Towards enhancing the predictive value of the microbiota for cancer immunotherapy.

The gut microbiota has emerged as a potential determinant of immune checkpoint inhibitor (ICI) response, yet using it as a biomarker remains challenging. A recent study in Cell by Derosa et al. describes a two-tier model based on gut microbiota composition to discriminate responder from non-responder patients with cancer, offering new ideas that could be leveraged in the clinic.