1. Nowell PC. The clonal evolution of tumor cell populations. Science 194:23–28, 1976.
2. Fialkow PJ. Clonal origin of human tumors. Biochim Biophys Acta 458:283–321, 1976.
3. Califano J, van der Riet P, Westra W, et al. Genetic progression model for head and neck cancer: Implication for field cancerization. Cancer Res 56:2488–2492, 1996.
4. Jones PA, Droller MJ. Pathways of development and progression in bladder cancer: New correlations between clinical observations and molecular mechanisms. Semin Urol 11:177–192, 1993.
5. Vogelstein B, Fearon ER, Hamilton SR, et al. Genetic alterations during colorectal tumor development. N Engl J Med 319:525–532, 1988.