1. Valent, P. et al. Cancer stem cell definitions and terminology: the devil is in the details. Nature Rev. Cancer 12, 767–775 (2012).
2. Wilson, E. B. The Cell in Development and Inheritance (ed. Osborn, H. F.) (The Macmillan Company, 1896).
3. Pierce, G. B. & Speers, W. C. Tumors as caricatures of the process of tissue renewal: prospects for therapy by directing differentiation. Cancer Res. 48, 1996–2004 (1988).
4. Carney, D. N., Gazdar, A. F., Bunn, P. A. Jr & Guccion, J. G. Demonstration of the stem cell nature of clonogenic tumor cells from lung cancer patients. Stem Cells 1, 149–164 (1982).
5. Wiseman, D. H., Greystoke, B. F. & Somervaille, T. C. The variety of leukemic stem cells in myeloid malignancy. Oncogene http://dx.doi.org/10.1038/onc.2013.269 (2013).