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  • Electron microscopy  (3)
  • Multidrug resistance  (2)
  • (Sub)periosteal  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Biologic characterization of human bone tumors (1983)
    Springer
    Journal of cancer research and clinical oncology 106 (1983), S. 234-239 
    Details
    ISSN: 1432-1335
    Keywords: Osteosarcoma ; Collagen types ; Immunofluorescence microscopy ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Sixteen cases of typical highly malignant osteosarcoma were investigated by light, electron, and immunofluorescence microscopy to demonstrate the presence of collagen types I–III. It was shown that, in light-microscopically anaplastic areas of the tumor, collagen type III predominates, while only very few membranes of collagen type I are observed. Ultrastructurally, the cells are characterized by numerous free ribosomes in their cytoplasm and only a few membranes of granular endoplasmic reticulum (ER). In osteoblastic areas, collagen type I is increased, while type-III collagen is decreased. The cytoplasm of cells contains markedly more granular ER. An increasing mineralization of matrix is observed. In fibroblastic areas of the tumors, collagen types I and III are codistributed. Tumor cells have a fibroblast appearance with elongated nuclei and well developed granular ER. The chondroblastic areas, characterized by immature neoplastic cartilage, contain varying amounts of collagen type II. Chondroblast-like tumor cells have typical ring-shaped membranes of granular ER in their cytoplasm. The evidence of different collagen types in osteosarcomas lends additional support to the concept that a pluripotent mesenchymal cell is the stem cell of osteosarcomas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402614
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  • 2
    Electronic Resource
    Electronic Resource
    Expression of MDR1/p-glycoprotein and multidrug resistance-associated protein in childhood solid tumours (1997)
    Springer
    Virchows Archiv 430 (1997), S. 99-105 
    Details
    ISSN: 1432-2307
    Keywords: Multidrug resistance ; P-glycoprotein Neuroblastoma ; Nephroblastoma ; Reverse transcriptase polymerase chain reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We evaluated the expression of MDR1/p-glycoprotein in paediatric tumours using reverse transcriptase polymerase chain reaction (RT-PCR), RNA dot blot analysis, and immunohistochemistry on formalin fixed paraffin-embedded material with JSB-1 and C-219 monoclonal antibodies, and compared these three techniques. The expression of multidrug resistance-associated protein (MRP) gene was examined by RT-PCR assay. We studied MDR1/p-glycoprotein and MRP expression in 13 samples from 10 neuroblastoma patients, 11 samples from 10 nephroblastoma patients, 2 rhabdomyosarcomas, 1 adrenocortical carcinoma and 10 benign tumours or tumour-like lesions. Eleven of 13 neuroblastomas, 7 of 11 nephroblastomas, 2 rhabdomyosarcomas, 1 adrenocortical carcinoma, and 7 of 10 benign tumours or tumour-like lesions showed MDR1 PCR products. By RNA dot blot analysis, MDR1 transcripts were detectable in 11 of 34 specimens. Immunohistochemically, we detected positive reaction products for JSB-1 in 26 of 36 samples. There was a significant correlation between the immunoreactivity for JSB-1 and the expression of MDR1 mRNA expression by RTPCR (P=0.0001). However, the presence of p-glycoprotein immunostaining does not correlate with the MDR1 expression shown by RT-PCR in every case. As for MRP mRNA expression, 9 of 13 neuroblastomas and 10 of 11 nephroblastomas revealed PCR products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008030
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of telangiectatic osteosarcoma (1979)
    Springer
    Journal of cancer research and clinical oncology 95 (1979), S. 197-207 
    Details
    ISSN: 1432-1335
    Keywords: Telangiectatic osteosarcoma ; Histogenesis ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Recent investigations have shown that telangiectatic osteosarcoma has a poorer prognosis than other osteosarcomas. To elucidate the histogenesis of TOS two cases were investigated on the electron microscopic level. The results show that besides anaplastic, osteoblast-like, and fibroblast-like tumor cells angiosarcomatous components can be observed in this malignant bone tumor, which are characterized by endothelial cells with pinocytotic vesicles, tight intercellular junctions, fine fibrils, and so-called Weibel-Palade bodies in their cytoplasm. From these results, it is concluded that telangiectatic osteosarcoma is derived from multipotent mesenchymal cells with potential differentiation into various directions, such as osteoblast-like cells, endothelial cells, and fibroblast-like cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401013
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  • 4
    Electronic Resource
    Electronic Resource
    (Sub)periosteal Ewing's sarcoma of bone (1992)
    Springer
    Journal of cancer research and clinical oncology 118 (1992), S. 72-74 
    Details
    ISSN: 1432-1335
    Keywords: Ewing's sarcoma ; (Sub)periosteal ; Differential diagnosis ; Prognostic factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Ewing's sarcoma is a small malignant round-cell tumour that arises from mesenchymal cells, predominantly in the medullary cavity of bone. In exceptional cases it originates in the soft tissues and subsequently invades the underlying bone. A (sub)periosteal origin of Ewing's sarcoma is a very rare condition: only a few cases have been published so far. Three cases of (sub)periosteal Ewing's sarcoma, having received neoadjuvant chemotherapy and radiation therapy as well as wide excision, are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01192315
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  • 5
    Electronic Resource
    Electronic Resource
    Prognostic implication of immunodetection of P glycoprotein in Ewing's sarcoma (1993)
    Springer
    Journal of cancer research and clinical oncology 119 (1993), S. 185-189 
    Details
    ISSN: 1432-1335
    Keywords: P glycoprotein ; Ewing's sarcoma ; Multidrug resistance ; Prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Increased expression of P glycoprotein is associated with multidrug resistance in many cell lines. P glycoprotein has been detected in different human tumors. To assess the implication of multidrug resistance in the prognosis of Ewing's sarcoma the expression of P glycoprotein was studied immunohistochemically in pre- and post-therapeutic tumor tissues of 21 cases treated according to the CESS 81 or 86 protocol. The response to chemotherapy was evaluated histologically. Formalin-fixed, paraffin-embedded and fresh frozen sections were immunostained with a monoclonal antibody to P glycoprotein, clone JSB 1, using the double APAAP method. P glycoprotein was detected in 12 cases of 21 (57%) in either pre- or postchemotherapy tumor tissues. From the 21 cases 8 revealed a good morphological response to chemotherapy (33%); 10 of the 13 non-responders were positive for P glycoprotein (77%), but only 2 of the 8 responders (25%). The difference was statistically significant (P〈0.05). Comparing P glycoprotein expression with the clinical outcome, we found that 7 of 12 positive cases had died (58%). From the negative cases only 3 of 9 had died (33%). However, judged by the the Kaplan Meyer life tables, these data were not significant. In conclusion our results suggest that the immunodetection of P glycoprotein indicates a poor response to chemotherapy and probably a bad clinical outcome for Ewing's sarcoma patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01624429
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  • 6
    Electronic Resource
    Electronic Resource
    Biologic characterization of human bone tumors I. Ewing's sarcoma (1982)
    Springer
    Journal of cancer research and clinical oncology 104 (1982), S. 171-180 
    Details
    ISSN: 1432-1335
    Keywords: Ewing's sarcoma ; Type IV collagen ; Factor-VIII-associated protein ; Endothelial differentiation ; Electron microscopy ; Immunofluorescence microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Six cases of Ewing's sarcoma were investigated by electron and immunofluorescence microscopy. A layer of basement membrane-like deposits was found between typical principal and secondary tumor cells. To clarify the nature of these ultrastructural deposits, antibodies against collagen type IV were applied to frozen sections of corresponding tumor tissue. This reaction revealed type IV collagen as a regular component of basement membranes in nonneoplastic tumor capillaries, but it was equally able to localize collagen type IV between single tumor cells in capillary-free areas. With the same method, factor-VIII-associated protein, predominantly found in endothelial cells, could be demonstrated in some tumor cells. These results demonstrate that, in addition to anaplastic cells, some tumor cells are found in Ewing's sarcoma that share certain differentiating features with the endothelial cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402065
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