Bifidobacterium longum, Dorea formicigenerans, Collinsella aerofaciens, Alistipes putredinis, and Prevotella copri are reportedly enriched in responders to anti-PD 1 treatment in melanoma [236] and non-small-cell lung cancer [237], with Ruminococcus obeum, and Roseburia intestinalis found to be more abundant in non-responders. This evidence concerns the gene RPL17 and melanoma.