HCT116, HT29, HCT116/R, and HT29/R (5X103 cells/well) were seeded in 96-well plates, and treated with 1, 2, 4, 8, 16, 32, 64, or 128 μM oxaliplatin for 24 hours. Cells were then incubated with CCK8 (Cell Counting Kit-8) (Dojindo, Tokyo, Japan) for another 2 hours, and the absorbance at 450 nm was measured using Microplate Autoreader (Thermo Fisher) according to previous study [15 (link)]. Moreover, HCT116/R and HT29/R cells were seeded in 96-well plates, and then transfected with shNC, shWDR62-1# or shWDR62-2# (GenePharma, Suzhou, China) using Lipofectamine 2000 (Gibco, Carlsbad, CA, USA) for 48 hours. Cells were then also subjected to CCK8 assay to detect the absorbance at 450 nm.