None of the laboratory-tested blood parameters (Plts, WBC, IgG, IgA, IgM, albumin, CRP, ferritin, fibrinogen, Hb, total protein) differed significantly between the relapsed and non-relapsed pediatric/adolescent HL patients in either of the cohorts (t-test, p-value > 0.05; Table S1). This evidence concerns the gene GSTM1 and Hodgkins lymphoma.