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

We examined the correlation among preoperative serum carcinoembryonic antigen (CEA) levels, staining properties of the tumors by CEA immunohistochemistry and the tumorigenicity of their xenografts in nude mice, in 28 patients with gastric cancer. Eleven (40 per cent) of them were positive for serum CEA (greater than or equal to 2.5 ng/ml) and seven (25 per cent) of the xenografts were tumorigenic in nude mice. All the tumorigenic cases were positive for serum CEA (p less than 0.001) and the mean value of the serum CEA level in the patients with tumorigenic neoplasms was 20.8 ng/ml, being significantly higher than that (1.4 ng/ml) in the patients with non-tumorigenic neoplasms (p less than 0.001). Twenty-five of the 28 carcinomas (89 per cent) were positive for CEA staining in their cancer cells by the ABC method and CEA localization correlated with tumorigenicity (p less than 0.05). These results suggest that the serum CEA level in patients is correlated with the tumorigenicity of their gastric carcinoma xenografts in nude mice and may account for the poor prognosis of patients with high serum CEA.
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PMID:Serum CEA levels in patients with gastric carcinoma correlate with the tumorigenicity of their xenografts in nude mice. 204 Dec 38

Two murine monoclonal antibodies MG7 and MGd-1 were used to label tissue specimens of gastric cancer and precancerous lesions with ABC method. The antigen to MG7 had a higher specificity to gastric cancer. The positive rate was 47.5% in early gastric cancer, 57.1% in advanced. But it was lower in precancerous lesions: 12.5% in dysplasia, 5% in intestinal metaplasia, 40% in adenoma. In addition, the stain was weaker than in gastric cancer. The antigen to MGd-1 had a higher positive rate in gastric cancer. It was 65.0% in early cancer, 88.6% in advanced. The positive rate was also high in precancerous lesions: 25.6% in intestinal metaplasia, 30.0% in adenoma, 57.5% in dysplasia. MG7 and MGd-1 did not react with the normal tissue and embryo gastric mucosa. Histologically, they show the strongest reaction to signet ring cell cancer.
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PMID:[Distribution of monoclonal antibodies MG7 and MGd-1 against gastric carcinoma in stomach cancer]. 217 29

A case of an AFP-producing gastric cancer accompanied with non-epithelial tumor is reported. A 63-year-old man, complaining of an epigastric hunger pain, was admitted to our hospital. Testing revealed that he had an extremely high level serum AFP (12,400 ng/ml) with no abnormality of liver function. A barium ingestion and a subsequent endoscopic examination determined the existence of a Borrmann III type advanced gastric cancer on the lesser curvature, extending from middle corpus to the antrum. Diagnostic imaging did not reveal any metastatic lesion in liver. After a total gastrectomy, the patient's serum AFP level rapidly decreased, followed by a recurrence he developed of a carcinomatous pleuritis and death. On autopsy, an enlargement of the right testis was noticed for the first time. Histologically, it was found to be a malignant, non-epithelial tumor, which proved negative for anti-AFP staining by the ABC method and positive for anti *L-26. On the other hand, the gastric cancer was a poorly differentiated adenocarcinoma with a hepatoid differentiation which was positive for anti-AFP staining and negative for anti-L-26 so it thus was diagnosed as an AFP-producing gastric cancer.
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PMID:[A case of AFP-producing gastric cancer accompanied with testicular tumor]. 246 35

We studied p53 gene at the DNA and protein level in human gastric cancer tissues and corresponding normal gastric mucosae from 20 cases of patients undergone radical surgery. By Southern blotting, the p53 gene was found to be partially deleted in 30% (6/20) of gastric cancer tissues. ABC immunohistochemical study of p53 expression was carried out on cryostat sections using monoclonal antibodies (PAb 1801) to p53. High level expression of mutated p53 protein was detected in 55% (11/20) gastric cancer tissues. The staining pattern was intranuclear and/or intracytoplamic. There was no detectable staining of any of the normal gastric tissues with 1801 antibody. The positive rate of p53 overexpression was higher in poorly-differenciated glandular carcinomas than well-differenciated cancer (P = 0.0116). Highly significant association exists between high level p53 expression and allele deletion (r = 0.59). The date indicate that inactivation of p53 gene is important in human gastric carcinogenesis and tumor progression. The assay of p53 gene structure and products may provide new biologically relevant tumor marks for predicting the behavior of gastric carcinomas, identifying more aggressive tumors, determining prognosis of the patients and guiding treatment.
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PMID:[p53 gene deletion and abnormal expression in gastric carcinoma]. 765 19

Loss or inactivation of p53 gene--a suppressor oncogene has been considered to be one of the important mechanisms in the development of human tumors. One of the evidences for mutation of allelic gene of p53 is the identification of p53 protein concentrated in the nuclei of related cells. By using ABC immunohistochemical method, we studied the expression of p53 in cryostatic sections of the tumor tissue and adjacent mucosa resected from 38 patients with gastric cancer. p53 was found to be positive in the nuclei with intensive staining in 24 out of 38 cases with carcinoma (63.2%). p53 positive cells were distributed diffusively in the cancer tissue. All the adjacent mucosa specimens except 10 were negatively stained with p53 monoclonal antibody. These 10 specimens including 3 with dysplasia and 4 with metaplasia were only weakly stained. p53 was also found to be positive in 18 out of 23 cancer patients with metastasis in perigastric lymph nodes (78.3%). We also studied in the same section the nucleolar organizer region-associated proteins (AgNORs) with using silver staining technique to find if there is any relationship between p53 gene mutation and the activity of rRNA transcription of tumor cells. The number of AgNORs dots per nucleus detected in gastric cancer sections with positive staining of p53 (9.9 + 2.14) was greater than those with p53 negative staining (7.2 + 1.68). There was a significant statistical difference between the two groups (P < 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[The expression of mutant p53 gene in gastric carcinoma]. 786 23

In vitro labelling index (L.I.) of bromodeoxyuridine (BrdU) was evaluated as a preoperative predictor of gastric cancer development. Biopsy specimens were obtained endoscopically from 187 gastric cancer patients preoperatively. Specimens were incubated in RPMI containing BrdU under carbogen gas at 3 times atmospheric pressure. They were fixed and embedded in paraffin. After slicing and dewaxing, they were denatured in 2N HCl. Then BrdU were stained by ABC method and labelling index was calculated. Patients with L.I. more than 10% had a significantly higher risk of lymph node involvement (p < 0.001) and venous invasion (p < 0.05). Those with L.I. more than 20% had a significantly higher risk of liver metastasis (p < 0.01), while patients with L.I. more than 25% had a significantly higher risk of submucosal invasion (p < 0.01). In conclusion in vitro BrdU labelling is a technique available as a preoperative predictor of node involvement, venous invasion, submucosal invasion and prognosis in gastric cancer.
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PMID:[Preoperative prediction of gastric cancer development by in vitro labelling index of bromodeoxyuridine]. 848 87

Ample evidence has been provided concerning the presence of tenascin in various histological subtypes of gastric cancer. However, conflict and discussion still persist regarding the correlation with different classification systems and prognostic impact. Therefore, we studied 203 adenocarcinomas of the stomach with special emphasis to the WHO-classification, Lauren's and Goseki's subtypes as well. The immunohistochemical ABC-method was applied using a monoclonal anti-human-tenascin antibody. 30% of all tumours showed a distinct staining reaction. Tubulo-papillary carcinomas (WHO) revealed a significantly stronger reactivity than signet-ring subtypes. Adenocarcinomas of intestinal type (Lauren) were significantly more positive than the diffuse types. Mucin-poor tumours (Goseki I+III) stained positive in a much higher degree compared to mucin-rich subtypes (Goseki II+IV). However, no correlation could been demonstrated regarding TNM-stage or prognosis.
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PMID:Tenascin expression in gastric cancer with special emphasis on the WHO-, Lauren-, and Goseki-classifications. 1037 35

AIM:To investigate the expression of multiple genes and the behavior of cellular biology in gastric cancer (GC) and other gastric mucosal lesions and their relations to Helicobacter pylori (H. pylori) infection, tumor staging and histological subtypes.METHODS:Three hundred and twenty seven specimens of gastric mucosa obtained via endoscopy or surgical resection, and ABC immunohistochemical staining were used to detect the expression of p53, p16, Bcl-2 and COX-2 proteins.H. pylori was determined by rapid urea test combined with patholo-gical staining or 14 Curea breath test. Cellular image analysis was performed in 66 patients with intestinal metaplasia (IM) and/or dysplasia (Dys). In 30 of them, both cancer and the paracancerous tissues were obtained at the time of surgery. Histolo-gical pattern, tumor staging, lymph node metastasis, grading of differentiation and other clinical data were studied in the medical records.RESULTS:p16 expression of IM or Dys was significantly lower in positive H. pylori chronic atrophic gastritis (CAG) than those with negative H. pylori (CAG: 54.8% vs 88.0%, IM:34.4% vs 69.6%, Dys: 23.8% vs 53.6%, all P < 0.05), Bcl-2 or COX-2 expression of IM or Dys in positive H. pylori cases was signi-ficantly higher than that without H. pylori (Bcl-2: 68.8% vs 23.9%, 90.5% vs 60.7%; COX-2: 50.0% vs 10.8%, 61.8% vs 17.8%; all P <0.05). The mean number of most parame-ters of cellular image analysis in positive H. pylori group was significantly higher than that in negative H. pylori group (Ellipser: 53 plus minus 14, 40 plus minus 12&mgr;m, Area(1): 748 plus minus 572, 302 plus minus 202&mgr;m(2), Area(2): 3050 plus minus 1661, 1681 plus minus 1990&mgr;m(2), all P< 0.05; Ellipseb: 79 plus minus 23, 58 plus minus 15&mgr;m, Ratio-1: 22% plus minus5%,13% plus minus4%,Ratio-2:79% plus minus17%,53% plus minus20%,all P<0.01). There was significant correl-ation between Bcl-2 and histologic pattern of gastric carcinoma, and between COX-2 and tumor staging or lymph node metasta sis (Bcl-2: 75.0% vs16.7%; COX-2: 76.0% vs 20.0%, 79.2% vs 16.7%; all P< 0.05).CONCLUSION:p16, Bcl-2, and COX-2 but not p53 gene may play a role in the early genesis/progression of gastric carcinoma and are associated with H. pylori infection. p53 gene is relatively late event in gastric tumorigenesis and mainly relates to its progression. There is more cellular-biological behavior of malignant tumor in gastric mucosal lesions with H. pylori infec-tion. Aberrant Bcl-2 protein expression appears to be preferentially associated with the intestinal type cancer. COX-2 seems to be related to tumor staging and lymph node metastasis.
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PMID:Multiple genetic alterations and behavior of cellular biology in gastric cancer and other gastric mucosal lesions:H.pylori infection, histological types and staging. 1181 7

The aim of this study was to ascertain whether MG7Ag is a useful predictor of evolution of gastric dysplasia to carcinoma. A total of 1090 patients with confirmed dysplasia were stained immunohistochemically with MG7 monoclonal antibody by the ABC method. A prospective follow-up study was undertaken on 19 patients with MG7Ag positive staining and 16 with MG7 negative staining over a period of 10-78 months. The expression of MG7Ag was also compared in another two groups by conducting retrospective studies. One group showed an evolution into gastric cancer over 2-4 years, the other did not. Quantitative analysis of MG7Ag expression was carried out on the last two groups. The receiver operating characteristic curve and Youden index were used to assess the best critical value for MG7Ag. MG7Ag was found positive in 456/1090 cases (41.8%) with dysplasia. Prospective follow-up of 35 patients showed that 6/19 patients with MG7Ag positive staining developed gastric cancer, but there were no carcinomatous changes in 16 patients with MG7 negative staining. The results of MG7Ag expression in 72 cases with retrospective follow-up showed there were 24 with positive immunostaining among 34 cancerous cases (70.6%), and only 7 in 38 non-cancerous cases (18.4%) (p<0.01). Image analysis showed that an average MG7Ag density index ++0.19 could be regarded as the critical value for high risk of gastric mucosa with dysplasia evolving to cancer. Positive MG7Ag expression in gastric mucosa of patients with dysplasia, especially in cases with a density index ++0.19, was an indicator of high risk of malignant change.
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PMID:The value of MG7 antigen in predicting cancerous change in dysplastic gastric mucosa. 1201 18

The breast cancer resistance protein (BCRP), also known as mitoxantrone resistance protein (MXR) or placenta ABC protein (ABC-P), is the second member of the ABCG subfamily of ABC transport proteins (gene symbol ABCG2). BCRP has been detected in acute myeloid leukaemia and in breast, colon and gastric cancer but there has been no reports regarding BCRP expression in acute lymphoblastic leukaemia (ALL). We report the first results of BCRP expression in childhood ALL. Sixty-seven children (47 initial stage, 20 relapses) with ALL were analysed for BCRP gene expression by TaqMan real-time polymerase chain reaction. The expression of BCRP in mononuclear cells obtained from the bone marrow (BM) and peripheral blood (PB) of healthy donors was also investigated. There was no relationship between BCRP expression and age, sex, initial blast cell count, prednisolone response or BM response on d 15 and 33. Patients with T-lineage ALL showed a lower expression of BCRP (P = 0.044). Kaplan-Meier analysis of the relapse-free interval showed no prognostic significance of BCRP expression when different levels of BCRP expression were used as cut-off points. No significant difference in expression of BCRP mRNA was measured between initial-stage and relapsed-stage ALL or between normal MNC obtained from BM and ALL patients. The results indicate a low expression of BCRP in childhood ALL. Relationships between BCRP and clinical, molecular or in vivo resistance characteristics of the patients were not observed.
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PMID:Expression of the BCRP gene (ABCG2/MXR/ABCP) in childhood acute lymphoblastic leukaemia. 1210 Jan 41


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