 The study found that axial psoriatic arthritis, XPSA, differs from axial spondylarthritis, XSPA+, in terms of age, gender, and presence of HLA-B27. Patients with XPSA were older, more often female, and less likely to have HLA-B27 compared to those with XSPA+, so. Additionally, peripheral manifestations were more prevalent in XPSA patients, while uveitis and inflammatory bowel disease were more common in XSPA+, so patients. The burden of disease was also similar between XPSA and XSPA+, so patients. This suggests that XPSA and XSPA+, so may be two separate conditions, and that treatment for XPSA should not be extrapolated from XSPA+, so studies. This article was authored by Frank Behrens, Hans Martin Lorenz, and Joss Strangfeld, and others.