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XRCC1 is related to CD133+GBC-SD cells resistance to 5-FU. (A) Cell viability of cells treated with 5-FU 72 h was assessed by CCK8 (**P < 0.01). (B) Apoptosis of cells treated with 5-FU 72 h was examined by Flow cytometer; Q1-UL: necrosis cells, Q1-UR: late apoptosis cells, Q1-LL: normal cells, Q1-LR: early apoptosis cells.
