No differences in CD8 + T cell or CD4 + T cell counts; CD68 + tissue ratio; and CD8 + T cell, CD4 + T cell, and CD68 + cell infiltration patterns were observed between the five anti-CTLA-4 nor the seven anti-PD-1 colitis samples, nor between responders and non-responders to either ICIs or corticosteroids (Supplementary Table 2). Here, CTLA4 is linked to colitis.