Abstract
The PI3K-Akt-mTOR pathway canonically transduces intracellular signals initiated by insulin binding to its cognate receptor tyrosine kinase (RTK), thereby integrating the sensing of systemic nutrient availability with the regulation of cellular metabolism, growth, and proliferation. As a result of the large-scale sequencing and analysis of human cancer genomes, the PI3K-Akt-mTOR signaling pathway is now also well appreciated to be commonly dysregulated in cancers arising from diverse tissues of origin. Somatic genetic changes have been identified in PIK3CA, PTEN, Akt1, mTOR, and other genes, many of which are known to play important functional roles in cancer cell proliferation and survival. The ubiquity of PI3K-Akt-mTOR pathway activation in cancer has prompted significant interest in the development of small molecule inhibitors of various components of the signaling pathway. Multiple compounds are presently being evaluated in human clinical trials and may enter the armamentarium of standard cancer treatments in the future. Those studies completed to date have highlighted a number of key challenges that will need to be overcome to realize the full potential of targeting the PI3K-Akt-mTOR signaling pathway for clinical benefit. To improve the therapeutic window for PI3K pathway inhibition, compounds that preferentially target the mutant protein may be required. Second, the identification of improved response biomarkers will be needed to facilitate precision trials that aim to enroll only the patients who are most likely to respond to therapy. Third, a comprehensive understanding of the most common mechanisms that promote recovery of signaling activity during drug treatment may provide important leads for new therapeutic combinations. Lastly, strategies for co-drugging may also arise from an improved understanding of how inhibition of PI3K signaling—even when cell cycle arrest and/or apoptosis are insufficient for clinical benefit—creates new vulnerabilities that may be exploited by other available therapies. Such studies will provide a robust preclinical foundation for clinical trials of rational combinations of PI3K-directed therapies with other targeted agents, cytotoxic chemotherapy or immunotherapy that aim to boost clinical response rates, improve treatment durability, and offer cures to greater numbers of patients suffering from cancer.
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Acknowledgments
This contribution was supported by NIH grants P50-GM107618 and T32-CA009172, as well as by the Dana-Farber Leadership Council.
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Chopra, S.S., Cantley, L.C. (2016). PI3K-Akt-mTOR Signaling in Cancer and Cancer Therapeutics. In: Dey, N., De, P., Leyland-Jones, B. (eds) PI3K-mTOR in Cancer and Cancer Therapy. Cancer Drug Discovery and Development. Humana Press, Cham. https://doi.org/10.1007/978-3-319-34211-5_1
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