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- W1595281177 abstract "We have used irradiation to induce marker chromosome formation in a metastasizing murine tumor with a stable karyotype. The induced recombinant chromosomes then served to determine whether metastases were of clonal or multicellular origin. Cumulative data were obtained from four series of experiments on spontaneous metastases originating from tumors grown from irradiated cells; 20 of these metastases expressed unique chromosomal alterations consistent with a clonal origin. The majority of metastasis-derived cell populations remain stable with respect to their marker chromosomes in culture as well as in successive animal transplantation. In several instances, however, chromosomal instability was sufficient to obscure the cellular origins of individual metastases. A few metastases showed mixed chromosomal patterns initially that were consistent with multicellular origin, but repeat examinations have revealed a chromosomal instability which persisted during propagation in culture. The frequency of chromosomal recombinants in metastases from the combined series was sufficient to suggest biological and statistical significance. The morphology of recombinants was not associated with radiation dose but appeared as an apparently random response of the tumor population in different experiments. Analysis of chromosomal markers by banding techniques was performed to determine if specific chromosomes or chromosomal sites were associated with tumor cells from metastatic foci (a host-selected subpopulation with a metastatic phenotype). Our results did not reveal preferential involvement of whole chromosomes or intrachromosomal sites in recombinant formation." @default.
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- W1595281177 date "1988-02-15" @default.
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- W1595281177 title "Irradiation-induced marker chromosomes in a metastasizing murine tumor." @default.
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