Sera concentration of IL-33 and sST2 was significantly higher in patients with breast cancer than in healthy volunteers (IL-33: 200.20 ± 9.35 pg/mL versus 16.34 ± 0.68 pg/mL, sST2: 104.30 ± 4.54 pg/mL versus 26.13 ± 1.20 pg/mL). The gene discussed is IL33; the disease is breast cancer.