Cancer cell lines were treated with control, olaparib, TRAIL, and olaparib plus TRAIL in increasing concentrations, representing multiples of the IC50 of each drug at a constant ratio (e.g., 1⁄2 × IC50 olaparib: 1⁄2 × IC50 TRAIL, 1 × IC50 olaparib: 1 × IC50 TRAIL, etc.)to determine the cell proliferation index. This evidence concerns the gene TNFSF10 and cancer.