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1.
Arq. gastroenterol ; 49(1): 9-13, Jan.-Mar. 2012. tab
Article in English | LILACS | ID: lil-622555

ABSTRACT

CONTEXT: Abnormal serum ferritin levels are found in approximately 20%-30% of the patients with chronic hepatitis C and are associated with a lower response rate to interferon therapy. OBJECTIVE: To determine if the presence of HFE gene mutations had any effect on the sustained virological response rate to interferon based therapy in chronic hepatitis C patients with elevated serum ferritin. METHODS: A total of 44 treatment naÏve patients with histologically demonstrated chronic hepatitis C, all infected with hepatitis C virus genotype non-1 (38 genotype 3; 6 genotype 2) and serum ferritin above 500 ng/mL were treated with interferon (3 MU, 3 times a week) and ribavirin (1.000 mg, daily) for 24 weeks. RESULTS: Sustained virological response was defined as negative qualitative HCV-RNA more than 24 weeks after the end of treatment. Serum HCV-RNA was measured by qualitative in house polymerase chain reaction with a limit of detection of 200 IU/mL. HFE gene mutation was detected using restriction-enzyme digestion with RsaI (C282Y mutation analysis) and BclI (H63D mutation analysis) in 16 (37%) patients, all heterozygous (11 H63D, 2 C282Y and 3 both). Sustained virological response was achieved in 0 of 16 patients with HFE gene mutations and 11 (41%) of 27 patients without HFE gene mutations (P = 0.002; exact Fisher test). CONCLUSION: Heterozigozity for H63D and/or C282Y HFE gene mutation predicts absence of sustained virological response to combination treatment with interferon and ribavirin in patients with chronic hepatitis C, non-1 genotype and serum ferritin levels above 500 ng/mL.


CONTEXTO: Níveis séricos anormais de ferritina são encontrados em aproximadamente 20%-30% dos pacientes com hepatite crônica C e estão associadas a uma baixa taxa de resposta à terapia com interferon. OBJETIVO: Avaliar a associação entre a presença de mutações do gene HFE e a taxa de resposta virológica sustentada ao interferon em pacientes portadores de hepatite crônica C com ferritina sérica elevada. MÉTODOS: Um total de 44 pacientes, virgem de tratamento, infectado pelo vírus da hepatite C de genótipos não-1 (38 genótipo 3; 6 genótipo 2) e ferritina sérica acima de 500 ng/mL foi tratado com interferon (3 MU, três vezes por semana) e ribavirina (1000 mg/dia) por 24 semanas. Resposta virológica sustentada foi definida como HCV-RNA indetectável 24 semanas após o fim do tratamento. Foi utilizado técnica de reação em cadeia da polimerase em tempo-real com limite de detecção de 200 UI /mL. RESULTADOS: Mutações do gene HFE foram detectadas por "restriction-enzyme digestion" com RsaI (análise de mutação C282Y) e BclI (análise de mutação H63D) em 16 pacientes (37%), todos heterozigotos (11 H63D, 2 C282Y e 3 ambos). Resposta virológica sustentada foi alcançada em 0 de 16 pacientes com mutações do gene HFE e 11 (41%) dos 27 pacientes sem mutações do gene HFE (P = 0,002; teste exato de Fisher). CONCLUSÃO: A heterozigose para os genes H63D e/ou C282Y HFE está associada à redução significativa da taxa de resposta virológica sustentada ao tratamento com interferon e ribavirina em pacientes com hepatite crônica C, genótipo não-1 e com níveis séricos de ferritina acima de 500 ng/mL.


Subject(s)
Adult , Female , Humans , Male , Antiviral Agents/therapeutic use , Ferritins/blood , Hepatitis C, Chronic/blood , Histocompatibility Antigens Class I/genetics , Interferons/therapeutic use , Membrane Proteins/genetics , Ribavirin/therapeutic use , Cohort Studies , Cross-Sectional Studies , Drug Therapy, Combination , Genotype , Hepacivirus/genetics , Hepatitis C, Chronic/drug therapy , Mutation/genetics , Polymorphism, Genetic/genetics , Real-Time Polymerase Chain Reaction , RNA, Viral/blood
2.
Braz. j. infect. dis ; 14(5): 457-461, Sept.-Oct. 2010. ilus, tab
Article in English | LILACS | ID: lil-570559

ABSTRACT

BACKGROUND AND OBJECTIVES: Evidence suggests that sustained virologic response to interferon treatment decreases incidence of hepatocellular carcinoma in patients with hepatitis C virus cirrhosis. This study was designed to compare the incidence of hepatocellular carcinoma among cirrhotic patients exposed to interferon based treatment with or without achieving a sustained virological response, in order to evaluate the role of interferon itself in the prevention hepatocellular carcinoma. METHODS: A cohort of 85 patients with compensated hepatitis C cirrhosis was followed after treatment with interferon and ribavirin. Sustained virological response was defined as negative polymerase chain reaction assay 24 weeks after the end of treatment. Patients were followed every 6 months with ultrasound and alpha-fetoprotein. Hepatocellular carcinoma was diagnosed by the finding of a focal liver lesion greater than 2 cm with arterial hypervascularization on two imaging techniques and/or by liver biopsy. RESULTS: The mean follow-up time was 32.1 ± 20 months for patients who achieved a sustained virological response and 28.2 ± 18 months among 47 patients (55 percent) without SVR. Hepatocellular carcinoma was diagnosed in 1 (3 percent) vs. 8 (17 percent) responders and non responders respectively (p = 0.02). CONCLUSION: Patients with cirrhosis due to hepatitis C virus who achieved sustained virological response had significantly lower incidence of hepatocellular carcinoma when compared to those without treatment response. Interferon treatment without achieving sustained virological response does not seem to protect against hepatocellular carcinoma.


Subject(s)
Adult , Aged , Female , Humans , Male , Middle Aged , Antiviral Agents/therapeutic use , Carcinoma, Hepatocellular/prevention & control , Hepatitis C, Chronic/drug therapy , Interferons/therapeutic use , Liver Cirrhosis/complications , Liver Neoplasms/prevention & control , Ribavirin/therapeutic use , Anticarcinogenic Agents/therapeutic use , Brazil , Cohort Studies , Carcinoma, Hepatocellular/virology , Drug Therapy, Combination/methods , Hepatitis C, Chronic/complications , Incidence , Liver Cirrhosis/virology , Liver Neoplasms/virology , RNA, Viral/blood
3.
Article in Portuguese | LILACS | ID: lil-245552

ABSTRACT

O trabalho teve por objetivo avaliar a taxa de resposta completa ao final do tratamento e de resposta sustentada em pacientes com cirrose pelo vírus da hepatite C tratados com interferon isolado ou combinado com ribavirina. Um total de 33 pacientes cirróticos ambulatoriais, VHC positivos, sem outras causas identificáveis de doença hepática, compensados e classificados como Child-Pugh A, foram divididos em dois grupos, de forma não randomizada...


Subject(s)
Humans , Liver Cirrhosis/drug therapy , Drug Evaluation , Interferons/therapeutic use , Longitudinal Studies , Ribavirin/therapeutic use
4.
Rev. AMRIGS ; 42(2): 68-71, abr.-jun. 1998. tab
Article in Portuguese | LILACS | ID: lil-238313

ABSTRACT

O vírus da hepatite C pode cursar com manifestações extra-hepáticas relacionadas a distúrbio imunológico. Este trabalho objetivou verificar a prevalência de Diabetes mellitus em pacientes com hepatite crônica C. Entre novembro de 1992 e dezembro de 1997 foram avaliados prospectivamente 140 pacientes ambulatoriais e consecutivos, com anti-VHC (ELISA-2) e PCR positivos...


Subject(s)
Humans , Diabetes Mellitus/etiology , Hepatitis C, Chronic/complications , Prospective Studies
5.
Rev. AMRIGS ; 41(3): 141-51, jul.-set. 1997. ilus
Article in Portuguese | LILACS | ID: lil-221703

ABSTRACT

Os autores realizam uma revisäo sobre os principais aspectos farmacodinâmicos e farmacocinéticos dos interferons humanos. Atualmente classificados no grupo das citocinas, estes agentes säo secretados por diversas células do organismo em resposta à infecçäo viral e a diversos outros estímulos, sendo divididos em alfa, beta e gama...


Subject(s)
Humans , Interferons/pharmacokinetics , Antineoplastic Agents , Antiviral Agents
6.
GED gastroenterol. endosc. dig ; 15(5): 179-82, set.-out. 1996.
Article in Portuguese | LILACS | ID: lil-182581

ABSTRACT

Colangite esclerosante primária (CEP) é doença de etiologia desconhecida caracterizada por inflamaçao e fibrose envolvendo a árvore biliar intra e/ou extra-hepática, levando à dilataçao e estenose dos ductos biliares. Estudos recentes têm demonstrado importante papel dos falores imunológicos e genético na patogênese desta condiçao. A anemia hemolítica auto-imune (AHA) caraacteriza-se por anticorpos antieritrocitários que parecem surgir como resultado de distúrbio funcional específico do linfócito T supressor. A oportunidade que tivemos de diagnosticar e tratar dois pacientes com CEP associada à AHA motiva o presente estudo. De nosso conhecimento, existem apenas dois relatos prévios desta associaçao publicados na literatura.


Subject(s)
Humans , Male , Middle Aged , Anemia, Hemolytic, Autoimmune/complications , Cholangitis, Sclerosing/complications , Anemia, Hemolytic, Autoimmune/diagnosis , Cholangitis, Sclerosing/diagnosis , Coombs Test
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