PDCD1 and melanoma: Analysis of fecal microbiome signatures of 94 melanoma patients who received anti-PD-1 immunotherapy showed that Ruminococcus (Mediterraneibacter) torques, Blautia producta, Blautia wexlerae, Blautia hansenii, Eubacterium rectale, Ruminococcus (Mediterraneibacter) gnavus, and Anaerostipes hadrus are increased in non-progressors.