sIL-2Rα serum levels in FL correlates with poor survival. (A) sIL-2Rα serum levels measured by multiple ELISA (Luminex) in untreated FL patients (median: 2.03 ± 0.31 ng/mL, n = 33) and healthy donors (median: 0.74 ± 0.08 ng/mL, n = 24). (B) A Kaplan-Meier curve for progression-free survival by serum levels of sIL-2Rα in FL patients with a cutoff of 1.42 ng/mL (n = 30). (C) IL-2 serum levels measured by multiple ELISA (Luminex) in untreated FL patients (median: 0.024 ng/mL, n = 30) and healthy donors (median: 0.035 ng/mL, n = 22).