COLO205 or HCT116 colorectal cancer cells (1 × 104 cells/well) were seeded onto an opaque white 96-well plate 1 day before treatment. COLO205 or HCT116 cells were treated with SP2509 or doxorubicin for 9 and 24 hours, respectively. Post-treatment, 100 μL of Caspase-Glo 3/7 reagent (Promega) was added to each of the 100 μL of medium-containing cells. The plate was mixed for 1 minute and then incubated at room temperature for 30 minutes before measurement with a luminometer (USA).
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