Single cell RNA sequencing (scRNA-seq) was performed with peripheral blood cells before (Day 0, T0), during nivolumab treatment (Day 7, T1; Day 21, T2), and when plasma EBV turned negative (Day 76, T3) in 1 patient (patient 7). scRNA-seq libraries were generated following the recommended protocol of the 3’ scRNA-seq 10X genomics platform and using v2 chemistry, and sequenced data was collected by illumina NovaSeq 6000 sequencing. Overall design: Single cell RNA sequencing (scRNA-seq) in 4 stages