0000000000185988
AUTHOR
Luisa Morell-quadreny
Chromophobe Renal Cell Carcinoma
SUMMARY A case ofchromophobe renal cell carcinoma is reported in a 73 year-old man. Light microscopically, the tumor was composed of polygonal cells with a slightly eosinophilic and a fine reticular pattern, and a reaction of the cytoplasm with Hale's acid iron colloid. Ultrastructural analysis showed membranous microuesicles within the tumor cells, with degenerated mitochondria. Immunohistochemical profile against intermediate filaments was positive to cytokeratin 18 and negative against uimentin. Flow cytometry and cytogenetics revealed a predominant bypertriploid population. Few cases have been published with flow cytometry and cytogenetic findings. We report a new case.
Cytogenetic analysis of three primary Bellini duct carcinomas.
Three Bellini duct carcinomas (BDC) of the kidney were cytogenetically analyzed after short-term culture. All three had clonal chromosome abnormalities: 91-92,XXY,-Y, +12, +12, -15, -16, -18, +mar (case 1); 53,XY, +2,t(2;7)(p22;q11), +der (2)t (2;7)(p22;q11), +3, +r(3),add(5)(p15), +7, -8, +12, +17, +r(17), +20, -21 (case 2); and 44-47,X,-Y, +9, +16, -21/46,XY. Some of the numerical abnormalities are shared with papillary renal cell carcinomas (PRCC)(+7, +12, +16, +17, and +20) but not with transitional renal cell carcinomas. The present findings support the previous notion that BDC are different from other types of RCC.
A singular case of near-haploid stemline karyotype in a renal oncocytoma.
Cytogenetic analysis of a human renal oncocytoma revealed a near-haploid chromosome number of 36 with the loss of chromosomes 1, 2, 3, 6, 8, 9, 15, 17, 21, and 22. Review of the literature disclosed that this cytogenetic configuration is extremely rare in solid human tumors and that no renal oncocytomas with near-haploid stemline karyotype have been described. These results are compared with the other published cases of oncocytoma.
Renal Oncocytomas (Typical and Atypical Variants): A Pathologic, Immunohistochemical, Morphometric, and Flow Cytometric Differential Study of 14 Cases With Cytogenetic Support
Eight conventional and six atypical oncocytomas in a series of 147 renal neoplasms were studied. Histopathologic findings revealed exclusively oncocytic cells, but cellular polymorphism was higher in the atypical tumors. Atypical oncocytomas presented focal necrosis, transcapsular invasion, or both. Electron microscopy showed similar findings in all cases. Immunohistochemistry of atypical oncocytomas had higher expression against proliferating cell nuclear antigen and more discontinuous immunostaining against laminin than typical ones. Flow cytometry revealed one or two aneuploid peaks in five typical and two atypical cases, although the latter had a higher proliferative fraction than typi…
P16INK4A and p15INK4B gene alteration associated with oxidative stress in renal cell carcinomas after the chernobyl accident (pilot study).
Our study was undertaken to better understand the role of G1/S transition abnormalities in the malignant progression of renal cell carcinomas (RCCs), exposed to long-term low doses of ionizing radiation (IR), from patients living in radiocontaminated areas of the Ukraine after the Chernobyl accident. We studied p16 and p15 gene alteration in association with oxidative stress markers, including inducible nitric oxide synthase (iNOS) and cyclooxygenase 2 (COX2). We analyzed 88 samples collected from 22 patients with RCCs and with different exposure to IR. Homozygous deletion of the p16 and p15 genes, as well as hypermethylation of the 5CpG island in the promoter region of the same genes, were…