Biomedical subjects

F Andrei

Publications and source records attributed to F Andrei.

4 recordsLinked to original sources

PubMed2005

Uncommon pattern in soft tissues epithelioid sarcoma.

UNLABELLED: Epithelioid sarcoma (ES) is a rare tumor, but extremely versatile, simulating easily both clinically and morphologically multiple benign lesions as granulomas and malignant tumors as achromic melanomas or carcinomas. Especially the histological aspects are suggesting for an epithelial tumor. The atypical biological behavior of tumor is conferred by: a propensity for lymph nodes metastases, large dimensions of tumor, unusual localizations. AIM: To report some peculiar histological and immunophenotypic aspects in soft parts epithelioid sarcoma. MATERIALS AND METHODS: We analyzed retrospectively three cases of epithelioid sarcomas with unusual clinico-morphological (large dimensions), histopathological (absence of necrosis) and immunohistochemical (IHC) patterns selected from 200 consecutive soft parts malignant tumors of "Victor Babeş" National Institute Bucharest files. For the immunohistochemical (IHC) staining, the following antibodies were used: vimentin, EMA, cytokeratins (KL1, CK19), S-100 protein, CD68, p53 protein, vascular markers (CD31, CD34, FVIII-related antigen), HMB45, MELAN A. RESULTS: The tumors had unusually large dimensions, the absence of necrosis, a vaguely alveolar pattern; the IHC staining showed a strong positivity of S-100 protein, a variable expression of cytokeratins KL1 and CK19, in association to a scarce positivity for EMA, zonal positivity for CD34 and diffuse reaction for vimentin. CONCLUSION: The immunophenotype of ES may have a large variability and the correlation to clinico-morphological aspects is necessary for a good diagnostic assessment.

Adult↗

PubMedDate not supplied

Snapshots of mammary gland interstitial cells: methylene-blue vital staining and c-kit immunopositivity.

We show here that methylene-blue supravital staining of specimens from normal human mammary gland reveals (selectively) interstitial (stromal) cells, with 2-3 long (20-80 microm), thin, moniliform processes. Such cells appear c-kit/CD117 positive, either by immunohistochemistry (IHC) or immunofluorescence (IF). Since these features (affinity for methylene blue, c-kit positivity, and characteristic processes) define archetypal interstitial cells of Cajal (ICC) in light microscopy, our results suggest the existence of Cajal-like cells in the interstitium of human normal mammary gland.

Cell Surface Extensions↗

PubMedDate not supplied

Cajal-type cells from human mammary gland stroma: phenotype characteristics in cell culture.

We report here the in vitro isolation of Cajal-like interstitial cells from human inactive mammary-gland stroma. Primary cell cultures examined in phase-contrast microscopy or after vital methylene-blue staining revealed a cell population with characteristic morphological phenotype: fusiform, triangular or polygonal cell body and the corresponding (very) long, slender, moniliform cytoplasmic processes. Giemsa staining pointed out the typical knobbed aspect of cell prolongations. Immunofluorescence (IF) showed, like in situ immunohistochemistry, that Cajal-type cells in vitro (primary cultures), expressed c-kit/CD117 and vimentin. In conclusion, the images presented here reinforce our previous hypothesis that human mammary glands have a distinct population of Cajal-like cells in non-epithelial tissue compartments.

Breast↗

PubMedDate not supplied

Cellular immune response in atypical tuberculosis diagnosed by PCR in paraffin embedded material.

The aim was to evaluate the cellular immune response in atypical tuberculosis and granulomatous inflammation consistent with tuberculosis (TBC), negative histochemically for acid-fast bacilli and analysed by PCR for Mycobacterium tuberculosis (MT) detection in paraffin-embedded tissue. Thirty six samples of differently localized atypical tuberculous lesions and granulomatous tuberculoid lesions negative for acid fast bacilli and 4 positive cases on Ziehl-Nielsen stain were analysed by PCR for MT detection and were tested immunohistochemically (IHC) for the cellular immune response in the granulomas and perigranulomatous tissue. The samples selected were: 7 pulmonary and 33 extrapulmonary specimens, especially lymph nodes. Histologically, the atypical tuberculous lesions contained supurative necrosis, defective granulomas and cellular polymorphism. The epithelioid cells showed frequent mitoses. The immunoprofile of cells was polymorphous. L26 positive small lymphocytes were found in nodular lymphoid aggregates surrounding granulomas. A significantly increased number of positive UCHL1 cells were found in 33 out of the 40 analysed cases, with a larger percentage of CD4 positive T cells (81.8% of cases). CD44 was positive in multinucleated giant cells (17.5% of cases), epithelioid cells (60% of cases) and lymphocytes (30% of cases). CD68 was localized in multinucleated giant cells and epithelioid cells, in a 4%, respectively 62.5% of cases. The PCR was performed in all 40 cases; the tissue samples were heterogeneous (lung, lymph nodes, lever, nasopharynx, etc.) and needed a good quality extraction of DNA. Performing a control PCR for Beta Globin tested the extraction; a good result was obtained in 31 cases (77.5%); from these, 19 cases had amplification for IS 6110. The cellular immune response in the atypical tuberculous lesions was similar in cases with and without acid-fast bacilli, but positive for PCR. In the most cases with negative PCR reaction, it was due to a deficient fixation of the material. The T lymphocytes were numerous in all types of tuberculous granulomas, with the prominence of CD4 positive subtype. The immunoprofile of the epithelioid cells, positive for CD44 and CD68, presenting frequently mitoses suggests an activate state in a possible relationship to the T-cell-mediated immune response in tuberculosis.

Antigens, CD↗