The invention provides methods of treating or delaying progression of cancer in an individual comprising administering to the individual an anti-human OX40 agonist antibody. In some embodiments, the antibody is administered in a dose selected from about 0.2 mg, about 0.8 mg, about 3.2 mg, about 12 mg, about 40 mg, about 80 mg, about 130 mg, about 160 mg, about 300 mg, about 320 mg, about 400 mg, about 600 mg, and about 1200 mg.