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- W2104486103 abstract "In vitro culture of a human breast cancer biopsy fragment gave rise to two permanent cell lines, CAL 18 A and CAL 18 B, which were differentiated by both morphological and ultrastructural analysis. The karyotypic and growth properties of these two cell lines also differed, providing further evidence of cell heterogeneity within a given tumor. Both cell lines lost their hormone receptors in vitro. CAL 18 A cells grew in agar and were tumorigenic after inoculation into nude mice; neither of these properties was observed in CAL 18 B cells. The chemosensitivity of 12 antineoplastic drugs was assessed by a short-term assay, using inhibition of tritiated thymidine incorporation by the cells after contact with the drugs as the end point. Only a few drugs were active at moderate concentrations. The overall responses of both cell lines were similar. The cell survival curves, established by the colony method following a single dose of radiation, were also very similar, despite the greater heterogeneity of CAL 18 B cells. The two cell lines appear to be interrelated, since CAL 18 B cells were occasionally observed to emerge from CAL 18 A clones, suggesting that malignant cell redifferentiation may occur spontaneously in vitro." @default.
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- W2104486103 date "1985-03-01" @default.
- W2104486103 modified "2023-10-18" @default.
- W2104486103 title "Establishment, characterization, chemosensitivity, and radiosensitivity of two different cell lines derived from a human breast cancer biopsy." @default.
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