Table 3.

Cytokine levels (pg/mL) in patients with PsA stratified by LN

	n (%) of positive patients	All n = 42	LN+ n = 20 (47.6%)	LN- n = 22 (52.4%)	Wilcoxon P value
GM.CSF	4 (10%)	0 (0; 0)	0 (0; 0)	0 (0; 0)	0.051
IFN-γ	6 (14%)	0 (0; 0)	0 (0; 0)	0 (0; 0)	0.444
IL-1β	7 (7%)	0 (0; 0)	0 (0; 0)	0 (0; 0)	0.632
IL-2	21 (50%)	42 (0; 133)	0 (0; 151)	83 (0; 119)	0.851
IL-4	2 (2%)	0 (0; 0)	0 (0; 0)	0 (0; 0)	0.365
IL-5	19 (19%)	0 (0; 0)	0 (0; 0)	0 (0; 0)	0.440
IL-6	41 (98%)	1241 (503; 1,544)	1324 (764; 1,496)	1093 (258; 1,720)	0.462
IL-10	22 (52%)	4 (0; 13)	4.4 (0; 12)	0 (0; 14)	0.926
IL-12p70	0	0 (0; 0)	0 (0; 0)	0 (0; 0)	NA
IL-13	4 (10%)	0 (0; 0)	0 (0; 0)	0 (0; 0)	0.348
IL-15	38 (91%)	114 (47; 197)	180 (109; 261)	62 (23; 115)	0.002
IL-17	11 26%)	0 (0; 20)	0 (0; 7)	0 (0; 26)	0.757
IL-17F	12 (29%)	0 (0; 12)	0 (0; 6)	0 (0; 12)	0.728
IL-21	19 (45%)	0 (0; 817)	0 (0; 773)	0 (0; 958)	0.591
IL-22	1 (2%)	0 (0; 0)	0 (0; 0)	0 (0; 0)	0.317
IL-23	15 (36%)	0 (0; 212)	0 (0; 190)	0 (0; 262)	0.758
IL-28A	0	0 (0; 0)	0 (0; 0)	0 (0; 0)	NA
CCL20	34 (81%)	37 (6; 497)	23 (7; 284)	40 (1; 624)	0.752
TGF-β1	8 (19%)	0 (0; 0)	0 (0; 0)	0 (0; 446)	0.157
TNF-α	4 (10%)	0 (0; 0)	0 (0; 0)	0 (0; 0)	0.323
TNF-β	7 (17%)	0 (0; 0)	0 (0; 0)	0 (0; 0)	0.684

Data are expressed as median (IQR). NA, not applicable.