mutation alters the HBV large-surface protein and removes the small-surface promoter. To clarify the sign…
Hepatitis B Virus DNA in Liver Tissue of Chronic HBsAg Carriers in Childhood and Its Relationship to Other Viral Markers
1992
The aim of the study was to examine the state of hepatitis B virus (HBV) DNA in liver tissue of 103 children with chronic hepatitis B aged 0.5-18 years to detect free and integrated viral sequences by Southern blot hybridization. HBV DNA was found in 74 patients. Seventy-two were seropositive for hepatitis B e antigen (HBeAg) and two had anti-HBe antibodies. Integrated sequences could be demonstrated in two children. One of them had only integrated HBV DNA and was anti-HBe seropositive. The other one presented both free and integrated viral sequences and developed seroconversion from HBeAg to anti-HBe 5 months after biopsy. In 29 hepatitis B surface antigen (HBsAg) carriers, no HBV DNA coul…
Sustained elimination of hepatitis B virus from serum induced in a patient with chronic hepatitis B and advanced human immunodeficiency virus infecti…
1994
A 48-year-old male patient was admitted with acquired immunodeficiency syndrome (stage III, Centers for Disease Control 1993) and viremic hepatitis B. Blood CD4 count was 15/microliters. Discontinuation of prednisolone, previously prescribed by the patient's family practitioner because of elevated liver enzymes, resulted in severe hepatitis (alanine aminotransferase > 300U/l). Administration of interferon-alpha (9 x 10(6) U s.c. 3 x weekly) was initiated. Serum markers of viral replication disappeared, and aminotransferase levels returned to normal within a few weeks. The patient's serum was found negative for HBsAg after 3 months. Immunohistochemical analysis of liver biopsies before and d…
Detection of different viral strains of hepatitis B virus in chronically infected children after seroconversion from HBsAg to anti-HBs indicating vir…
1998
Abstract Background/Aims: Seroconversion to anti-HBs or the loss of HBsAg is usually associated with complete elimination of the replicative hepatitis B virus. Usually in these patients hepatitis B virus DNA (HBV DNA) becomes undetectable. Routine controls of patients who underwent anti-HBs seroconversion by more sensitive tests showed that in some cases the virus persisted in the patient. Therefore the aim of our study was to evaluate if virus persistence could also be found in children with chronic hepatitis B after anti-HBs seroconversion. The virus pool should be characterized before and after seroconversion. Methods: Viral DNA was extracted from nine HBsAg negative or anti-HBs positive…
One‐quarter of chronic hepatitis D patients reach HDV‐RNA decline or undetectability during the natural course of the disease
2021
BACKGROUND Spontaneous HDV-RNA fluctuations, assessed by nonstandardised in-house assays, have been reported during the course of chronic hepatitis delta (CHD). AIMS To evaluate changes in serum HDV-RNA concentrations in untreated CHD patients and correlate these changes with other HBV markers. METHODS A total of 323 consecutive serum samples from 56 CHD patients (detectable HDV-RNA) followed for >3 years were retested for HDV-RNA levels by a sensitive technique using the first WHO international HDV-RNA standard. Quantitative HBsAg, HBV-DNA, and HBV-RNA were also determined. RESULTS Most participants were male, middle-aged, white European, and HBeAg-negative (82%). Almost half had liver cir…