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

The distribution of acid phosphatase in Ehrlich ascites carcinoma cells was studied by histochemical techniques in mice treated with antitumoral agents (Tio-Tepa, Cosmegen). The results proved the accuracy of the histoenzymatic demonstration of APh activity for the study of early changes induced in Ehrlich ascites tumor by antitumoral drugs : these changes precede those revealed by routine histological methods and are related to the degree of sensitivity of the tumor to the drugs.
 ...
PMID:The effect of cancer chemotherapy on lysosomal enzymic activities (acid phosphatase) of Ehrlich ascites carcinoma cells. 12 97

Seven cases of capillary hemangioblastoma from the cerebellum and spinal cord were studied by immunohistochemical methods to determine the origin of the stromal cells. A subpopulation of factor XIIIa-positive tumor cells was a constant feature in hemangioblastomas. These stellate or spindle-shaped cells transformed into typical vacuolated stromal cells. Factor VIII-related antigen was limited to the vascular endothelium. Glial fibrillary acidic protein was present only in entrapped astrocytes. Staining for alpha-1-antitrypsin (alpha 1AT) and alpha-1-antichymotrypsin (alpha 1 ACT) was occasionally observed in stromal cells. It was concluded that the factor XIIIa-positive stromal cells in capillary hemangioblastoma indicate fibrohistiocytic differentiation, which is part of the differentiation spectrum of hemangiopericytomas.
 ...
PMID:Fibrohistiocytic differentiation in capillary hemangioblastoma. 135 64

Twenty-five benign pleomorphic adenomas of salivary glands in children were studied with immunohistochemical techniques in order to characterize the cell types comprising the epithelial and so-called "mesenchymal" regions of the tumors. The antisera against alpha 1-antichymotrypsin (alpha 1-ACT) and alpha 1-antitrypsin (alpha 1-AT) were used to stain in normal salivary gland tissue as well as in pleomorphic adenoma. In normal salivary glands, alpha 1-ACT was localized to the intercalated duct and serous acinar cells. On the other hand, there was positive staining for alpha 1-AT in the intercalated and striated duct cells. Twenty-five cases (100%) of pleomorphic adenomas in children displayed positivity to alpha 1-ACT staining and 22 cases (88%) showed a positive staining for alpha 1-AT. alpha 1-ACT staining was particularly intense in chondrocyte-like cells of 20 cases (80%), in inner tubular cells of 16 (64%) and cyst-lining cells of 12 (52%). The limited number of tumor cells which were called plasmatoid or hyaline cells and squamous epithelial cells, were positive for alpha 1-ACT. None of the outer tubular cells and hyalinous material was positively stained for alpha 1-ACT. A strong positive reaction for alpha 1-AT was observed in chondrocyte-like cells of 15 cases (60%). Inner tubular cells were positive for alpha 1-AT in 12 cases (48%), plasmatoid or hyaline cells in 10 (40%) and cyst-lining cells in 8 (35%). Squamous epithelial cells, clear cells, secretory product and hyalinous material were positive for alpha 1-AT in some cases. Chondroid matrix and myxoid stroma had no reaction with both antibodies. The biological role of alpha 1-ACT and alpha 1-AT with a wide immunohistochemical distribution in pleomorphic adenomas of children may be associated with a self regulating mechanism which inhibits degradation by tissue proteinases.
 ...
PMID:Immunohistochemical demonstration of alpha 1-antichymotrypsin and alpha 1-antitrypsin in salivary gland pleomorphic adenomas of children. 170 38

Three odontogenic myxomas are described immunohistochemically by a panel of poly- and monoclonal antibodies to characterize this tumor type. Three types of odontogenic myxoma cells were discriminated: spindle cells, stellate cells and hyaline cells. Neoplastic cells of myxomas were positively stained for transferrin, ferritin, alpha-1-antichymotrypsin (alpha 1-ACT), alpha-1-antitrypsin (alpha 1-AT), S-100 protein and vimentin; however, neuron specific enolase (NSE), S-100 alpha subunit, S-100 beta subunit, Factor VIII-related antigen (FVIII-AG) and cytokeratin (CK1) were negative. Spindle cells were positive for transferrin, ferritin, alpha 1-ACT, alpha 1-AT, S-100 protein and vimentin. Stellate cells were strongly positive for transferrin, alpha 1-AT, S-100 protein and vimentin. Hyaline cells reacted with alpha 1-ACT and alpha 1-AT. Myxomatous matrix showed negative reaction for all the antibodies used. These results have confirmed that odontogenic myxoma is a tumor of a dual fibroblastic-histiocytic origin.
 ...
PMID:Immunohistochemical investigation in odontogenic myxoma. 203 72

The primary focus of this experiment was on the investigation of localizations of alpha 1-antitrypsin (alpha 1-AT), alpha 1-antichymotrypsin (alpha 1-ACT), fibronectin (FN) and lysozyme (LY) in tumor cells of experimental malignant fibrous histiocytoma (MFH). The induction of MFH was conducted by injecting Fischer 344 rats with 4-hydroxyaminoquinoline 1-oxide (4-HAQO). In 46 out of 50 rats, tumors were generated, all of which were diagnosed as MFH and classified into 5 subtypes, according to their histological properties. The presence of alpha 1-AT, alpha 1-ACT and FN in all MFH tumor cells was observed in the tumor cells of various types. Especially, fibroblast-like, histiocyte-like and Touton and/or Epulis type giant cells showed strong reactivity. However, positive reaction of LY in MHF tumor cells was very weak, or the reaction was negative. These findings are consistent with those of human MFH.
 ...
PMID:Immunohistochemical study of 4-hydroxyaminoquinoline 1-oxide-induced rat malignant fibrous histiocytoma. 215 61

Hepatoblastoma exhibits a wide range of epithelial and mesenchymal lines of differentiation. Neuroendocrine differentiation in this tumor has not previously been reported. We investigated seven hepatoblastomas of different subtypes (five pure epithelial hepatoblastomas, including one small-cell hepatoblastoma, and two mixed hepatoblastomas) using a broad panel of antibodies against epithelial, mesenchymal, neural, and neuroendocrine markers, alpha-1-antitrypsin (alpha 1-AT), alpha-1-antichymotrypsin (alpha 1-ACT), alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), serotonin, and 14 regulatory peptides. Chromogranin A-immunoreactive neuroendocrine tumor cells, some of which also exhibited immunoreactivity for serotonin and somatostatin, were found in the fetal and embryonal parts of the mixed hepatoblastomas. The osteoid-like material in the mixed hepatoblastomas contained cells with immunoreactivity for chromogranin A, neuron-specific enolase, keratin, and alpha 1-AT, alpha 1-ACT, AFP, and CEA, in addition to S-100 protein and vimentin. Parallels to the neuroendocrine differentiation in hepatoblastomas are found in tumors of the gastrointestinal tract and bronchopulmonary tree. These tumors may also exhibit a neuroendocrine component; that is, multidirectional differentiation may occur, as in hepatoblastoma. The immunoreactivity of some of the cells of the osteoid-like material for keratin, alpha 1-AT, alpha 1-ACT, AFP, CEA, and chromogranin A suggests that these cells--and probably the surrounding material--are of epithelial origin.
 ...
PMID:Neuroendocrine differentiation in hepatoblastoma. An immunohistochemical investigation. 216 15

Fifty-four adenoid cystic carcinomas (ACC) arising in major and minor salivary glands as well as in normal salivary glands were studied by immunohistochemistry for the presence of vimentin, neuron-specific enolase (NSE), alpha 1-antichymotrypsin (alpha 1-ACT) and alpha 1-antitrypsin (alpha 1-AT). Five patterns of histological differentiation were found in ACC, and for the cellular components of each, it was possible to establish a special immunohistochemical profile. In ACC, vimentin-positive cells were observed in the outer tubular, cyst-lining and small angular cells. NSE was positive in the myoepithelial cells of normal salivary gland. Neoplastic cells of ACC showed NSE positivity mainly in the small angular cells and partly in the duct luminal cells. alpha 1-ACT was localized in the intercalated duct cells and serous acinar cells of normal salivary gland, and in the duct luminal cells of ACC. alpha 1-AT could not be detected in any of the epithelial cells of normal salivary gland. In ACC, eosinophilic hyaline material in the cribriform spaces was positive for alpha 1-AT, but no positivity was demonstrated in tumor cells. The present study showed that there are at least two populations of tumor cells in ACC: duct luminal cells that express alpha 1-ACT, thus indicating their ductal character, and small angular cells that express vimentin, characteristic of non-luminal cells. Moreover, our results indicate that alpha 1-AT is a useful marker of basement membrane-like material.
 ...
PMID:Immunohistochemical investigation of vimentin, neuron-specific enolase, alpha 1-antichymotrypsin and alpha 1-antitrypsin in adenoid cystic carcinoma of the salivary gland. 217 37

The growth of the majority of prostate tumors is androgen-dependent, for which the presence of a functional androgen receptor is a prerequisite. Tumor growth can be inhibited by blockade of androgen receptor action. However, this inhibition is transient. To study the role of the androgen receptor in androgen-dependent and androgen-independent prostate tumor cell growth, androgen receptor mRNA expression was monitored in six different human prostate tumor cell lines and tumors, which were grown either in vitro or by transplantation on (male) nude mice. Androgen receptor mRNA was clearly detectable in three androgen-dependent (sensitive) tumors and absent or low in three androgen-independent tumors. Growth of the LNCaP prostate tumor cell line can be stimulated both by androgens and by fetal calf serum. In the former situation androgen receptor mRNA expression is downregulated, whereas in the latter no effect on androgen receptor mRNA levels can be demonstrated. Sequence analysis showed that the androgen receptor gene from LNCaP cells contains a point mutation in the region encoding the steroid-binding domain, which confers an ACT codon encoding a threonine residue to GCT, encoding alanine.
 ...
PMID:The androgen receptor: functional structure and expression in transplanted human prostate tumors and prostate tumor cell lines. 228 96

The role of carcinoembryonic antigen (CEA), gamma glutamyl transpeptidase (gamma GT), phosphohexose isomerase (PHI), pseudouridine (PSD) and acute phase reactant proteins (C-reactive protein (C-RP], alpha 1-acid glycoprotein (alpha 1-AGP) and alpha 1-antichymotrypsin (alpha 1-ACT) in distinguishing benign from malignant conditions of the digestive tract and their value in assessing the prognosis of gastrointestinal neoplasms was evaluated. For each marker it has been possible to produce a simple scoring index derived from the values found in the control population. This work suggests that pre-operative levels of certain cancer markers may be useful in tumor detection and may also give prognostic information additional to pathological staging.
 ...
PMID:[Combination of cancer markers in the detection and prognosis of digestive system tumors]. 244 53

Malignant fibrous histiocytoma was found in the left heart atrium as well as in probable secondaries in stomach, intestine, calvaria and diaphysis of femur. Tumour cells possessed electron microscopical features and markers of fibroblasts and histiocytes (immunopositivity with lysozyme,i A1 AT and A1 ACT).
 ...
PMID:[Malignant fibrous histiocytoma of the left atrium of the heart]. 254 59


1 2 3 4 5 6 7 8 9 10 Next >>