Tissue culture conditions and drug treatments were performed as described [49]. 5-Fluorouracil, cisplatin, paclitaxel and doxorubicin were purchased from Sigma-Aldrich (St. Louis, MO, USA). 1 × 105 Cells were seeded in six well plates followed by treatment with 10 μM Cisplatin, 300 μM 5-Fluorouracil, 0.05 μM Paclitaxel and 0.345 μM doxorubicin for 72 h. For γ-Irradiation, the cells were treated once with 15 Gy of ɣ-radiation using Gamma cell 40 exactor (Best Theratronics, Ontario, Canada) and incubated for 72 h. Annexin V staining was performed as recommended by manufacturer (Life Technologies, Netherlands). The samples were read out using FACSCanto II (BD Biosciences, San Jose, CA, USA) and analyzed with FACSDiva software (BD Biosciences) within 4 h.
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