Associations between family history of psoriatic disease and clinical characteristics on patients with psoriatic arthritis: a nationwide study from the Chinese Registry of Psoriatic Arthritis (CREPAR II)

The study aimed to identify clinical characteristics in Chinese patients with psoriatic arthritis (PsA) with or without a family history of psoriasis and/or PsA.Patients with PsA were recruited based on Chinese REgistry of Psoriatic ARthritis (CREPAR) between December 2018 and June 2021. The demographics, clinical information relating to PsA, laboratory variables and comorbidities were collected. The association between family history of psoriatic disease and clinical characteristics on PsA was analysed using logistic regression analysis.Among 1074 eligible patients with PsA, 313 (29.1%) had a family history of psoriasis and/or PsA. Compared with patients without a family history, notably, patients with a family history of psoriasis and/or PsA had an earlier age of onset of psoriasis and PsA, higher proportions of enthesitis and nail involvement, a higher prevalence of positive human leukocyte antigen-B27 (HLA-B27), lower disease activity score 28-erythrocyte sedimentation rate, higher proportions of hyperlipidaemia, lower proportions of hypertension and diabetes. Furthermore, after adjusting for confounding factors, logistic regression analysis demonstrated that a positive family history of psoriasis and/or PsA was associated with more females (OR 1.514, 95% CI 1.088-2.108, p=0.014), earlier age at psoriasis onset (OR 0.971, 95%CI 0.955-0.988, p=0.001), a higher prevalence of HLA-B27 (OR 1.625 95%CI 1.089-2.426, p=0.018), more presence of nail involvement (OR 1.424, 95%CI 1.007-2.013, p=0.046) and enthesitis (OR 1.393, 95%CI 1.005-1.930, p=0.046), a higher proportion of hyperlipidaemia (OR 2.550, 95%CI 1.506-4.317, p=0.001) in PsA patients.This was first nationwide study to characterize patients with and without a family history of psoriatic disease in China. The findings from the present study revealed that family history of psoriasis and/or PsA had greater effects on disease phenotypes of PsA, especially nail disease and enthesitis.