Abstract
Variability in the phenotype of cells comprising individual tumours is a striking feature of animal and human cancer and is generally referred to as tumour heterogeneity1. Studies of clonally derived cell populations from tumours that originated presumably from a single transformed cell have shown that tumours are made up of cells that differ in a variety of traits, including drug resistance, antigen expression and metastatic potential2–6. The origin and maintenance of tumour heterogeneity are unclear, but mutational and epigenetic mechanisms are thought to be involved. Here we report the results of a search for transforming genes in human melanoma which have raised the possibility that ras gene activation follows the same variable pattern as other traits involved in tumour heterogeneity. DNA from 4 of 30 melanoma cell lines yielded transforming ras genes in the NIH/3T3 assay. Of five cell lines originating from separate metastatic deposits of a single patient, only one contained activated ras, indicating heterogeneity in ras activation in this case and suggesting that ras activation was not involved in tumour initiation or maintenance in this patient.
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Albino, A., Strange, R., Oliff, A. et al. Transforming ras genes from human melanoma: a manifestation of tumour heterogeneity?. Nature 308, 69–72 (1984). https://doi.org/10.1038/308069a0
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DOI: https://doi.org/10.1038/308069a0
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