SMAD2 and systemic sclerosis: The major results of our high-multiplexing autoantibody screening of 55 plasma samples from SSc patients and 52 controls by means of antigen arrays showed 11 autoantibodies with increased prevalence in SSc patients compared to controls, eight of which bound to fibrosis-associated proteins: PIP4K2B, VEGFB, AKT2, AKT3, SMAD2, SERPINB13, IL31, and CTGF.