IL-1β levels were higher in LB/ARAD [23.11 pg/ml (0.53–269.11 pg/ml); P = 0.03] and PAN [63.11 pg/ml (11.21–1180.65 pg/ml); P < 0.0001] compared with the control [1.23 pg/ml (0.39–30.88 pg/ml)]. This evidence concerns the gene IL1B and polyarteritis nodosa.