Summary
Over the last five years, the expression of p27kipl, a cyclin-dependent kinase inhibitor, has proved to be a strong prognostic indicator for long-term survival of patients with tumors of the colon, breast, prostate, lung, pituitary, and many other tissues. Tumors arising in these organs that were not expressing p27 protein tended to be more aggressive and patients had a poorer clinical outcome. However, it is not clear why p27 was such a strong prognostic indicator in multiple tissues. Furthermore, before p27 is brought into widespread clinical use, prospective studies will be required to validate, in advance, a clinical course or response to therapy. Without the essential knowledge of what low p27 prognosticates, vis a vis the evolution of the tumor, validation will be difficult. Because there is no possibility of determining directly how low p27 expression facilitates tumor development in humans, we have turned to developing mouse models. However, we had to first ask the following questions: Does p27 deficiency contribute to tumor development in the mouse? If p27 deficiency contributed to tumor development, does it mimic the human condition, i.e., were tumors more aggressive? Then, if they were more aggressive, what was the mechanism underlying this? Before we begin to discuss these issues, I apologize to the many investigators whose work will be either uncited or cited only by review.
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Koff, A. (2003). p27, A Prognostic Indicator Reflecting ...?. In: Giordano, A., Soprano, K.J. (eds) Cell Cycle Inhibitors in Cancer Therapy. Cancer Drug Discovery and Development. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-59259-401-6_2
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DOI: https://doi.org/10.1007/978-1-59259-401-6_2
Publisher Name: Humana Press, Totowa, NJ
Print ISBN: 978-1-61737-257-5
Online ISBN: 978-1-59259-401-6
eBook Packages: Springer Book Archive