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Several mechanisms of drug resistance have been defined using cell lines selected for resistance in vitro. However, the relevance of these to tumor cell resistance in vivo remains unclear. We established tumor cell lines from biopsies of human sarcomas before and after doxorubicin therapy. One
A drop of glutathione peroxidase and glutathione reductase activity was revealed in sarcoma C-45 at the period of its most intensive growth. Repeated sarcolysine injections (1.2 mg/kg, intraperitoneally) caused a sharp fall in the activity of both enzymes with a simultaneous reduction of the ratio
To analyze the purportedly epithelial features of synovial sarcoma, the antigenic profiles of 20 of these neoplasms (including 12 of the monophasic type) were studied by three different immunohistochemical techniques, and the results were correlated with ultrastructural observations in 10 cases. All
Glutathione (GSH) metabolism and protein synthesis were observed over a period of about two weeks in Yoshida ascites sarcoma and intracellular concentration relative to days 7, 10 and 13 assumed as 'markers' of different stages of tumor development. During this period the decrease in rate of cell
Some cytochemical and immunocytochemical investigations were carried out on actively growing Yoshida ascites sarcoma cells. These cells displayed an intense granular alpha-naphthylacetate esterase (ANAE) staining while the alpha-naphthylbutyrate esterase (ANBE) reaction was in part
A 43-yr-old Japanese woman presented with mild anemia, leukocytosis and splenomegaly in May 1984. Splenomegaly and anemia gradually progressed. Sixteen years later, in October 2000, she developed inguinal lymphadenopathy. Biopsy of the lymph node revealed infiltration of blasts, megakaryocytes,
Five out of eight consecutive cases with initial symptoms of a 'midline granuloma' were identified as malignant histiocytosis (histiocytic sarcoma) which within 5 months to 4 years led to generalization and death. The three remaining cases also fulfilled the morphological criteria of this type of
We have studied the effect of selenium on the expression of a cellular glutathione peroxidase, GSHPx-1, in transfected MCF-7 cells and in doxorubicin-resistant (Adrr) MCF-7 cells. A GSHPx-1 cDNA with a Rous Sarcoma virus promoter was transfected into a human mammary carcinoma cell line, MCF-7, which
The low curative response to current treatment regimens for most soft tissue sarcomas indicates a strong need for alternative treatment strategies and predictive markers for treatment outcome. PCI (photochemical internalization) is a novel treatment strategy to translocate drugs into cytosol that
To determine whether occult eosinophil degranulation occurs in lymphomas, the authors performed immunohistologic and cytochemical studies on cryostat sections from 25 consecutive lymph node biopsies. A glucose-oxidase immunohistochemical technique was employed with a murine monoclonal antibody
Avidin, a high-affinity biotin-binding protein of chicken oviduct, was recently found to be synthesized and secreted by damaged or virus-transformed chicken embryo fibroblasts and by chicken macrophages. We have now localized avidin in fibroblasts that were transformed by Rous sarcoma virus. The
The diagnostic and prognostic relevance of desmin expression in 80 rhabdomyosarcomas (RMS) and 5 embryonal sarcomas (ES) was examined using a peroxidase anti-peroxidase staining procedure. Fifty-nine RMS but only one ES stained for desmin (P less than 0.05). The maximum percentage of desmin
Granulocytic sarcoma rarely presents an effusion. We have described an unusual case of granulocytic sarcoma with ascites. Malignant cells may be confused with adenocarcinoma. Eosinophilic myelocytes, peroxidase-positive malignant cells, and the Philadelphia chromosome in the ascitic fluid cells