IL33 and rheumatoid arthritis: There are mainly three expression forms of ST2: a full‐length transmembrane form (ST2L), a soluble form (sST2), and a novel variant.12 The IL‐33‐ST2 axis is implicated in the pathogenesis of a variety of conditions, including asthma, rheumatoid arthritis, and Alzheimer's disease.13, 14, 15 In the field of hepatology, the characteristics of the IL‐33‐ST2 axis have been extensively studied.