After having verified the expression of IL-33 and its receptor in gastric biopsies from healthy and gastric cancer patients, we evaluated the expression of the cell cycle candidate genes before and after stimulation with the cytokine and, as Kania et al. [33] and Sun et al. [34] reported, we observed that CASP3 expression was decreased in patients with gastric tumors compared to normal gastric tissue. This evidence concerns the gene IL33 and gastric cancer.