Therefore, the expression pattern of the two leukotriene B4 receptors BLT-1 and BLT-2 as well as the two receptors for cysteinyl-leukotrienes (CysLT-1 and CysLT-2) was studied by immunohistochemistry in a prospective study cohort of patients with GC. The gene discussed is LTB4R2; the disease is gastric cancer.