IL6 and primary cutaneous T-cell non-Hodgkin lymphoma: The median and mean ± SD serum IL-6 levels in CTCL patients were significantly higher than in healthy controls (6.85 ± 8.78 pg/ml; 4.31 pg/ml; range: 0.14–53.0 compared to 1.4 ± 1.28 pg/ml; 1.05 pg/ml; range: 0.08–6.27; p < 0.05) (Fig. 1).