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• W2775456210 startingPage "1146" @default.
• W2775456210 abstract "Cutaneous squamous cell carcinoma (SCC) is a recurrent cancer that is prevalent in predisposed subjects such as immunosuppressed patients and patients being treated for other malignancies. Model systems to trial therapies at different stages of SCC development are lacking, therefore precluding efficient therapeutic interventions. Here, we have disrupted the expression of the tumor suppressor GRHL3 to induce loss of PTEN and activation of the PI3K/mTOR signaling pathway in mice and human skin, promoting aggressive SCC development. We then examined the potential for targeting PI3K/mTOR and an oncogenic driver miR-21, alone and in combination, for the prevention and treatment of SCC during the initiation, promotion/progression and establishment stages. Treatment with PI3K/mTOR inhibitors completely prevented tumor initiation, and these inhibitors significantly delayed the course of papilloma progression to malignancy. However, established SCC did not undergo any growth regression, indicating that this therapy is ineffective in established cancers. Mechanistically, the resistant SCCs displayed increased miR-21 expression in mice and humans where antagonists of miR-21 rescued expression levels of GRHL3/PTEN, but the combination of miR-21 antagonism with PI3K/mTOR inhibition resulted in acquired SCC resistance in part via c-MYC and OCT-4 upregulation. In conclusion, our data provide molecular evidence for the efficacy of targeting oncogenic drivers of SCC during the initiation and promotion stages and indicate that combination therapy may induce an aggressive phenotype when applied in the establishment stage." @default.
• W2775456210 created "2017-12-22" @default.
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• W2775456210 date "2017-12-13" @default.
• W2775456210 modified "2023-10-09" @default.
• W2775456210 title "Stage-dependent therapeutic efficacy in PI3K/mTOR-driven squamous cell carcinoma of the skin" @default.
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• W2775456210 doi "https://doi.org/10.1038/s41418-017-0032-0" @default.
• W2775456210 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5988694" @default.
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