Table 1.
P1 | P2 | P3 | P4 | FDFFSDA P5 | ||
Demographics | Sex | M | F | M | M | F |
Current age | 55 | 56 | 50 | 42 years | 60 years | |
Age at first presentation | 35 | 53 | Age 40 years—RA Age 49 years—autoinflammatory features |
40 years | 43 years | |
Autoimmune screen | ANA | − | − | − | − | − |
ACPA | + | + | + | + | − | |
RF | + | + | − | + | Positive initially | |
ANCA | - | − | Positive on one occasion, antimyeloperoxidase antibodies detected. Repeated ANCA have been negative on several occasions. | − | − | |
Genetic test | Shared epitope | DRB1*04:01 and *04:08 | DRB1*01:01 homozygous | DRB1*04:01 and *04:04 | DRB1*04:01 homozygous | DRB1*04:01 and *04:08 |
NLRP3 | c973C>T (pArg325Trp) | Nil | nil | Nil | Nil | |
MEFV | Nil | c289C>T (pGln97*), c605G>A (pArg202Gln) | nil | Nil | Nil | |
NOD2 | Nil | Nil | c2722G>C (pGly908Arg) | c2104 C>T (pArg702Trp) | Nil | |
Other investigations | Highest CRP in the absence of infection (mg/l) | 150 | 42 | 61 | 200 | 70 |
Neutrophilia | Intermittently, during uncontrolled disease episodes | Intermittently | Yes, persistently raised | Yes, during acute flares | No | |
X-ray | Mild erosive changes | Degenerative changes only | Normal, MRI showed inflammation | Degenerative changes, but no erosions | ||
Skin biopsy | Confirmed as lichen planus | Ulcerated epidermis with collections of neutrophils on the surface | Not done | Not done | Not done | |
Clinical features | Fevers | + | + | + | − | − |
Skin rash | +, confirmed as lichen planus on biopsy | + | Profound erythema at sites of synovitis | + | Erythema at sites of synovitis | |
Arthritis | + | + | + | + | + | |
Synovitis | + | + | + | + | + | |
Serositis | - | Possible—one hospital episode with symptoms consistent with meningism. A lumbar puncture aspirate was sterile. | + pericarditis, pleuritis (confirmed with echocardiogram and CT) | − | − | |
Treatment | Corticosteroids | Yes, good response | Yes, good response | Yes—good response | Yes—good response | Yes—partial response |
Colchicine | Yes, no response | Yes, partial response stopped due to side effects | Yes—good response | Yes—excellent response with normalisation of CRP | Yes—excellent clinical response | |
Methotrexate | Yes, partial response, developed RA-like flare when stopped due to intolerance | Yes, good response | Yes—partial, stopped due to intolerance | Yes—partial response | Yes—partial response | |
anti-TNF | Yes, response initially, but secondary non-response to etanarcept | No | No | No | No | |
anti-IL-6 | Yes, partial response, normalisation of CRP only | No | No | No | No | |
anti-IL-1 | Complete response to anakinra, although non-response to canakinumab | No | No | No | No | |
Other | Hydroxychloroquine, sulfasalazine | Sulfasalazine—partial response | Sulfasalazine, hydroxychloroquine—partial response |
ACPA, anticitrullinated protein antibody; ANA, antinuclear antibody; ANCA, antineutrophil cytoplasmic antibody; Nil, means that no rare variants were found in these genes; RA, rheumatoid arthritis; RF, rheumatoid factor.