Cancer cell lines are essential platforms for performing cancer research on human cells. We here demonstrate that, across tumor entities, human cancer cell lines harbor minority populations of putative stem-like cells, molecularly defined by dye extrusion resulting in the side population phenotype. These findings establish a heterogeneous nature of human cancer cell lines and argue for their stem cell origin. This should be considered when interpreting research involving these model systems.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4872646PMC
http://dx.doi.org/10.18632/oncoscience.300DOI Listing

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