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At least 1,621 records · Page 90Linked to original sources

PubMed1976

Certain aspects of the use of new method of microscopy in oncology.

Electron microscopic studies on human neoplasms demonstrated that the typical cells fo individual neoplasms retain the ability of showing their specific ultrastructural differentiation. This fact provides theoretical basis for the use of electron microscopy in oncological practice for purposes of differential diagnosis. It also allows rejection of the concept of "dedifferentiation" and ultrastructural "simplification" as main ways of formation of neoplastic cells.

Diagnosis, Differential↗

PubMed1988

Increase in radioresponse of murine tumors by treatment with indomethacin.

Indomethacin, an inhibitor of prostaglandin (PG) synthesis, was investigated for its ability to increase radioresponse of two fibrosarcomas, FSA and NFSA, in C3Hf/Kam mice. In addition, the effect of indomethacin on radioresponse of hematopoietic tissue, jejunum, hair follicles, and tissues involved in the development of radiation-induced leg contractures was determined. Indomethacin greatly increased radioresponse of 8-mm tumors, as assessed by both tumor growth delay and TCD50 assays. Enhancement factors for tumor growth delay and tumor radiocurability (TCD50) were 1.55 and 1.39, respectively, for FSA, and 1.4 and 1.26, respectively, for NFSA tumors. Of four normal tissues assessed, two (hair follicles and tissues responsible for development of leg contractures) showed no change in radioresponse after treatment with indomethacin, one (hematopoietic tissue) exhibited radioprotection, and one (jejunum) exhibited slight radiosensitization (enhancement factor, 1.12). Therefore, indomethacin significantly augmented tumor radiocurability but had minimal effect on radioresponse of some normal tissues.

Animals↗

PubMed1986

Radiographic bone surveys in the evaluation of primary bone tumors in dogs.

Forty-two dogs with primary bone tumors underwent radiographic bone surveys. The use of radiographic bone surveys led to a higher yield in finding other nonclinically detectable neoplastic sites (7.1%) than did thoracic radiographs (4.7%). Multicentric bone tumors accounted for 9.5% of total cases. Bone infarcts were identified in 3 dogs (7.1%).

Animals↗

PubMed1986

Generation of tumor-specific transplantation antigens by UV radiation can occur independently of neoplastic transformation.

The purpose of this study was to determine whether the UV-associated antigens present on tumors induced in mice by chronic UV irradiation could be induced by in vitro irradiation of cells that were already tumorigenic, or whether their occurrence was associated with the primary neoplastic transformation event. Cells of a nonantigenic, spontaneous fibrosarcoma cell line were exposed to UV radiation in vitro, were cloned, and were tested for antigenic properties. A large number of the clones obtained after UV irradiation of the fibrosarcoma cells were highly antigenic (20 of 39), whereas clones derived from unirradiated cultures were not (0 of 10). The antigenic variants did not induce cross-protection among themselves, but induced only variant-specific immunity in vivo. Several antigenic variants were tested for susceptibility to the action of UV-induced suppressor cells, which seem to recognize a common determinant shared among UV-induced tumors. The variants tested were indeed subject to the activity of the UV-induced suppressor lymphocytes. These results demonstrate that the unique antigenic properties exhibited by UV-induced murine skin cancers are also exhibited by cells exposed to UV radiation in vitro. In addition, they imply that the UV-associated antigens arise as a consequence of exposing cells to UV radiation and that they can occur independently of an initial neoplastic transformation event.

Animals↗

PubMed1968