Both p8 and p14 of CaBP were found at elevated levels in sera of some patients with connective tissue diseases [highly elevated in rheumatoid arthritis (RA), Sjogren's syndrome (SjS), systemic lupus erythematosus (SLE), and progressive systemic sclerosis (PSS), and moderately in polymyositis or dermatomyositis (PM/DM) and mixed connective tissue disease (MCTD)].