PDCD1 and nasopharyngeal carcinoma: A recent study (NCT02339558) used nivolumab (another anti-PD1 antibody) to treat nine patients with recurrent and/or metastatic NPC for more than 12 months (20%) and found the overall one-year survival rate to be 59% (95% CI = 44.3% to 78.5%) and the PFS in 1 year to be 19.3% (95% CI = 10.1% to 37.2%) [69].