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Objectives: To understand change in work productivity, activity impairment, quality of life (QoL), and disease activity in patients with psoriatic arthritis (PsA) receiving anti-tumor necrosis factor (anti-TNF) treatment., Method: One hundred twenty patients with PsA receiving anti-TNF therapy were recruited to this noninterventional, observational study. Work disability was assessed via the Work Productivity and Activity Impairment (WPAI) questionnaire and disease activity was calculated via the 28-joint Disease Activity Score using C-reactive protein (DAS28-CRP) and Disease Activity Index for Psoriatic Arthritis with 28 joints (DAPSA28) score. Patient-reported outcomes (PROs), from visual analog scores and Health Assessment Questionnaire-Disability Index scores, were evaluated to understand the clinical effectiveness at baseline and every 3 months until the month-9 final visit. The American College of Rheumatology (ACR)20/50/70 response criteria were assessed at month 9., Results: A total of 120 patients (females, n = 73) were enrolled in the study. Mean (SD) age and disease duration were 41.6 ± 11.1 years and 6.9 ± 6.5 years, respectively. The most commonly used TNFα inhibitor was adalimumab (42.4%), followed by etanercept (25.8%). All WPAI questionnaire parameters were reduced at the follow-up visits compared with baseline (p < 0.001 for all). PROs and disease activity indicators (DAS28-CRP and DAPSA28) significantly improved during the course of anti-TNF treatments (p < 0.001 for all). Additionally, ACR20/50/70 responses were determined as 86.8%, 63.7%, and 41.8% of patients at the month-9 visit., Conclusions: The real-world data in PsA patients receiving anti-TNF treatment showed improvement in WPAI, QoL, and disease activity over 9 months of treatment., Trial Registration: NCT02028169 Key Points • Psoriatic arthritis (PsA), with debilitating effects on quality of life, occurs mostly in young adults and has negative impacts on employment status and work productivity. • Early PsA diagnosis and treat-to-target treatment strategies aim to reduce pain and joint damage, as well as improve work productivity. • Real-world data on the impact of treatment with anti-tumor necrosis factor (anti-TNF) agents on work productivity in PsA in the literature is scarce. • Our study of real-world data in patients with PsA receiving anti-TNF treatment showed improvement in work productivity, as well as in clinical and patient-reported outcomes., (© 2021. International League of Associations for Rheumatology (ILAR).)

Psoriatic arthritis (PsA) may affect different joints, including the spine. The prevalence of spinal involvement is variable depending on the definition and a subset of patients have been identified in cohorts that do not have clinical features of axial disease and yet have imaging findings. Still, there is not a consensus on how and when to screen axial disease. In this study, we aimed to investigate factors associated with being underdiagnosed for axial psoriatic arthritis (axPsA) and its impacts on outcomes. Disease features and outcomes of axPsA according to the physician (n = 415) were compared with patients with imaging findings only (sacroiliitis fulfilling the modified New York criteria, n = 112), using data from a real-life PsA registry. Patients with imaging findings only were more frequently women (83/220 (37.7%) vs 29/122 (23.8%); p = 0.008). This group also had higher peripheral disease activity (imaging only vs clinical AxPsA: mean (SD) tender joint count 5.3 (6.1) vs 3.3 (4.7), swollen joint count 1.9 (2.9) vs 1.2 (2.4); p < 0.001 for both comparisons) and was less often treated using TNF inhibitors (16.1 vs 38.2%; p < 0.001) than patients who were classified as axPsA. Patient-reported outcomes were similar in both groups. PsA patients, especially women with more severe peripheral disease, have a higher risk of being underdiagnosed for axPsA. The severity of peripheral symptoms may be a risk factor to mask the spinal features of PsA.

It was aimed to evaluate KL-6 glycoprotein levels to determine if it may be a diagnostic marker for the connective tissue diseases (CTDs) predicting CTD-related interstitial lung diseases (ILDs) (CTD-ILD) development and to examine if there was a difference between patients and healthy controls. The study included 113 patients with CTD (45 CTD without lung involvement, 68 CTD-ILD) and 45 healthy control subjects. KL-6 glycoprotein levels were analyzed with ELISA in patients and the control group. The relationship between KL-6 glycoprotein levels and CTD-ILD was assessed. In the comparison of all the groups in the study, significantly higher levels of KL-6 were determined in the CTD-ILD group than in either the CTD without pulmonary involvement group or the healthy control group (p < 0.008 and p < 0.001, respectively). There was no statistically significant difference between the KL-6 levels in the healthy control group and the CTD without pulmonary involvement group (p = 0.289). The KL-6 levels did not differ significantly according to the connective tissue diseases in the diagnostic groups (systemic lupus erythematosus, Sjögren's syndrome, rheumatoid arthritis, mixed connective tissue disease, scleroderma, polymyositis/ dermatomyositis). In the healthy control group, there was a statistically significant difference between KL-6 levels in smokers and non-smokers. Smokers had significantly higher serum KL-6 levels compared with non-smokers (p < 0.05). There was no statistically significant difference between smoking status (pack-year) and serum KL-6 levels. There was no statistically significant correlation between serum KL-6 levels and time since diagnosis of CTD and CTD-ILD. The level of KL-6 as a predictive factor could be used to identify the clinical development of ILD before it is detected on imaging modality. Further prospective clinical studies are needed to define whether levels of KL-6 might have prognostic value or might predict progressive ILD.