Search results for "Chromophobe cell"

Human chromophobe cell renal carcinoma

1985

Twelve renal cell carcinomas composed of "chromophobe" cells are described. This is the first report of renal chromophobe cell tumors in humans neoplasms of this cell type having been described previously only in experimentally induced adenomas in animals. By light microscopy chromophobe cells have slightly opaque or finely reticular cytoplasm when stained with haematoxylin and eosin. They may be distinguished from the clear cells of hypernephroid renal cell carcinomas by the strongly positive reaction of their cytoplasm with Hale's (1946) colloidal iron method and the weaker positive reaction with alcian blue. Vesicular structures, often containing internal vesicles, and possibly derived f…

Chromophobe cell renal carcinoma and its variants--a report on 32 cases.

1988

This paper reports on 32 chromophobe cell renal carcinomas observed in 697 renal cell cancers (RCC) of adults (peak in the sixth decade of life). The chromophobe cell-type differs from other types of RCC macroscopically, the cut-surface being predominantly of grey-beige colour. Histologically, there are two variants: one is the typical (light) variant (n = 22) and the other is eosinophilic (n = 10). Both variants have in common (a) reaction of the cytoplasm with Hale's acid iron colloid; (b) electron microscopic detection of cytoplasmic microvesicles (150-300 nm), frequently with 'inner vesicles', and (c) low glycogen content in comparison with the clear cell carcinoma. Immunocytochemical i…

Low frequency of HLA haplotype loss associated with loss of heterozygocity in chromosome region 6p21 in clear renal cell carcinomas.

2004

HLA class I loss or downregulation is a widespread mechanism used by tumor cells to avoid tumor recognition by cytotoxic T lymphocytes favoring tumor immune escape. Multiple molecular mechanisms are responsible for these altered HLA class I tumor phenotypes. It has been described in different epithelial tumors that loss of heterozygosity (LOH) at chromosome region 6p21.3 is a frequent mechanism that leads to HLA haplotype loss, ranging between 40 and 50%, depending on the tumor entity analyzed. Here we have tested the frequency of LOH at 6p21 chromosome region in Renal Cell Carcinomas (RCC) of the clear cell and chromophobe subtype. A low frequency of HLA haplotype loss (6.6%) was found in …

Klassifikation der Nierenzellkarzinome/Tumoren und ihre Beziehung zum Nephron-Sammelrohrsystem

1990

After a controversial phase of nomenclature (including--among others--the terms "hypernephroma" and "hypernephroid carcinoma") a cytomorphologically defined subtyping of renal cell tumours (adenomas, carcinomas, oncocytomas) is offered, based on new electron microscopical and histochemical observations. These data are in part supported by cytogenetical findings reported in the literature. Phenotypical/histogenetical relations to different parts or cell types, respectively, of the nephron-collecting duct system could be demonstrated. Chromophobe cell carcinoma and oncocytoma exhibit features of the intercalated cells.

Histopathology and Classification of Renal Cell Tumors (Adenomas, Oncocytomas and Carcinomas)

1986

The term renal cell tumors (adenomas and carcinomas) subsumes the tumors deriving from the uriniferous tubule epithelium of the kidney. Precise analysis shows that the renal cell tumors display different cell types which build up the individual tumor alone or in combination with each other. Three categories of basic elements are distinguished in the characterization of renal cell tumors: Cytological elements = tumor cell types: Clear, chromophobe, chromophilic (basophilic, eosinophilic), oncocytic, spindle-shaped/pleomorphic. Histological elements = growth patterns: Compact, acinar (nest-like), tubulopapillary (tubular, papillary), cystic. Cytological grading of malignancy: G I, G II, G III…

Cytoplasmic microvesicles in chromophobe cell renal carcinoma demonstrated by freeze fracture

1987

In the chromophobe cell type of renal carcinoma, cytoplasmic microvesicles (frequently with "inner vesicles") demonstrable by transmission electron microscopy are one of the most important diagnostic features. The present paper reports on these microvesicles in freeze fracture replicas. Their diameter is mainly between 140 and 300 micron, but smaller and very much larger vesicles may also occur. The vesicle membrane is devoid of, or contains only scanty intramembranous particles. Cytoplasmic invaginations, probably the precursors of "inner vesicles" can also be detected. Connections with the agranular endoplasmic reticulum, mitochondria or other cell components could not be documented. Larg…

Die Bestimmung von Wachstumshormon (HGH) als Diagnosticum bei chromophoben und eosinophilen Adenomen der Hypophyse

1971

Der Wert der radioimmunologischen Bestimmung von Wachstumshormon (HGH) in der praoperativen Diagnostik von chromophoben und eosinophilen Adenomen der Hypophyse wird an 27 Fallen demonstriert. Als Funktionstest wird die Insulin-induzierte Hypoglykamie angewandt. Eine einfache Maszahl (FHGH) zur Auswertung der Ergebnisse wird vorgeschlagen, die durch Integration der Flachen unter den HGH-Kurven erhalten wird. Als indirekte Testverfahren zur Uberprufung der Hypophysenfunktion dienen ein Metopiron- und ein ACTH-Test.

MP-02.13 Oncological Long-Term Outcome of Patients Presenting With Chromophobe in Comparison to Non-chromophobe Renal Cell Carcinoma

2011

Fortschreitender, einseitiger Visusverlust mit wechselnden unspezifischen Gesichtsfeldbefunden

1997

The human chromophobe cell renal carcinoma: its probable relation to intercalated cells of the collecting duct.

1988

In the present study we have examined ten cases of the chromophobe type renal cell carcinoma. This type of tumor is distinguished from the other carcinomas of the kidney with light cytoplasm (formerly called “hypernephroid”) by (a) a positive Hale’s iron colloid stain of the cytoplasm, (b) the occurrence of numerous invaginated vesicles within the cytoplasm that resemble the invaginated vesicles of intercalated cells of the collecting duct system, and (c) a positive immunoreaction of both the plasma membrane and the cytoplasm with antibodies to the epithelial membrane antigen (EMA) and carbonic anhydrase C (CAC), respectively. Unlike oncocytomas, which also express CAC and EMA, the chromoph…