CALR and synovial sarcoma: Others autoantibodies with high prevalence in SS patients are rheumatoid factor, cryoglobulins, anticentromere antibodies (ACA), autoantibodies against cyclic citrullinated peptides (anti-CCP), calreticulin, antimitochondrial antibodies (AMA), antibodies to muscarinic receptors, autoantibodies targeting carbonic anhydrase II (anti-CAII), anti-smooth muscle antibodies (ASMA) [37], and antinuclear antibodies (ANA) are present in the sera of 59–85% of patients [38].