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Updated: Nov 2, 2025

Testing Targeted Therapies in Cancer using Structural DNA Alteration Analysis and Patient-Derived Xenografts
Published on: July 25, 2020
mTOR pathway and DNA damage response: A therapeutic strategy in cancer therapy
Romina Danesh Pazhooh1, Parnia Rahnamay Farnood1, Zatollah Asemi2
1Islamic Azad University, Tehran Medical Sciences Branch, Tehran, Iran.
Abstract:
The mammalian target of rapamycin (mTOR) is a conserved serine/threonine-protein kinase, comprising two subunit protein complexes: mTORC1 and mTORC2. In response to insult and cancer, the mTOR pathway plays a crucial role in regulating growth, metabolism, cell survival, and protein synthesis. Key subunits of mTORC1/2 catalyze the phosphorylation of various molecules, including eukaryotic translation initiation factor 4E binding protein 1 (4E-BP1), ribosomal protein S6 kinase β-1 (S6K1). The DNA damage response (DDR) maintains genomic stability and provides an opportunity for treating tumors with defects caused by DNA damaging agents. Many mTOR inhibitors are utilized for the treatment of cancers. However, several clinical trials are still assessing the efficacy of mTOR inhibitors. This paper discusses the role of the mTOR signaling pathway and its regulators in developing cancer. In the following, we will review the interaction between DDR and mTOR signaling and the innovative therapies applied in preclinical and clinical trials for treating cancers.
Insights
The mammalian target of rapamycin (mTOR) pathway regulates cell growth and is crucial in cancer. This review explores mTOR signaling, DNA damage response (DDR) interactions, and novel cancer therapies.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- The mammalian target of rapamycin (mTOR) pathway, comprising mTORC1 and mTORC2 complexes, is vital for cell growth, metabolism, survival, and protein synthesis.
- Dysregulation of the mTOR pathway is implicated in various cancers.
- The DNA damage response (DDR) is essential for maintaining genomic stability and presents therapeutic opportunities in cancer treatment.
Purpose of the Study:
- To discuss the role of the mTOR signaling pathway and its regulators in cancer development.
- To review the intricate interactions between DNA damage response (DDR) and mTOR signaling.
- To highlight innovative therapies targeting the mTOR pathway in preclinical and clinical cancer trials.
Main Methods:
- Literature review of studies on mTOR signaling in cancer.
- Analysis of the interplay between DNA damage response (DDR) and mTOR pathways.
- Examination of preclinical and clinical trial data for mTOR inhibitors in cancer therapy.
Main Results:
- The mTOR pathway is a critical regulator of cellular processes frequently altered in cancer.
- Interactions between DDR and mTOR signaling pathways influence cancer progression and treatment response.
- mTOR inhibitors are established and emerging therapeutic agents for various cancers, with ongoing clinical evaluation.
Conclusions:
- The mTOR pathway is a significant target for cancer therapy.
- Understanding the crosstalk between DDR and mTOR signaling can lead to more effective treatment strategies.
- Further clinical trials are necessary to fully elucidate the efficacy of mTOR inhibitors in diverse cancer types.
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