Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0024623 (gastric cancer)
 36,219 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Serum carcinoembryonic antigen (CEA) levels were determined preoperatively in 221 patients with well-differentiated gastric cancer. The mean preoperative serum CEA level was 15.9 +/- 88.5 ng/ml (1.0-1,133.0 ng/ml) for all patients, and the incidence of an elevated CEA (> 5 ng/ml) was 11.8% (26/221). The CEA-positive patients had larger tumors, a more prominent serosal invasion, more frequent lymphatic and vascular involvement, less expansive tumor growth and higher rates of lymph node and hepatic metastases than did the CEA-negative patients. Thus, the CEA-positive patients had a more advanced stage of disease, and 61.5% underwent noncurative resection (vs. 11.3% in CEA-negative patients). The survival rate of the CEA-positive patients was lower than that of the CEA-negative ones (p < 0.01). As the multivariate analysis revealed the preoperative CEA level to be an independent prognostic factor for survival, an assay for this antigen prior to surgery is to be recommended.
 ...
PMID:Predictive value of preoperative carcinoembryonic antigen levels for the prognosis of patients with well-differentiated gastric cancer. A multivariate analysis. 819 5

To improve the therapeutic efficiency adriamycin entrapped in antibody-conjugated liposomes, Fab' fragment was used instead of the whole antibody molecule. The murine monoclonal antibody, 21B2, against human carcinoembryonic antigen (CEA) was digested with pepsin, and the thiol residue of intra-heavy chain produced by reduction of F(ab')2 with dithiothreitol was conjugated to liposomes containing adriamycin. The tissue distribution of adriamycin delivered with these liposomes was studied in BALB/c nu/nu female mice bearing CEA-positive human gastric cancer strain MKN-45. An increase in delivery of adriamycin to the tumor was observed in the mice given liposomes with Fab' fragment as compared to those given liposomes with whole antibody. However, the preferential distribution of adriamycin in liposomes to the reticuloendothelial cells remained the same regardless of the use of Fab' fragment. For investigation of in vivo therapeutic effect, three i.v. injections of free adriamycin or adriamycin in liposomes equivalent to 5 mg/kg were given, and adriamycin in Fab' fragment-conjugated liposomes was found most effective in the inhibition of tumor growth. This was confirmed in terms of actual tumor weights excised and CEA concentration in the blood, as well as by pathological observations. The advantages of using Fab' fragment instead of whole antibody are discussed.
 ...
PMID:Improvement of therapeutic effect by using Fab' fragment in the treatment of carcinoembryonic antigen-positive human solid tumors with adriamycin-entrapped immunoliposomes. 820 Aug 55

In 120 operated cases of gastric cancer, nine tumor makers (serum carcinoembryonic antigen (CEA), alpha-fetoprotein (AFP), carbohydrate antigen 19-9 (CA19-9), carbohydrate antigen 125 (CA125), tissue polypeptide antigen (TPA), serum beta 2-microglobulin (s-BMG), urine beta 2-microglobulin (mu-BMG), serum immunosuppressive acidic protein (IAP) and sialic acid (SA)) were determined before operation, to explore distribution patterns, positive rates, and relationships among these markers. And, we explored tumor markers which would be useful in preoperative assessment of the cancer stage and feasibility of radical treatment. The following results were obtained. 1. The distribution of all tumor markers was close to normal logarithmic distribution. 2. The positive rate was high in the order of IAP > TPA > CEA > CA19-9 >s-BMG > SA > u-BMG > CA125 > AFP. 3. Strong correlations were observed between IAP and SA, between CA125 and TPA. 4. The optimum combination of markers for diagnosis of the cancer stage was IAP + CA19-9 + CA125 and the optimum combination for assessment of the feasibility of radical treatment was IAP + CA125 + TPA.
 ...
PMID:[Utility of measurement of tumor markers for preoperative staging of gastric cancer]. 824 75

Glutathione S-transferase (GST) and carcinoembryonic antigen were measured in the plasma of 95 patients with neoplasm of digestive tract, in 40 patients suffering from non-neoplastic diseases and in 40 healthy subjects. The mean value of the GST activity was significantly (P < 0.001) elevated in patients with gastric, liver and colorectal cancer (10.4 U/l, 14.1 U/l and 12.3 U/l respectively) as compared with the reference population (3.2 U/l). GST elevations above normal were observed in 26 (90%) patients with gastric cancer, in 18 (100%) with liver cancer and in 25 (89%) with colorectal cancer. Carcinoembryonic antigen appeared less sensitive. In 15 patients the postoperative levels of serum GST were increased after surgery then gradually declined and after 1 month showed a normalization in 10 patients. Our data suggest that GST measurement may be useful as a tumour marker in gastric, liver and colorectal cancer. Moreover the combined determination of GST and other markers increase the sensitivity for cancer detection.
 ...
PMID:Glutathione S-transferase activity in patients with cancer of the digestive tract. 827 May 99

We have found that elevation of preoperative serum sialyl-Tn antigen (STN) levels is associated with a poor prognosis for gastric cancer patients, and these high levels remain in the advanced stage of the disease. We have now examined findings with the combined assay of STN and carcinoembryonic antigen (CEA) levels with regard to prediction of the prognosis of gastric cancer patients. Serum CEA levels and STN levels were determined preoperatively in 349 Japanese patients with gastric cancer. The patients were divided into four groups: (A) the CEA (-) STN (-) group (CEA < or = 5 ng ml-1, STN < or = 45 U ml-1, n = 286); (B) the CEA (-) STN (+) group (CEA < or = 5 ng ml-1, STN > 45 U ml-1, n = 31); (C) the CEA (+) STN (-) group (CEA > 5 ng ml-1, STN < or = 45 U ml-1, n = 17); and (D) the CEA (+) STN (+) group (CEA > 5 ng ml-1, STN > 45 U ml-1, n = 15). Clinicopathological features and the prognosis of these groups were examined. The distribution of two markers showed no significant correlation. The patients in the CEA (+) STN (+) group (group D) had more advanced disease than the patients in CEA (-) STN (-) group (group A); tumour size was larger, serosal invasion was prominent, lymphatic and vascular involvement was frequent and the tumour was more infiltrative. Lymph node metastasis and hepatic metastasis were more common. Total gastrectomy was usually performed, and the non-curative rate was higher. The 5-year survival of patients in the CEA (+) STN (+) (group D) was 14.5 +/- 9.5%, that is lower than that of patients in any other group [CEA (+) STN (-) (group C) 44.1 +/- 12.7% (P < 0.05); CEA (-) STN (+) (group B) 60.1 +/- 9.5% (P > 0.05); CEA (-) STN (-) (group A) 77.6 +/- 9.5% (P < 0.05)]. This combined assay of these markers will aid in estimating the prognosis and selecting appropriate drugs and care for gastric cancer patients.
 ...
PMID:Combined evaluation of preoperative serum sialyl-Tn antigen and carcinoembryonic antigen levels is prognostic for gastric cancer patients. 828 1

To determine the expression of various protein-tyrosine phosphatases (PTPs) in human gastric cancers, cDNAs encoding conserved PTP domains were amplified by reverse transcriptase polymerase chain reaction from KATO-III cell mRNA and sequenced. Among 72 polymerase chain reaction clones, one of the cDNA sequences encoded a novel potential PTP (stomach cancer-associated PTP, SAP-1). The full length (3.9 kilobases) of the SAP-1 cDNA was further isolated from the KATO-III cell cDNA library and the WiDr cell cDNA library. The predicted amino acid sequence of the SAP-1 cDNA showed that mature SAP-1 consisted of 1093 amino acids and a transmembrane-type PTP, which possessed a single PTP-conserved domain in the cytoplasmic region. The extracellular region of SAP-1 consisted of eight fibronectin type III-like structure repeats and contained multiple N-glycosylation sites. These data suggest that SAP-1 is structurally similar to HPTP beta and that SAP-1 and HPTP beta represent a subfamily of transmembrane-type PTPs. SAP-1 was mainly expressed in brain and liver and at a lower level in heart and stomach as a 4.2-kilobase mRNA, but it was not detected in pancreas or colon. In contrast, among cancer cell lines tested, SAP-1 was highly expressed in pancreatic and colorectal cancer cells. The bacterially expressed SAP-1 fusion protein had tyrosine-specific phosphatase activity. Immunoblotting with anti-SAP-1 antibody showed that SAP-1 is a 200-kDa protein. In addition, transient transfection of SAP-1 cDNA to COS cells resulted in the predominant expression of a 200-kDa protein recognized by anti-SAP-1 antibody. SAP-1 is mapped to chromosome 19 region q13.4 and might be related to carcinoembryonic antigen mapped to 19q13.2.
 ...
PMID:Molecular cloning of a human transmembrane-type protein tyrosine phosphatase and its expression in gastrointestinal cancers. 829 59

In spite of its reputation as a tumour marker, little is known about the function of carcinoembryonic antigen (CEA). We examined the mRNA expression of CEA and NCA in 26 gastric and 14 colorectal cancers together with adjacent morphologically normal mucosae. There was no significant difference between the CEA mRNA levels of colorectal cancer and adjacent mucosa, whereas the CEA mRNA levels were significantly elevated in gastric cancer compared with normal gastric mucosa. The expression of NCA, on the other hand, was more cancer-specific and was significantly up-regulated in both gastric and colorectal cancers compared with the corresponding normal mucosae. No correlation was found between the mRNA level and plasma CEA value. No significant up-regulation was recognised in the node positive cancer, cancer with distant metastasis, or the metastatic tissues themselves. Marked diversity in the degree of differentiation in gastric cancer tissues, however, resulted in varied expression of the CEA gene family, compared with the constantly high expression found in colorectal cancer. Further analysis revealed significant up-regulation of NCA in well and moderately differentiated gastric cancers over poorly differentiated cancers, suggesting that NCA might have roles in differentiation.
 ...
PMID:Expression of carcinoembryonic antigen (CEA) and nonspecific crossreacting antigen (NCA) in gastrointestinal cancer; the correlation with degree of differentiation. 831 3

Serum carcinoembryonic antigen (CEA) levels were determined in 68 patients with Stage IV gastric cancers, the objective being to examine the clinicopathological relationship between the metastatic patterns of gastric cancer and the serum CEA level. Of the 68 patients, 31 were diagnosed as cases of liver metastases and 37 as cases of peritoneal dissemination. Serum CEA levels were elevated in 21 of 31 patients (67.8%) with liver metastases and in 7 of 37 patients (18.9%) with peritoneal dissemination (P < 0.01). A univariate analysis showed that liver metastasis correlated with a young age (P < 0.01), the lower portion of stomach (P < 0.05), Borrmann types 1 and 2 (P < 0.01), differentiated type (P < 0.01), and nonserosal involvement (P < 0.05) more than did peritoneal dissemination. A multivariate analysis showed that in addition to Borrmann type 1 and 2, elevated CEA levels (> 2.5 ng/ml) is an independent risk factor involved in liver metastasis. Thus careful follow-up and postoperative adjuvant therapy are required for patients with elevated CEA levels, even with "curative" resection.
 ...
PMID:Carcinoembryonic antigen (CEA) in stage IV gastric cancer as a risk factor for liver metastasis: a univariate and multivariate analysis. 834 Oct 54

The expression of carcinoembryonic antigen (CEA) by tumor cells from freshly excised human gastric cancers was investigated using flow cytometry (FCM). Highly purified fresh human cancer cells were obtained from solid tumors in 20 patients and from malignant ascites in 6 patients. Thirteen of the 26 tumors were positive for CEA by FCM. CEA expression was more common in well-differentiated tumors than in poorly differentiated tumors. CEA expression was investigated by both FCM and immunohistochemistry in 9 patients, and the two methods agreed in 8 of them. However, quantitative evaluation of CEA expression could only be performed by FCM and not by immunohistochemical staining. FCM could analyze the expression of CEA not only on the cell membrane but also in the cytoplasm, by using gastric cancer cells with or without Triton X-100 treatment. Thus, this study showed that CEA expression can be determined and evaluated quantitatively by FCM.
 ...
PMID:Expression of carcinoembryonic antigen in fresh human gastric cancer cells assessed by flow cytometry. 844 Dec 76

The regulation by interferon-gamma (IFN-gamma) of the expression of seven distinct human tumor-associated antigens [M 110,000, carcinoembryonic antigen (CEA), nonspecific crossreacting antigen (NCA), CA19-9, 17-1A, TAG-72, and D612] was studied in eight human gastric cancer cell lines. Six of the seven tumor antigens have been well-characterized and reported to be expressed by human gastric carcinomas. The M(r) 110,000 antigen has been recently identified in six of the eight human gastric cancer cell lines and may represent a potentially novel gastric tumor antigen. IFN-gamma administration substantially increased the expression of the M(r) 110,000 antigen in six gastric tumor cell types, and, furthermore, induced its expression de novo in another gastric tumor cell line (GaCa). Constitutive CEA and NCA expression was detected on the surface of five of the eight gastric carcinoma cell lines. IFN-gamma treatment induced only a modest increase in the level of expression of those related antigens, but those changes were accompanied by increases in the level of the respective mRNA transcripts. Four other human tumor-associated antigens, TAG-72, CA19-9, D612, and 17-1A, were found either to be not constitutively expressed and/or not regulated by IFN-gamma. The results indicate the selective nature by which IFN-gamma regulates the M(r) 110,000 antigen and, to a lesser extent, the antigens of the CEA gene family.
 ...
PMID:Comparison of the interferon-gamma-mediated regulation of tumor-associated antigens expressed by human gastric carcinoma cells. 850 1


<< Previous 1 2 3 4 5 6 7 8 9 10