Navegando por Assunto "Carcinoma hepatocelular"

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Análise da expressão de miRNAs em carcinoma hepatocelular
(Universidade Federal do Pará, 2014-02-11) SANTOS, Ian Barroso dos; DEMACHKI, Samia; SANTOS, Ney Pereira Carneiro dos; http://lattes.cnpq.br/7568391537270652; http://lattes.cnpq.br/1290427033107137
Hepatocellular carcinoma represents the most common primary malignancy of the liver and the fifth most common solid tumor worldwide. Highly lethal, remais a serious public health problem because of difficulties in early diagnosis and the development of effective therapeutic measures. Recent in the field of molecular biology studies suggest that define the profile of miRNAs in hepatocellular carcinoma may considerably influence the identification of risk factors associated with oncogenes and suppressor genes. The objective is to evaluate the expression of miRNA 135b, miRNA 181a-5p and miRNA 181a-3p in samples of Hepatocellular Carcinoma and Chronic Hepatitis C and correlate them so likely to seek biomarkers related to the mechanism of carcinogenesis. The research was done in six patients with hepatocellular carcinoma and twenty four cases of Chronic Hepatitis C, Para, northen Brazil. All samples Hepatocellular carcinoma underwent microdissection for subsequent RNA extraction. For the extraction of total RNA and microRNA All=Prep the DNA / RNA FFPE kit (quiagem), quantified by the Qubit® 2.0 Fluorometer (Invitrogen) for final concentration of 5ng/μL standard equipment was used. The cDNA was obtained using TaqMan® MicroRNA Reverse Transcription (Applied Biosystems). Statistical analyzes were performed in softwares SPSS 17.0, using the Mann-Whitney test, with significat differences in the expression levels of the miR181a-3p and miR 181a-5p in hepatocellular carcinoma (average 3.94 and 17.9, respectively) compared with chronic hepatitis C (average 1.18 to 1.8, respectively) with P-value of 0.005 and 0.003. In this study, it was observed that miRNAs 181a-3p and 181a-5p, especially the 181a-5p way were significantly more highly expressed in hepatocellular carcinoma samples when compared to non-tumor liver tissue with chronic hepatitis C. Therefore, microRNAs have interesting characteristics that favor them as possible in biological screening for early diagnosis of tumors and targeted therapies selected markers.
Acesso aberto (Open Access)
Análise de componentes principais de variáveis nutricionais e de polimorfismos nos genes MDM2, XRCC1 E MTHFR como fatores de risco para Carcinoma Hepatocelular em pacientes com Hepatite C Crônica
(Universidade Federal do Pará, 2016-03-16) PINHO, Priscila Matos de; DEMACHKI, Samia; http://lattes.cnpq.br/7568391537270652; ARAÚJO, Marília de Souza; http://lattes.cnpq.br/9371703949781020
Introduction: Liver diseases are among the leading causes of morbidity and mortality in the world. Hepatitis C is present in approximately 20% of cases of acute hepatitis and 70% of cases of chronic hepatitis. E has been associated with the presence of accumulation of intrahepatic lipids (fatty liver) and it often progresses to development of liver cirrhosis and hepatocellular carcinoma (HCC) is the leading cause of liver transplantation. Objective: To evaluate the relationship of nutritional variables and polymorphisms of MDM2 gene, MTHFR and XRCC1 with risk to HCC in patients with chronic hepatitis C. Methods: case - control performed with patients with chronic hepatitis C. Cases were patients with chronic HCV infection, those with positive anti-HCV and HCV-RNA for six months or more since the detection of the infection within the clinical presentation parameters. They considered participants in the control group healthy subjects aged> 20 years, of both sexes. They were invited to participate in the voluntary survey. We used a nutritional assessment questionnaire. The presence of MDM2 polymorphisms (rs3730485) was investigated; XRCC1 (rs3213239) and MTHFR (rs1801133). It used the Fisher's exact test, odds ratio, and analysis of Principal Components. Results: For genotyping, it was found similarity in frequency of polymorphisms of MTHFR genes XRCC1 and MDM2 in both groups. The odds ratios that had significant p values were low fruit intake, physical inactivity and BMI> 25 kg / m². The results of principal component analysis are indicative that there are at least three pathophysiologic processes that operate in the cluster of risk factors for HCC, and are strongly related to body fat, alcohol consumption and low consumption of fruits. Conclusion: The patients evaluated aggregate risk factors for the development of HCC.
Acesso aberto (Open Access)
Carcinoma hepatocelular e as infecções pelos vírus das hepatites B e C na Amazônia Oriental: estudo clínico-sorológico e de biologia molecular
(Universidade Federal do Pará, 1999-08-06) MIRANDA, Esther Castello Branco Mello; BENSABATH, Gilberta; http://lattes.cnpq.br/0818254462635138; CRUZ, Ermelinda do Rosário Moutinho da; http://lattes.cnpq.br/6061358867607317
In order to contribute to a better understanding of the possible role of hepatitis B and C in the etiopathogenis of hepatocellular carcínoma (HCC) in the East Amazon, there were studied 36 patients admited in three public hospitais in Belém/PA, from January,1992 to March,1999. The criteria to be enrolled in the study were the association of clinical and image procedures, alpha-fetoprotein (AFP) above 400nglml in the serum and/or histopathology examination compatible to hepatocellular carcinoma. Clinical aspects, biochemical and histological examination, serum levei of AFP and serological B and C hepatitis markers were evaluated. Polymerase chain reaction assays were used to detect serum virus nucleic acids, HBV DNA and HCV RNA. There was a predominance for male sex in the prevalence of HCC (p<0.01 ) in a ratio of 6.2 to 1 (male/female). Regarding age, the Mean and the Median were 50.8 and 53.0 years respectively, and the Amptitude was 6 to 81 years. Most patients (52.7%) carne from rural regions. Farmer was the main occupation referred (p<0.01). Alcohol abuse was observed in 33.3%. Abdominal pain and hepatomegaly were the most recorded sign and symptoms in 94.4% of patients. Cirrhosis was detected in 83.3%. The majority of it belonged to class B or class C of Child-Pugh classification. During diagnosis, 50% of patients had some kind of complication, specially portal-systemic encephalopathy and gastro-intestinal hemorrhage (upper digestive bleeding) related to the originai chronic liver disease. In 88,9% of the sample, one or more hepatitis B markers were positive. Also, 8,3% those patients had anti-HCV simultaneously positive. There were no serological markers in 11,1% of the casuistic. 58.3% had HBsAg serological positive test. Coinfection was detected in 2.8%. Antibodies to HBc were positive in 86%, being present in 25% of cases in association with the anti-HBs. Among patients positive to HBsAg, anti-HBe was observed in 85.7%, anti-HBe in 9.5% and IgM anti-HBc in 57.1%. There were no positive anti-HD in any sample case. The HBV DNA was found in 37.7% of ali patients and in 65% of the HBsAg positive. The HCV RNA was detected in 8.5% of the sample but in 100% of the patients positive to anti-HCV. Sera from patients negative to HBsAg or to anti- HCV had any evidence of HBV DNA or HCV RNA. The AFP was above the normal value in 88.9% of patients, with levels up to 400ng/ml in 75% of them and in 27.8% high titers superior to 70000 ng/ml were observed. The abdominal ultrasonography identified liver tumors with nodules, multiple or single, present respectively in 63.9% and 36.1% of the sample. The predominant histological tumor was trabecular well differentiated carcinoma (p<0.05). The least Mean age and the highest AFP serum levei (p<0.01 ) were recorded among patients HBsAg posítive. Most of patients had advanced illness. A death rate of 38.9% were recorded. In conclusion, hepatitis B virus infection seems to be important in the etiology of HCC in the East Amazon. Improving preventive measures such immunization and screening for early diagnosis of liver tumors in the risk population should be emphasyzed. Further control or direct studies need to be done to elucidate important possible cofactors in the region that may contribute to a better understanding of the mechanisms enrolled in hepatocarcinogenesis.
Acesso aberto (Open Access)
Infecções pelos vírus das hepatites B e C e o carcinoma hepatocelular na Amazônia oriental
(2004) MIRANDA, Esther Castello Branco Mello; MÓIA, Lizomar de Jesus Maués Pereira; AMARAL, Ivanete do Socorro Abraçado; BARBOSA, Maria Silvia de Brito; CONDE, Simone Regina Souza da Silva; ARAÚJO, Marialva Tereza Ferreira de; CRUZ, Ermelinda do Rosário Moutinho da; DEMACHKI, Samia; BENSABATH, Gilberta; SOARES, Manoel do Carmo Pereira
In order to contribute to a better understanding of the possible role of hepatits B and C in the etiopathogenis of HCC in the East Amazon, there were studied 36 patients in Belém/PA. Serological hepatitis markers were evaluated and polymerase chain reaction assays were used to detect HBV-DNA and HCV-RNA. Alcohol abuse was observed in 33.3% and cirrhosis in 83.3%. In 88.9% of the sample, one or more hepatitis B markers were positive. Also, 8.3% those patients had anti-HCV simultaneously positive. The HBsAg serological test was positive in 58.3%; anti-HBc in 86%; anti-HBe in 85.7%; anti-HBe in 9.5%; IgM anti-HBc in 57.1%. The HBV DNA was found in 37.7% and in 65% of the HBsAg positive. The HCV RNA was detected in 8.5% and in 100% of' the patients positive to anti-HCV. The AFP was above the normal value in 88.9% of patients, with levels up to 400ng/ml in 75% of them. In conclusion, hepatitis B virus infection seems to be important in the etiology of HCC and improving measures such immunization and screening in the risk population should be emphasyzed.