Patients with high pretreatment sPD-1 levels (highest third, “high sPD-1 group”) had significantly worse outcomes than patients with low pretreatment sPD-1 levels (lowest two-thirds, “low sPD-1 group”) (five-year OS 78% vs. 91%, p = 0.021; five-year PFS 73% vs. 89%, p = 0.016; Figure 4)...The patients were treated with biweekly rituximab, cyclophosphamide, doxorubicin, etoposide, and prednisone (R-CHOEP) immunochemotherapy...