CALR and rheumatoid arthritis: Interestingly, the positivity for anti-Ro antibodies and anti-La antibodies in patients’ sera were significantly higher in the ‘pSS’ group, compared to the ‘RA with sSS’ group (anti-Ro antibody positivity: 100% vs. 63.2%, p = 0.008; anti-La antibody positivity: 55.6% vs. 15.8%, p = 0.017) (Table 1).