Some studies demonstrated that EPA could inhibit IDO expression in tumor cells,15 while EPA‐derived metabolite resolvin E1 can induce several biological responses, including inhibition of dendritic cell migration and leukocyte infiltration, modulation of IDO synthesis in dendritic cells, inhibition of T cell activation, and modulation of effector T cell death.16 The gene discussed is IDO1; the disease is neoplasm.