Kinetics of main lymphocyte subsets in the peripheral blood. (A) Frequency of main lymphocyte subsets by flow cytometry in peripheral blood of cHL patients before and 1 week after SOT. *P ≤ .05, **P ≤ .01, 2-tailed paired Student t test. (B) Increase in peripheral blood naive CD8⁺ T cells 1 week after nivolumab SOT. ***P = .0005, Sidak’s multiple-comparisons test. ns, not significant; TCM, central memory T cells; TEM, effector memory T cells.