Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0027651 (tumor)
 685,946 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The value of serum bile acids (SBA) in the diagnosis of hepatobiliary disease has been investigated. A modified GLC method was used, with an overall coefficient of variation of +/- 11% in the control range. Serum was obtained after a 12 hour fast, and two hours after a fatty meal from 73 patients and 14 control subjects. In controls the total fasting SBA of 2.17 +/- 0.86 mumol/l increased significantly (p less than 0.001) to 3.81 +/- 1.14 mumol/l after a meal. All icteric patients had raised SBA, but in 23 anicteric patients there was no significant difference in the detection of chronic liver disease by fasting SBA, postprandial SBA, AST, or gamma GTP. Compared with controls, serum in patients contained proportionately less deoxycholic acid (p less than 0.001), there was proportionately more cholic acid in extrahepatic obstruction (p less than 0.001), and proportionately more chenodeoxycholic acid in patients with cirrhosis, viral hepatitis, and neoplasia (p less than 0.001). In control subjects, the fasting cholic:chenodeoxycholic acid ratio ranged from 0.5-1.0, and differed significantly (p less than 0.001) from patients with extrahepatic obstruction 0.96-3.6, and cirrhosis 0.1-0.5. It is concluded that serum bile acids measured by sensitive methods can provide useful diagnostic information.
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PMID:Serum bile acids in the diagnosis of hepatobiliary disease. 59 Aug 51

The diagnostic value of CSF lactate dehydrogenase and aspartate transaminase in cases of brain tumours (except for CSF AST in the benign tumours), congenital hydrocephalus, and brain abscess is established. Tumour cyst fluids show a higher enzymatic activity than does the CSF. The two enzyme estimations do not help in differentiating the supratentorial from the infratentorial tumours. CSF AST is superior to CSF LD in discriminating the malignant and benign tumours, in so far as the AST is increases selectively in malignancy. Estimates of CSF LD are slightly superior to those of CSF AST, both in incidence of abnormality and the degree of their rise.
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PMID:Lactate dehydrogenase and aspartete transaminase of the cerebrospinal fluid in patients with brain tumours, congenital hydrocephalus, and brain abscess. 101 Oct 18

Serum tissue polypeptide antigen (TPA) was determined in 86 cirrhotic patients who underwent a thorough clinical and laboratory evaluation. Increased serum TPA levels were found in 87.2% of the patients (81% of Child's A, 81.3% of Child's B and 97% of Child's C) with very high levels in some cases. There were significant correlations between TPA and several clinical and biochemical tests, especially AST (r = 0.678, p < 0.000001), and this enzyme was the best predictor of TPA levels. Patients with abnormal AST had also significantly higher serum levels of TPA than those with normal AST in each of the Child's class (p < 0.01 for each). TPA values were found to be more frequently abnormal than AST ones in cirrhotics (p = 0.009) and could be used as indirect markers of activity in these patients. The underlying mechanism involved in the increase in TPA in cirrhosis was probably related to the cytolytic/regenerative activity of the liver. TPA cannot be used as a tumor marker in these patients.
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PMID:A clinical and laboratory evaluation of the behavior of tissue polypeptide antigen in liver cirrhosis. 129 4

A case of non-Hodgkin's lymphoma showed a phenotypic and genotypic cell lineage switch twice during nine years of his clinical history; first, T-cell type, pleomorphic small cell lymphoma developed, followed by B-cell type, diffuse centroblastic/centrocytic lymphoma, and finally T-zone lymphoma without follicles again developed, from which AST-1 cultured cell line was established. Karyotype analysis demonstrated a shared abnormal chromosome, der(1)t(1;?)(p36;?), among the first relapsed B-cell tumor, the second relapsed T-cell tumor and AST-1 cell line. Furthermore, T-cell receptor (TCR) gamma gene rearrangement bands of the same size were observed in the first relapsed B-cell tumor and the second relapsed T-cell tumor as well as AST-1 cell line. These results suggested that both relapsed tumors of different cell lineages are derived from a common malignant clone, presumably a committed lymphoid stem cell. A unique translocation, t(2;14)(q37;q11.2), which may involve TCR delta/alpha gene complex, was observed in the second relapsed tumor and AST-1 cells. To attempt to isolate the breakpoint of this translocation, the configuration of TCR delta/alpha gene complex was studied. The result showed that two rearrangements of TCR alpha gene detected with J alpha probes were the products of the normal TCR rearrangement process, and were not involved in the translocation at this region. This patient, together with the AST-1 cell line, provided us a unique opportunity to study the development and clonal evolution of malignant lymphoma.
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PMID:Phenotypic and genotypic lineage switch of a lymphoma with shared chromosome translocation and T-cell receptor gamma gene rearrangement. 131 86

Rat liver cytosolic sulfotransferase activity forms the highly reactive sulfuric acid ester of N-hydroxy-2-acetylaminofluorene (N-OH-2AAF), an ultimate carcinogen in 2-acetylaminofluorene (2AAF) hepatocarcinogenesis. A previous report demonstrated that 2AAF-induced liver hyperplastic nodules displayed a persistent loss of cytosolic N-OH-2AAF sulfotransferase activity following a hepatocarcinogenesis-producing regimen of 2AAF administration. As an initial step in examining the mechanism responsible for lowering N-OH-2AAF sulfotransferase activity, a monospecific polyclonal antibody to aryl sulfotransferase IV (AST IV) was produced and used in the assessment of AST IV as a candidate enzyme for liver cytosolic N-OH-2AAF sulfotransferase activity. Studies comparing the levels of N-OH-2AAF sulfotransferase activity of highly purified AST IV and rat liver cytosols with corresponding immunochemical analysis of AST IV contents demonstrated that there was sufficient AST IV activity in liver cytosols to indicate that it was the primary enzyme catalyzing cytosolic N-OH-2AAF sulfation. A subsequent immunochemical survey of nine extrahepatic tissues showed no detectable AST IV content and indicated that AST IV expression may be tissue specific. An immunochemical comparison of AST IV levels in control liver cytosols (high in sulfotransferase activity) with cytosols from 2AAF-derived hyperplastic nodules (low in sulfotransferase activity) or liver tumors (no sulfotransferase activity) showed low or no detectable levels, respectively, of AST IV. In addition, an immunochemical analysis of four rat hepatoma cell lines showed they contained no detectable levels of AST IV. These results suggested a strong correlation existed between a decrease in AST IV expression and tumor development. When the liver cytosols of rats taken from early, intermediate, and late stages of 2AAF carcinogenesis were analyzed for the development of a persistent loss of N-OH-2AAF sulfotransferase activity, a parallel loss of cytosolic N-OH-2AAF sulfotransferase activity and AST IV content was observed in rats which had proceeded from a stage of low risk to high risk for liver cancer. These findings indicated that (a) AST IV, a liver-specific enzyme, was the principle enzyme comprising cytosolic N-OH-2AAF sulfotransferase activity and (b) the decrease in sulfotransferase activity in nodules and tumors resulted from a decrease in the level of AST IV expression. Furthermore, it is suggested that a persistent decrease in AST IV expression may reflect a role for AST IV as part of a resistance phenotype in which transforming liver cells are able to escape the cytotoxic effects of highly reactive 2AAF metabolites and progress to cancer.
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PMID:2-Acetylaminofluorene-mediated alteration in the level of liver arylsulfotransferase IV during rat hepatocarcinogenesis. 238 38

Increased AFP levels in patients with hepatocellular carcinoma are mainly related to tumor size and in a lesser degree, to AST levels. Abnormal and/or diagnostic AFP levels will be observed in a reduced proportion of patients with small HCC (less than 5 cm). Therefore, AFP measurement is of little value in the early detection of HCC.
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PMID:Alpha-fetoprotein in the early diagnosis of hepatocellular carcinoma. 248 Apr 20

All cases of liver tumor referred to the King Faisal Specialist Hospital and Research Centre in Saudi Arabia during 2.5 years were reviewed. Hepatocellular carcinoma, 104 cases, was considerably more common than metastatic carcinoma with unknown primary, 15 cases. Lymphoma presenting as liver tumor occurred in three cases and there were no cases of cholangiocarcinoma. There were only two cases of benign tumor, both hemangioma. Hepatocellular carcinoma was characterized by a male predominance of 6:1, positive hepatitis B surface antigen in 60%, presentation with an enlarged, hard liver in over 90%, a systolic-diastolic bruit over the mass in 45%, a single highly echogenic lesion in the right lobe on ultrasound in 80%, and rapid progression. The serum AST (aspartate aminotransferase, serumglutamic oxalacetic transaminase [SGOT]) was abnormal in 97% and was higher than the alanine aminotransferase (ALT) in 93% of cases compared with 17% in 100 consecutive cases of chronic active hepatitis. Sixty-six percent of patients with hepatocellular carcinoma had serum AFP greater than 200 ng/ml. Excluding five cases of germ cell tumor (none involving the liver), and pregnant patients, serum AFP was less than 200 ng/ml in all other patients in whom it was measured between 1979 and 1981. A practical approach to the diagnosis of hepatocellular carcinoma is outlined. Biopsy does not appear to be indicated in many cases of advanced hepatocellular carcinoma.
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PMID:Hepatic tumors in Saudi Arabia. A practical approach to diagnosis. 257 17

Circulating immune complexes (CIC) were measured at the time of diagnosis in 81 patients with acute leukemia or blast crisis of chronic myeloid leukemia using precipitation by 3.75% polyethyleneglycol. Elevated CIC levels did not adversely influence complete remission duration and survival, patients with normal CIC levels exhibited mostly shorter remission and survival than those with elevated or borderline levels. No significant correlation was observed between CIC levels and Hb, WBC, CBC, platelet count, age, serum bilirubin, total protein, fibrinogen, AST and ALT levels, presence of hepatosplenomegaly and/or lymphadenopathy, HbSAg positivity, complete remission duration and survival. The lack of correlation may be caused by altered immune response in leukemic patients, but the obtained results may also be affected by the nonspecific nature of the method used for the detection. Simultaneous detection of CIC levels by multiple tests and evaluation not only of the number but also of the composition and size of CIC may decrease the incidence of false results. Nevertheless, only the establishment of antigen-specific assays may resolve the controversies in the detection of CIC and thus contribute to a more precise assessment of the role of CIC in prognosis of cancer, as well as to the verification of reliability of using CIC as a tumor marker.
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PMID:Circulating immune complexes in acute leukemia. 270 22

We have shown in earlier studies that repeated weekly exposures of a human astrocytoma clone (AST 3-4) to MeCCNU (10 micrograms/ml for 1 h per week) produced a linear decrease in survival over the first 3 weekly treatments. But, after that time these cells became progressively more resistant to the 10 micrograms/ml concentration of the agent. In the studies reported here we show that these previously treated cells were also less responsive to other doses ranging from 1 to 30 micrograms MeCCNU/ml. This change in sensitivity to MeCCNU was accompanied by collateral changes in response to other agents: resistance to BCNU and Galactitol, increased sensitivity to Adriamycin, and no change to ionizing radiation. These experiments suggest that once repeated treatments with a single agent cause a tumor cell population to become more resistant, sensitivity to other agents may also change unpredictably.
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PMID:Changes in drug sensitivity of a human astrocytoma clone previously treated with 1-(2-chloroethyl)-3-(4-methylcyclohexyl)-1-nitrosourea in vitro. 322 42

A total of 104 patients with various liver diseases were studied. Hepatic biopsy was performed and the AST, ALT and TPA in serum were measured. Higher levels of TPA, AST and ALT were found in CAH and LC, lower in CPH and MHP. High serum TPA values, usually suggesting the possibility of neoplasm, should be considered with attention. A follow-up with periodic TPA assays (in addition to AST and ALT) is suggested in patients with acute hepatitis, in order to predict further possible complications such as CAH and LC.
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PMID:Tissue polypeptide antigen (TPA) modifications in hepatic cirrhosis, aggressive chronic hepatitis, persistent chronic hepatitis, and in minimal pathology. 324 78


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