The present invention relates to a combination of a signal transducer and activator of transcription 3 (STAT3) activity inhibitor； and an immune checkpoint inhibitor for use in treating or preventing the hyperproliferative disorder in a subject. Preferably, the STA3 activity inhibitor is pyrimethamine or atovaquone, and the immune checkpoint inhibitor is an anti-PD1 antibody. Preferably, the hyperproliferative disorder is a glioma or a glioblastoma.
