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Real-world data are crucial to continuously improve the management of patients with rheumatic and musculoskeletal diseases (RMDs). The German RheumaDatenRhePort (RHADAR) registry encompasses a network of rheumatologists and researchers in Germany providing pseudonymized real-world patient data and allowing timely and continuous improvement in the care of RMD patients. The RHADAR modules allow automated anamnesis and adaptive coordination of appointments regarding individual urgency levels. Further modules focus on the collection and integration of electronic patient-reported outcomes in between consultations. The digital RHADAR modules ultimately allow a patient-centered adaptive approach to integrated medical care starting as early as possible in the disease course. Such a closed-loop system consisting of various modules along the whole patient pathway enables comprehensive and timely patient management in an unprecedented manner.

Background: Durable vaccine-mediated immunity relies on the generation of long-lived plasma cells and memory B cells (MBCs), differentiating upon germinal center (GC) reactions. SARS-CoV-2 mRNA vaccination induces a strong GC response in healthy volunteers (HC), but limited data is available about response longevity upon rituximab treatment. Methods: We evaluated humoral and cellular responses upon 3rd vaccination in seven patients with rheumatoid arthritis (RA) who initially mounted anti-spike SARS-CoV-2 IgG antibodies after primary 2x vaccination and got re-exposed to rituximab (RTX) 1-2 months after the second vaccination. Ten patients with RA on other therapies and ten HC represented the control groups. As control for known long-lived induced immunity, we analyzed humoral and cellular tetanus toxoid (TT) immune responses in steady-state. Results: After 3rd vaccination, 5/7 seroconverted RTX patients revealed lower anti-SARS-CoV-2 IgG levels but similar neutralizing capacity compared with HC. Antibody levels after 3rd vaccination correlated with values after 2nd vaccination. Despite significant reduction of circulating total and antigenspecific B cells in RTX re-exposed patients, we observed the induction of IgG+ MBCs upon 3rd vaccination. Notably, only RTX treated patients revealed a high amount of IgA+ MBCs before and IgA+ plasmablasts after 3rd vaccination. IgA+ B cells were not part of the steady state TT+ B cell pool. TNF-secretion and generation of effector memory CD4 spike-specific T cells were significantly boosted upon 3rd vaccination. Summary: On the basis of pre-existing affinity matured MBCs within primary immunisation, RTX re-exposed patients revealed a persistent but atypical GC immune response accompanied by boosted spike-specific memory CD4 T cells upon SARS-CoV-2 recall vaccination. [ABSTRACT FROM AUTHOR]

Objective: Autoantibodies against CD74 (anti‐CD74) are associated with ankylosing spondylitis (AS). The present multicenter study, the International Spondyloarthritis Autoantibody (InterSpA) trial, was undertaken to compare the sensitivity and specificity of anti‐CD74 and HLA–B27 in identifying patients with nonradiographic axial spondyloarthritis (axSpA). Methods: Patients ages 18–45 years with inflammatory back pain of ≤2 years' duration and a clinical suspicion of axSpA were recruited. HLA–B27 genotyping and magnetic resonance imaging of sacroiliac joints were performed in all patients. One hundred forty‐nine patients with chronic inflammatory back pain (IBP) not caused by axSpA served as controls, and additional controls included 50 AS patients and 100 blood donors whose specimens were analyzed. Results: One hundred patients with inflammatory back pain received a diagnosis of nonradiographic axSpA from the investigators and fulfilled the Assessment of SpondyloArthritis international Society (ASAS) criteria. The mean age was 29 years, and the mean symptom duration was 12.5 months. The sensitivity of IgA anti‐CD74 and IgG anti‐CD74 for identifying the 100 axSpA patients was 47% and 17%, respectively. The specificity of both IgA anti‐CD74 and IgG anti‐CD74 was 95.3%. The sensitivity of HLA–B27 was 81%. The positive likelihood ratios were 10.0 (IgA anti‐CD74), 3.6 (IgG anti‐CD74), and 8.1 (HLA–B27). Assuming a 5% pretest probability of axSpA in chronic back pain patients, the posttest probability, after consideration of the respective positive test results, was 33.3% for IgA anti‐CD74, 15.3% for IgG anti‐CD74, and 28.8% for HLA–B27. A combination of IgA anti‐CD74 and HLA–B27 results in a posttest probability of 80.2%. Conclusion: IgA anti‐CD74 may be a useful tool for identifying axSpA. The diagnostic value of the test in daily practice requires further confirmation. [ABSTRACT FROM AUTHOR]

Background: Durable vaccine-mediated immunity relies on the generation of long-lived plasma cells and memory B cells (MBCs), differentiating upon germinal center (GC) reactions. SARS-CoV-2 mRNA vaccination induces a strong GC response in healthy volunteers (HC), but limited data is available about response longevity upon rituximab treatment., Methods: We evaluated humoral and cellular responses upon 3rd vaccination in seven patients with rheumatoid arthritis (RA) who initially mounted anti-spike SARS-CoV-2 IgG antibodies after primary 2x vaccination and got re-exposed to rituximab (RTX) 1-2 months after the second vaccination. Ten patients with RA on other therapies and ten HC represented the control groups. As control for known long-lived induced immunity, we analyzed humoral and cellular tetanus toxoid (TT) immune responses in steady-state., Results: After 3 rd vaccination, 5/7 seroconverted RTX patients revealed lower anti-SARS-CoV-2 IgG levels but similar neutralizing capacity compared with HC. Antibody levels after 3rd vaccination correlated with values after 2nd vaccination. Despite significant reduction of circulating total and antigen-specific B cells in RTX re-exposed patients, we observed the induction of IgG+ MBCs upon 3 rd vaccination. Notably, only RTX treated patients revealed a high amount of IgA+ MBCs before and IgA+ plasmablasts after 3 rd vaccination. IgA+ B cells were not part of the steady state TT+ B cell pool. TNF-secretion and generation of effector memory CD4 spike-specific T cells were significantly boosted upon 3 rd vaccination., Summary: On the basis of pre-existing affinity matured MBCs within primary immunisation, RTX re-exposed patients revealed a persistent but atypical GC immune response accompanied by boosted spike-specific memory CD4 T cells upon SARS-CoV-2 recall vaccination., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Stefanski, Rincon-Arevalo, Schrezenmeier, Karberg, Szelinski, Ritter, Chen, Meisel, Jahrsdörfer, Ludwig, Schrezenmeier, Lino and Dörner.)

Objectives: To capture comorbidity and medication of persons with Sjögren's syndrome (SS) in a population-based cohort in comparison to matched controls., Methods: Individuals with an outpatient diagnosis of M35.0 (ICD-10) in ≥2 quarters of a year or an inpatient diagnosis of M35.0 were identified in a German statutory health insurance fund covering 7.2 million people. Persons in rheumatologic care were grouped by incident or prevalent diagnosis and by co-existing autoimmune disease (sSS) or primary (p)SS and compared to age- and sex-matched controls regarding comorbidity (ICD-10), medical prescriptions, hospitalisation and inability to work in the previous year., Results: In 2018, 7,283 persons (0.10%) had incident and 54,273 persons (0.75%) prevalent SS diagnosis, and 5,961 (11%) were in rheumatologic care. Of these (90% female, mean age 66 years), 3,457 (58%) had further autoimmune disease (sSS), mostly rheumatoid arthritis (80%) and systemic lupus erythematosus (13%). Compared to controls, frequent comorbid conditions in SS were hypertension (controls: 52%, pSS: 55%, sSS: 63%), osteoarthritis (22%/40%/47%), osteoporosis (10%/26%/38%) and depression (21%/34%/36%). Systemic antirheumatic drugs were prescribed in 31% (pSS) and 66% (sSS) while < 5% received topical therapies. Glucocorticoids (8%/34%/59%), NSAIDs (28%/41%/45%), opioids (8%/15%/21%), analgesics (19%/30%/36%) and antidepressants (14%/21%/21%) were frequently prescribed. Compared to controls, hospitalisation (21%/32%/39%) and inability to work in persons <65 years (41%/48%/44%, median days 17/24/30) were more frequent in pSS and sSS than in controls., Conclusions: SS claims diagnosis is associated with substantial comorbidity and frequent prescription of anti-inflammatory drugs, analgesics and antidepressants. The individual and societal burden of SS shows that, in addition to effective treatment strategies, intensive attention to comorbidities is important in this disease.