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Treat to target describes a management paradigm that involves choosing a clinically relevant target, assessment with validated measures at a prespecified frequency, and a change in therapy if the target is not met. Although guidelines recommend treating to target in axial spondyloarthritis (axSpA), ideal methods to reach this target remain controversial. This review focuses on background for a treat-to-target strategy in axSpA. Potential targets of treatment, association of targets with outcomes, evidence of treatment impact on outcomes, and how treat to target has been incorporated into treatment guidelines are discussed. https://www.selleckchem.com/products/favipiravir-t-705.html Treat-to-target trials and the research agenda for studies in axSpA are discussed. Published by Elsevier Inc.Axial involvement in psoriatic arthritis is a well-recognized manifestation with a prevalence between 12.5% and 78%. This huge heterogeneity is due to the different criteria used by authors to define psoriatic arthritis with axial involvement combining clinical features with radiographic evidence of disease. Specific genetic and clinical attributes of axial psoriatic arthritis might differentiate it from axial spondyloarthritis with concurrent skin psoriasis. Few studies address the specific management. The purpose of this review is to acknowledge the current understanding of axial involvement in psoriatic arthritis and highlight the need for a definition to facilitate research and clinical recognition. Targeting clinical remission is currently the focus of the treat-to-target strategy. Defining clinical outcomes as the main achievable treatment goal questions whether imaging remission should also be considered in the treat-to-target concept. Imaging has gained a pivotal role in diagnosing and classifying axial spondyloarthritis at the earliest phase of the disease. Its importance has been expanded to monitoring and prognosticating spondyloarthritis. This article summarizes current evidence on the use of imaging for monitoring disease activity and predicting treatment response in axial spondyloarthritis, and discusses the concept of imaging-driven treat-to-target strategy with a highlight on the newest imaging modalities in spondyloarthritis. This article discusses the current position of conventional radiography and MRI, the techniques recommended by the European League Against Rheumatism for use in imaging in axial spondyloarthritis (axSpA). Several challenges and areas of development regarding radiography and MRI in axSpA are considered. Also, a few interesting focus points for future research are noted. Besides the recommended techniques, this article discusses several nuclear imaging techniques and the usability of these techniques in daily practice. Imaging of the sacroiliac joint plays a critical role in the classification of patients with axial spondyloarthritis. New imaging techniques are emerging, changing the way clinicians look at the sacroiliac joint. https://www.selleckchem.com/products/favipiravir-t-705.html This article introduces the novel techniques in imaging of spondyloarthritis, including dual-energy computed tomography and new MRI sequences, with a focus on the imaging of bone marrow edema and erosions of the sacroiliac joint. To adequately and efficiently evaluate patients with gastrointestinal symptoms in the context of axial spondyloarthritis can be difficult, considering that many of these patients suffer from chronic pain, present high inflammatory parameters, and use drugs with possible gastrointestinal adverse effects. In addition, the immunosuppressive treatments that these patients can receive make it necessary to always consider infections within the differential diagnoses of inflammatory bowel disease. In this article, we propose a practical approach to patients diagnosed with axial spondyloarthritis and suspected inflammatory bowel disease. Spondyloarthritis (SpA) is a chronic inflammatory condition that can have a predominately peripheral or axial presentation. Axial SpA (axSpA) affects the axial skeleton with either radiographic (r-axSpA) or nonradiographic (nr-axSpA) changes. Radiographic changes are a late disease feature and earlier disease stages can be identified by incorporating other imaging methods. The diagnosis of axSpA is a clinical diagnosis and classification criteria are not aimed to be diagnostic tools. The split between r-axSpA and nr-axSpA is artificial and we should move toward the unifying concept of axSpA. Our understanding of genetics, biomarkers, and immunopathophenotypes will drive further refinement of classification criteria. This article provides an overview of juvenile spondyloarthritis and important differences in the classification criteria, clinical presentation, outcomes, and pathology in juvenile versus adult-onset disease. Key differences in classification criteria between children and adults with spondyloarthritis are important to understand, as they can make transition from pediatric to adult care challenging. MRI and ultrasonography are increasingly relied on for the assessment of adult-onset disease activity and change over time in the pediatric population. The unique features of the maturing axial and peripheral skeleton are described for each modality, as they are key to understand for accurate interpretation of pathology in the pediatric population. Human leukocyte antigen (HLA) B27 is the key laboratory parameter for axial spondyloarthritis (axSpA). Its prevalence is variable across different geographic zones and ethnicities, and often mirrors the prevalence of axSpA. HLA-B27 plays a role in axSpA physiopathology. It is correlated with spondyloarthritis phenotype with a consistent positive association with family history, early disease onset, shorter diagnostic delay, hip involvement, and acute anterior uveitis. HLA-B27 has a pivotal role in many referral strategies. However, these strategies were developed in European populations and need to be evaluated in populations with lower HLA-B27 background prevalence, and where additional parameters might be needed. Spondyloarthritis, although primarily a joint-centered disease, is associated with extra-articular features, such as gut inflammation, psoriasis, and/or uveitis. Evidence points to underlying genetic predisposing factors and/or environmental factors. This is most clear in the gut, with progress through 16S and metagenomics sequencing studies and the results of functional studies in preclinical arthritis models. Translation of these findings to the clinic is making progress based on encouraging results of fecal microbial transplant studies in several human diseases. This review elaborates on novel trends in host-microbial interplay in spondyloarthritis, focusing on microbiota, immune dysregulation, and disease progression, and modulation by HLA-B27.