Numbers of patients (%) with various HLA alleles in juvenile PsA compared with other subtypes of JIA and healthy controls.
| PSA, n = 31 | Persistent Oligoarthritis, n = 95 | Extended Oligoarthritis, n = 42 | RF-negative Polyarthritis, n = 57 | RF-positive Polyarthritis, n = 11 | ERA, n = 55 | Systemic Arthritis, n = 23 | Undifferentiated Arthritis, n = 21 | Controls, n = 295 | |
|---|---|---|---|---|---|---|---|---|---|
| HLA-B27 | 6 (19) | 16 (17) | 5 (12) | 11 (19) | 1 (9) | 47 (85)*** | 2 (9) | 1 (5) | 35 (12) |
| DRB1*01 | 8 (26) | 14 (15) | 18 (43) | 5 (9)* | 5 (46) | 13 (24) | 5 (22) | 3 (14) | 57 (19) |
| DRB1*04 | 6 (19) | 16 (17) | 6 (14) | 15 (26) | 6 (55)* | 20 (36) | 9 (39) | 8 (38) | 99 (34) |
| DRB1*11/12 | 9 (29) | 17 (18) | 7 (17) | 8 (14) | 1 (9) | 6 (11)* | 3 (13) | 2 (10) | 32 (11)** |
| DRB1*08 | 8 (26) | 36 (38) | 12 (29) | 20 (35) | 1 (9) | 16 (29) | 2 (9) | 7 (33) | 20 (7)*** |
| DPB1*02 | 9 (29) | 48 (51)* | 15 (36) | 13 (23) | 1 (9) | 12 (22) | 5 (22) | 7 (33) | 56 (19) |
| DPB1*03 | 4 (13) | 12 (13) | 9 (21) | 24 (42)** | 4 (36) | 15 (27) | 6 (26) | 4 (19) | 59 (20) |