Peripheral blood cells obtained from baseline, week 1, week 6, week 8, and week 30 were analyzed by flow cytometry.
(A) Fold change in absolute CD3+CD8+ cells.
(B) Fold change in absolute CD3+CD4+ cells.
(C) Percentage change in Ki67+ (CD3+CD8+) cells.
(D) Percentage change in PD-1+ (CD3+CD8+) cells at week 1 and week 6 only; after starting on pembrolizumab, the staining antibody competed for the same epitope.
(E) Percentage change in TIM3+ (CD3+CD8+) cells.
(F) Percentage change in BTLA+ (CD3+CD8+) cells.
p values for comparison with baseline are shown below data for each postbaseline visit, based on contrasts from linear mixed-effects modeling. Response is color-coded for best overall response per investigator (complete or partial response in red and nonresponse in blue). Abbreviations: BTLA, B- and T-lymphocyte attenuator; PD-1, programmed death protein 1.