Boldface font indicates statistical significance (P < .05).

Number of cases with information enabling evaluation of overall survival

For the multivariate model, all factors were included that were of significance (P < 0.05), or borderline significance (P < 0.10) in univariate or age adjusted analyses (PD-L1, age, stage, male sex, WBC count, albumin, ESR, bulky tumor, B symptoms, and extranodal involvement). Also, nodular sclerosis histology, EBV status, hemoglobin, lymphocyte count, and country (Denmark/Sweden) were added to the multivariate model because the distribution of these variables differed between high and low PD-L1 (Table 1).

Proportion of positive leukocytes

Not tested.

Not applicable.