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  • 1
    Digitale Medien
    Digitale Medien
    Reduced expression of the CD44 variant exons in oral squamous cell carcinoma and its relationship to metastasis (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 27 (1998), S. 0 
    Details
    ISSN: 1600-0714
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: In the present study, we examined the expression of CD44 variant exons in human oral squamous cell carcinoma (OSCC). Of ten cell lines from OSCCs, two (KB and H357), as well as the HeLa cell line, failed to express CD44 variant exons. In surgical specimens, all normal mucosa expressed CD44v9 (both mRNA and protein). Of 40 primary OSCCs, 19 (47.5%) showed downregulation of CD44v9, which correlated with tumor cell differentiation, primary metastasis to lymph nodes and secondary metastasis to lymph nodes. The results suggest that the downregulation of CD44v9 may play a role in lymphatic metastasis of OSCC and changes in its expression may be a useful diagnostic tool to determine the metastatic potential of OSCC to lymph nodes. Moreover, three cell lines that failed to express CD44 variant exons might become a useful experimental model to study the role of variant exons in the progression of OSCC.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-0714.1998.tb01941.x
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  • 2
    Digitale Medien
    Digitale Medien
    Phenotypic expression of human epidermal growth factor in foetal submandibular gland and pleomorphic adenoma of salivary gland (1988)
    Springer
    Virchows Archiv 412 (1988), S. 301-306 
    Details
    ISSN: 1432-2307
    Schlagwort(e): Human epidermal growth factor ; Foetal submandibular gland ; Pleomorphic adenoma ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The phenotypic expression of the human epidermal growth factor (EGF) was investigated immunohistochemically in human foetal submandibular glands from the 5th to 10th month of gestation, adult normal submandibular glands and 48 cases of pleomorphic adenomas. In foetal submandibular glands, both the terminal buds and primary ducts at the intermediate stage of gestation were positive for EGF, and in particular, the outer layer cells of primary ducts showed strong EGF-immunoreactivity. EGF-positive cells decreased as the gestational stage advanced and only ductal cells were weakly positive for EGF at the terminal stage of gestation. In the adult normal submandibular gland, weak immunoreactivity for EGF was restricted to ductal cells. However, 41 (86%) of the 48 pleomorphic adenomas had EGF-positive cells which were distributed among the ductal, chondroid and myxoid portion. No EGF-immunoreactivity was detected in the solid portion of pleomorphic adenomas. These results suggest that EGF may play an important role in the growth and differentiation of foetal cells as well as the proliferation of tumour cells in pleomorphic adenomas.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00750255
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  • 3
    Digitale Medien
    Digitale Medien
    Estrogen receptors in gastric adenocarcinoma: A retrospective immunohistochemical analysis (1988)
    Springer
    Virchows Archiv 413 (1988), S. 297-302 
    Details
    ISSN: 1432-2307
    Schlagwort(e): Estrogen receptor ; Gastric carcinoma ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Estrogen receptors (ER) in human gastric carcinomas were examined immunohistochemically using a specific monoclonal antibody to human ER. ER-immunoreactivity (ER-IR) was positive in 30 (27.8%) of the 108 gastric carcinomas examined. ER-IR was located in the nucleus of cancer cells. The incidence of ER-IR positive gastric carcinoma was not significantly different between male and female cases. However, the positive tumour cells were observed in 28 (39.4%) out of the 71 poorly differentiated adenocarcinoma, the incidence being significantly higher than that in well differentiated adenocarcinoma (p〈0.01). There was no significant difference in the incidence of ER-IR between scirrhous carcinoma and non-scirrhous poorly differentiated adenocarcinoma. Synchronous expression of ER and epidermal growth factor receptor was found in 8 of the 26 scirrhous carcinomas (30.8%). Patients with ER-IR positive scirrhous gastric carcinomas showed a much worse prognosis than those with ER-IR negative scirrhous carcinomas.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00783021
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  • 4
    Digitale Medien
    Digitale Medien
    Overexpression of human telomerase RNA is an early event in oesophageal carcinogenesis (1999)
    Springer
    Virchows Archiv 434 (1999), S. 483-487 
    Details
    ISSN: 1432-2307
    Schlagwort(e): Key words Human telomerase RNA ; In situ mRNA hybridization ; Oesophageal carcinoma ; Oesophageal dysplasia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Telomerase, the ribonucleoprotein enzyme that elongates telomeres, is repressed in normal human somatic cells but is reactivated during tumour progression. The purpose of this study was to investigate the localization of human telomerase RNA (hTR) expression in human oesophageal dysplasia and cancer by using in situ mRNA hybridization (ISH) with avidin–biotin staining. Ki-67 immunoreactivity was also examined. We analysed 51 squamous cell carcinomas, 9 dysplasias and 60 normal mucosae. The integrity of the mRNA in each sample was verified by using a poly d(T)20 probe. Seventy-six samples (63%) showed no mRNA degradation; these included 30 carcinomas, 7 dysplasias and 39 normal mucosae. At the single-cell level, high levels of hTR expression were found in the cytoplasm and especially in the nucleus. Most (〉90%) cancer cells demonstrated high levels of hTR expression in 29 (97%) of the 30 tumours. Most dysplastic cells also showed high levels of hTR in all 7 dysplastic cases. In all 39 normal mucosae, most basal cells indicated high levels of hTR expression, which were also seen in infiltrating lymphocytes. The distribution of hTR-expressing cells was similar to that of Ki-67-positive cells. These data suggest that overexpression of hTR may be correlated with the proliferative activity that defined by Ki-67 immunoreactivity and is an early event in carcinogenesis of the oesophagus.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004280050372
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  • 5
    Digitale Medien
    Digitale Medien
    Expression of cyclin E in colorectal adenomas and adenocarcinomas: correlation with expression of Ki-67 antigen and p53 protein (1996)
    Springer
    Virchows Archiv 429 (1996), S. 13-19 
    Details
    ISSN: 1432-2307
    Schlagwort(e): Cyclin E ; Colorectal adenoma ; Colorectal carcinoma ; Immunohistochemistry ; Ki-67 ; p53
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The expression of cyclin E in human colorectal adenomas and adenocarcinomas was examined immunohistochemically to elucidate the role of cyclin E in the colorectal carcinogenesis. The expression of cyclin E was detected in 25% (91/358) of the adenomas and 56% (149/267) of the adenocarcinomas. The incidence of strongly positive cases was significantly higher in the adenocarcinomas (20%) than in the adenomas (5%) (P〈0.01). Among adenomas, a significant correlation was noticed between the expression of cyclin E and the grade of atypia. The incidence of cyclin E expression was significantly higher in the adenocarcinomas without an adenoma component (62%; 104/169) than in those with this component (46%; 45/98) (P〈0.05). Furthermore, the incidence of the cyclin E expression was higher in stages 1 and 2 carcinoma than in stage 0 and stages 3 and 4 carcinoma. The expression of cyclin E was the most prominent in tumors invading the submucosa and muscularis propria. The expression of cyclin E was significantly correlated with the proliferative activity of the tumor cells measured by Ki-67 antigen expression (P〈0.01). It was also correlated with the expression of p53 protein in the tumor cells (P〈0.01). Overexpression of cyclin E and subsequent deregulation of cell cycle may contribute to the development and early progression of the colorectal carcinomas.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00196815
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  • 6
    Digitale Medien
    Digitale Medien
    Glicentin-containing cells in intestinal metaplasia, adenoma and carcinoma of the stomach (1984)
    Springer
    Virchows Archiv 404 (1984), S. 17-29 
    Details
    ISSN: 1432-2307
    Schlagwort(e): Endocrine cells ; Glicentin ; Intestinal metaplasia ; Adenoma ; Argyrophil cell carcinoma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Glicentin-containing cells (Glic. cells) in intestinal metaplasia, adenoma and carcinoma of the stomach were examined using immunohistochemical techniques. Glic. cells first occurred in the gastric mucosa of the transitional area between metaplastic and intact gastric glands. They frequently showed hyperplasia or micronoduli in the budding area of the deeper metaplastic glands, but in completely intestinalized mucosa these endocrine cells decreased remarkably. Gastric adenomas with mild dysplasia had a good number of glicentin-immunoreactive cells which were located in the deeper adenoma glands. Gastrin- and somatostatin-positive cells were also detected in the adenomas. The incidence of glicentin-positive tumor cells was significantly higher in well differentiated adenocarcinoma than in poorly differentiated adenocarcinoma. Among the seven cases of scirrhous argyrophil cell carcinoma, three showed glicentin- and glucagon-immunoreactivity in the same area of the tumor. These findings suggest that the selective increase of Glic. cells in intestinal metaplasia may be closely related to the development of gastric adenoma. Glicentin positive tumor cells in gastric carcinomas can be regarded to be an expression of intestinal or fetal markers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00704247
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  • 7
    Digitale Medien
    Digitale Medien
    Serotonin-containing EC cells in normal human gastric mucosa and in gastritis (1986)
    Springer
    Virchows Archiv 409 (1986), S. 313-323 
    Details
    ISSN: 1432-2307
    Schlagwort(e): Serotonin ; EC cells ; Human stomach ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Serotonin-containing EC cells in human fetal, infantile and adult stomachs both normal and affected by gastritis, were studied by immunohistochemical, electron microscopic and autoradiographic methods. EC cells were sparse in fetal and infantile stomachs, while they occurred in the lower half of the gastric mucosa in adult stomachs showing no atrophic changes and their distribution density was higher than that of D cells. With the progress of chronic gastritis, the number of EC cells gradually decreased, but intestinal type of EC cells appeared in intestinalized gastric mucosa, often showing hyperplasia. Most of EC cells showed argyrophil reaction, but only about 10-20% of them were positive with argentaffin. Epithelial cells with3H-TdR labeled nuclei were frequently detected in the gastric mucosa where EC cells were sparse or almost absent. Electron microscopically, EC cells had typical electron dense granules in both the normal gastric mucosa and in the intestinal metaplastic glands, but the number of secretory granules was greater in the latter than in the former. These findings suggested that EC cells are preferentially present in the gastric mucosa with a small number of labeled nuclei and have morphological heterogeneity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00708249
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  • 8
    Digitale Medien
    Digitale Medien
    Carcinogenesis and Metastasis (1993)
    Springer
    Journal of cancer research and clinical oncology 119 (1993), S. 560-563 
    Details
    ISSN: 1432-1335
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01686467
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  • 9
    Digitale Medien
    Digitale Medien
    p53 point mutations in primary human gastric carcinomas (1992)
    Springer
    Journal of cancer research and clinical oncology 119 (1992), S. 67-70 
    Details
    ISSN: 1432-1335
    Schlagwort(e): p53 gene ; Gastric carcinoma ; Point mutation ; Polymerase chain reaction ; Deoxynucleotide sequencing
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary p53 point mutations in primary gastric carcinomas were analyzed by performing cDNA deoxynucleotide sequencing of the gene. Out of 16,9 (56.3%) primary gastric carcinoma cases, including early cancer, showed one or more p53 point mutations in their open-reading frame, and 4 out of 9 cases had a p53 point mutation within highly conserved domains. The characteristics of the p53 mutation spectrum observed in primary tumors were (a) frequent mutation at an A:T pair (50%, 7 out of 14 mutations), (b) high transversion incidence (29%, 4 out of 14 mutations), (c) no transition at CpG, and (d) no G:C to T:A transversion. Our results suggest that p53 mutation is a common event in gastric carcinoma occurring from the early stage of progression with its specific mutation spectrum.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01209657
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  • 10
    Digitale Medien
    Digitale Medien
    Calcitonin in human gastric mucosa and carcinoma (1986)
    Springer
    Journal of cancer research and clinical oncology 112 (1986), S. 50-56 
    Details
    ISSN: 1432-1335
    Schlagwort(e): Immunohistochemistry ; Calcitonin ; Gastric mucosa ; Gastric carcinoma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The localization of immunoreactive calcitonin (IR-CT) in the human gastric mucosa and tumor tissues was studied using an immunohistochemical peroxidase-antiperoxidase method. A small number of IR-CT-containing cells were observed in both infant and adult gastric antral mucosa and the ratio of IR-CT-containing cells to G cells was about 1:50-100. Moreover, tissue content of IR-CT in normal antral mucosa was 2.37±0.35 ng/g wet weight. IR-CT-containing cells and G cells decreased with the progress of chronic atrophic gastritis and were totally absent in intestinal metaplastic glands. IR-CT was detected in G cells, suggesting a paracrine relation between gastrin and CT. IR-CT was not found in tumor cells of 35 gastric adenomas and 40 well differentiated adenocarcinomas. On the other hand, it was demonstrated in a very small number of tumor cells in 4 of 46 poorly differentiated adenocarcinomas, and in a good number in 3 of 7 scirrhous argyrophil cell carcinomas. IR-CT in plasma could serve, therefore, as a tumor marker of scirrhous endocrine cell carcinoma, and its production in cancer cells was considered to be eutopic rather than ectopic.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00394939
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