IL6 and neutropenia: Interestingly, neutropenic patients had particularly high IL-6 plasma concentrations (median IL-6 plasma concentration 7866 pg/mL (IQR 333-62,835 pg/mL, n = 31) and 130 (IQR 35–684 pg/mL, n = 129) in patients with neutropenia and without neutropenia, respectively).