... 3Research articleAnti-Sa antibodies and antibodies against cyclic citrullinated peptide are not equivalent as predictors of severe outcomes in patients with recent-onset polyarthritisGilles Boire1, ... at inclusion and with increasing age, charac-terized a subgroup of patients with more rapid and more severe joint damage. In contrast, anti-CCP antibodies were not independently associated with ... include antibodies targeting cyclic citrullinated peptide (CCP) [20] and antibodies targeting in vivo citrullinated pro-teins, such as anti-keratin antibodies, antiperinuclear factor,anti-citrullinated...