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2017 ; 2017
(ä): 1726078
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Resistance to mTORC1 Inhibitors in Cancer Therapy: From Kinase Mutations to
Intratumoral Heterogeneity of Kinase Activity
#MMPMID28280521
Faes S
; Demartines N
; Dormond O
Oxid Med Cell Longev
2017[]; 2017
(ä): 1726078
PMID28280521
show ga
Targeting mTORC1 has been thoroughly explored in cancer therapy. Following
encouraging preclinical studies, mTORC1 inhibitors however failed to provide
substantial benefits in cancer patients. Several resistance mechanisms have been
identified including mutations of mTOR and activation of alternate proliferation
pathways. Moreover, emerging evidence discloses intratumoral heterogeneity of
mTORC1 activity that further contributes to a reduced anticancer efficacy of
mTORC1 inhibitors. Genetic heterogeneity as well as heterogeneous conditions of
the tumor environment such as hypoxia profoundly modifies mTORC1 activity in
tumors and hence influences the response of tumors to mTORC1 inhibitors.
Intriguingly, the heterogeneity of mTORC1 activity also occurs towards its
substrates at the single cell level, as mutually exclusive pattern of activation
of mTORC1 downstream effectors has been reported in tumors. After briefly
describing mTORC1 biology and the use of mTORC1 inhibitors in patients, this
review will give an overview on concepts of resistance to mTORC1 inhibition in
cancer with a particular focus on intratumoral heterogeneity of mTORC1 activity.