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2016 ; 12
(5
): 3059-3065
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Radiation induces the generation of cancer stem cells: A novel mechanism for
cancer radioresistance
#MMPMID27899964
Li F
; Zhou K
; Gao L
; Zhang B
; Li W
; Yan W
; Song X
; Yu H
; Wang S
; Yu N
; Jiang Q
Oncol Lett
2016[Nov]; 12
(5
): 3059-3065
PMID27899964
show ga
Radioresistance remains a major obstacle for the radiotherapy treatment of
cancer. Previous studies have demonstrated that the radioresistance of cancer is
due to the existence of intrinsic cancer stem cells (CSCs), which represent a
small, but radioresistant cell subpopulation that exist in heterogeneous tumors.
By contrast, non-stem cancer cells are considered to be radiosensitive and thus,
easy to kill. However, recent studies have revealed that under conditions of
radiation-induced stress, theoretically radiosensitive non-stem cancer cells may
undergo dedifferentiation subsequently obtaining the phenotypes and functions of
CSCs, including high resistance to radiotherapy, which indicates that radiation
may directly result in the generation of novel CSCs from non-stem cancer cells.
These findings suggest that in addition to intrinsic CSCs, non-stem cancer cells
may also contribute to the relapse and metastasis of cancer following
transformation into CSCs. This review aims to investigate the radiation-induced
generation of CSCs, its association with epithelial-mesenchymal transition and
its significance with regard to the radioresistance of cancer.