CASP7 and cancer: Confirmatory experiments on NCI-N87, evaluating caspase-3 and caspase-7 activities, showed an increase in apoptosis after 24 h of treatment with 1 ng/mL ctrl (ctrl 24,938 ± 1537 vs. 1 ng/mL 35,442 ± 433; p < 0.05) (Figure S4a), while the annexin V/propidium iodine assay showed an increase in apoptosis at 0.1 ng/mL after 6 h of treatment (ctrl 13.4% ± 1.3 vs. 0.1 ng/mL 33.2% ± 2.9; p < 0.05) (Figure S4b), indicating that IL-33 could induce apoptosis in cancer cell lines.