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Biomedical subjects

G Fabris

Publications and source records attributed to G Fabris.

At least 55 records · Page 3Linked to original sources
PubMed1988

Expression of p21 ras gene products in breast cancer relates to histological types and to receptor and nodal status.

Expression of the p21 product of the ras gene family was investigated in a series of 142 infiltrating primary breast tumors by two specific ras p21 monoclonal antibodies with an immunocytochemical technique. The majority of tumors demonstrated a varying number of positive cells. A significant association between p21 expression and tumor histotype was found: among ductal carcinomas the comedo variety was always positive; conversely, lobular tumors were more frequently negative. Nodal status was recorded for all patients. A significant difference was found in nodal status with respect to p21 expression: tumors with more than 50% positive cells were more often N+. Estrogen receptor (ER) status was determined in 77 tumors. Tumors with higher levels of p21 contained a high percentage of estrogen receptor positive cells. The present results show that p21 expression in human breast cancer could be a marker of tumor aggressiveness and might thus improve the predictive power of known prognostic factors such as estrogen receptor and nodal status.

Breast Neoplasms↗
PubMed1987

Immunocytochemical demonstration of estrogen receptors by monoclonal antibodies in human breast cancer: correlation with estrogen receptor assay by dextran-coated charcoal method.

Immunocytochemical demonstration of estrogen receptors in 115 human breast cancer specimens was performed using mouse monoclonal antibodies against estrogen receptor and avidin-biotin as the displaying system. The antibody indicated a highly heterogeneous endowment of neoplastic cells with estrogen receptor at both nuclear and cytoplasmic levels. The percentage of labeled cells within each tumor specimen was recorded to compare this immunocytochemical assay with the biochemical assay of estrogen receptors by the dextran-coated charcoal method. A significant correlation was observed between these two assays. The present results show that estrogen receptors can be confidently demonstrated at the single cell level, thus providing additional information to quantitative biochemical assays. Their prognostic and therapeutic predictive powers may be usefully integrated, particularly in view of the heterogeneous distribution of receptors among cancer cells.

Antibodies, Monoclonal↗
PubMed1987

Pathophysiology of estrogen receptors in mammary tissue by monoclonal antibodies.

Identification of preneoplastic lesions of the breast has mainly rested on morphological grounds, supported by epidemiological data. These studies assign a definite precancerous potential to a group of atypical hyperplastic lesions and in situ carcinoma. In spite of much effort no criteria are yet available to understand which, among these lesions, is committed to infiltrative growth, in other words, to understand the risk to a single patient. Estrogens are know to play a critical role in the etiology of breast cancer. The hypothesis is investigated that this role is dependent on a modified expression of their receptor. To approach this question estrogen receptor expression was traced by specific monoclonal anti-receptor antibodies and immunocytochemistry, on a spectrum of breast tissue changes, from normal tissue to infiltrating cancer. Estrogen receptor expression is heterogeneous in normal tissue and in infiltrating cancer, and on the contrary is homogeneous in proliferative atypical lesions and in in situ carcinomas. Present results show that receptor expression is enhanced and becomes homogeneous, maybe constitutive, in atypical hyperplasia and in in situ carcinoma and that this phenomenon could subserve important changes of proliferative capacity which are necessary and possibly sufficient for autonomous growth.

Breast↗
PubMed1985

A monoclonal antibody to human transitional-cell carcinoma of the bladder cross-reacting with a differentiation antigen of neutrophilic lineage.

A monoclonal antibody (MAb) to human transitional-cell carcinoma of the bladder (TCCB) was obtained by immunization of a BALB/c mouse with formalin-fixed TCCB cells and subsequent fusion of the spleen cells with SP2-OAg14 myeloma line. GF 26.7.3 MAb was selected by indirect immunofluorescence (IIF) as reacting agent with target cells and negative with autologous lymphocytes and Epstein-Barr virus (EBV)-transformed lymphoblastoid cell-line. GF 26.7.3 reacts with a high percentage of bladder and colon carcinomas when examined by IIF and immunoperoxidase techniques and cross-reacts with a determinant expressed on neutrophilic cell lineage. The IIF analysis performed on bone marrow and peripheral blood (PB) from healthy subjects and leukemic patients and on leukemic cell lines showed that the expression of the structure detected by GF 26.7.3 is restricted to the neutrophilic cell lineage and first expressed at the promyelocytic level. Immunoprecipitation and SDS-polyacrylamide gel electrophoresis (PAGE) of 125 I-labelled membrane proteins from target cells were performed, but no bands were detected by autoradiography. In addition, pronase insensitivity and periodate sensitivity suggest the possible involvement of a carbohydrate determinant.

Antibodies, Monoclonal↗
PubMed1985

Prognostic correlations of operable carcinoma of the rectum.

Various histologic factors correlated to survival were studied in 124 patients radically operated on for rectal carcinoma in order to establish valid prognostic criteria. The total survival rate after five years was 63 percent, while in stage B1 it was 89 percent, in B2, 61 percent, and in C1, 47 percent (P less than 0.05). With regard to histotype, the survival was 83 percent in the papillary subtype of adenocarcinoma, while in the tubular subtype it was 62 percent, and 29 percent in the mucinous type (P = not significant). Vascular invasion negatively affected survival (41 percent); however, when there was no invasion, the prognosis was better (71 percent) (P less than 0.01). In evaluating histologic grading and lymphoglandular reactivity, the difference in survival rates was not statistically significant. The marked peri- and intratumoral lymphocytic infiltration gave a very good prognosis (92 percent) contrary to when reactivity was moderate (59 percent) or even absent (51 percent) (P less than 0.01). Finally, the expanding type tumor, with reference to Ming's classification of gastric carcinoma, had a much better prognosis (75 per cent) than the infiltrative type (40 percent) (P less than 0.01).

Adenocarcinoma↗
PubMed1983

BK virus-induced tumors in hamsters: a morphological, histochemical and ultrastructural study.

Macroscopic morphology, histology and ultrastructure of BK virus (BKV)-induced hamster and mouse tumors were investigated. Groups of animals were immunosuppressed to study the relationship between immune system and BKV oncogenesis. Ependymomas had the highest incidence, followed by tumors of pancreatic islets, osteosarcomas, lymphomas and sarcomas, sometimes associated in the same animal. All the tumors were found to be BKV specific. Ependymomas showed the shortest latency, infiltrated surrounding tissues but did not metastasize. Pseudo-rosettes were common and basal bodies were observed. Atypia and necrosis were more often present in immunosuppressed animals both for the ependymomas and for the other oncotypes. Pancreatic insulomas were frequently multinodular, possibly because of multifocal origin and metastasized to the liver. Hormone secretory granules were often found on electron microscopy. Osteosarcomas metastasized to lungs and peritoneum and showed the presence of osteoid, chondroblastoid and mixoid areas. Characteristic giant cells were present. Immunosuppression did not enhance tumor incidence and did not influence the latency period. However, neoplastic growth appeared to be more rapid and with more aggressive behavior in immunodepressed animals. These findings suggest an influence of the immune system in tumor development, whereas the virus oncogenic process seems unaffected.

Animals↗
PubMed1980

Intracellular flow of particulate steroid-receptor complexes in steroid target cells.

The structural expression of nuclear transportation of receptor-bound oestradiol was investigated by immunoelectron microscopy on human breast cancer cells. In oestradiol-treated cells during transportation, oestradiol antibodies attached to cytoplasmic oestradiol-bearing particles which seemed to interact with the nuclear membrane. These particles, subserving the intracellular flow of steroid-receptor complexes, could constitute a special cellular system of macromolecular transport, communication and compartmentalisation.

Antibodies↗
PubMed1980

Estrogen receptor cytochemistry by fluorescent estrogen.

A recently synthesized fluorescein-labeled estrogen (17FE, 1-(N)-fluoresceinyl-estrone-thiosemicarbazone) interacts with estrogen-target cells like the native hormone and visualizes the uptake, transport, and distribution of estrogen in intact target cells. Moreover, estrogen binding sites are traced by 17FE in cryostat sections of estrogen target tissues as well. Cell and tissue 17FE binding sites fulfill the accepted criteria for specific estrogen receptors (finite binding capacity, high affinity, steroid and tissue specificity). This fluorescent probe allows estrogen receptors to be studied in a wide variety of cell and tissue preparations under varying conditions of physiologic and pathophysiologic interest.

Animals↗
PubMed1979

[Value and limitations of exfoliative cytological study of the pancreatico-duodenal juice collected during the secretin and pancreozymin test in the diagnosis of pancreatic carcinoma].

Studies on exfoliative cytology of the pancreatic-duodenal juice in the diagnosis of pancreas neoplasia are not numerous and the data reported are not uniform. The present study examines 176 patients, 18 of them suffering from carcinoma of the pancreas. In these latter patients there were no advanced signs of the disease. Cytology gave a correctly negative result in 46.8% of the normal subjects and in those with non-neoplastic pancreatic or digestive conditions, correctly positive in 66.6% of the pancreas neoplasias, falsely negative in 2,2% of the total series and in 33.3% of the pancreatic cancers, and falsely positive in 1,1% of the series. In 47.7% of cases, the study proved useless owing to the absence of material in the collected juice.

Cholecystokinin↗