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Pembrolizumab (MK-3475) Versus Standard Treatment for Recurrent or Metastatic Head and Neck Cancer (MK-3475-040/KEYNOTE-040)
head and neck squamous cell cancer, squamous cell carcinoma, head and neck carcinoma, programmed cell death-1 (pd1, pd-1),, programmed death-ligand 1 (pdl1, pd-l1), programmed cell death receptor ligand 2 (pdl2, pd-l2), interventional, phase3
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