Fig. 3

Pharmacodynamic assessment of target coverage and T cell activation. a flow cytometry analysis of GITR expression among peripheral blood Tregs pretreatment and posttreatment. b immunohistochemistry assessment of GITR expression and T cell activation in tumor biopsies pretreatment and posttreatment. c immunohistochemistry evidence of immune modulation following treatment (cycle 3, day 43) versus screening in a colorectal cancer biopsy. aLines not visible for 7 patients due to lack of GITR+ cells at pretreatment