SOLUTION: The present invention provides a method for treating tumors in a
human patient, the method including: (i) identifying a patient as having a
LAG-3 positive tumor; and (ii) administering, to the patient, a PD-1 pathway inhibitor, a combination of a PD1 pathway inhibitor and an
immune checkpoint inhibitor, a combination of a
LAG-3 inhibitor and a PD-1 pathway inhibitor, or an anti-CTLA4
antibody. In some embodiment, the method further includes identifying the patient as having the
LAG-3 positive PD-L1 positive tumors. In some embodiment, the LAG-3 inhibitor is an anti-LAG-3
antibody, and the PD-1 pathway inhibitor is an anti-PD-1
antibody.EFFECT: The method of the present invention can improve a response to a treatment with the PD-1 pathway inhibitor, the combination of the PD1 pathway inhibitor and the
immune checkpoint inhibitor, or the combination of the LAG-3 inhibitor and the PD-1 pathway inhibitor.SELECTED DRAWING: None