IL1B and rheumatoid arthritis: In the meantime, treatments with QRF (0.05, 0.5, and 5 μg/mL) and suramin 50 μg/mL for 24 h exhibited a comparable (P > 0.05) cell percentage of IL-1β-induced HFLS-RA to the negative control, with less than 20% of cell population were observed within the early and late apoptotic quadrant, respectively (Table 2).