Comparison of Effect on Sicca Symptoms of Anticentromere Antibody–positive Sjögren Syndrome and Primary Sjögren Syndrome Alone

OBJECTIVE: To determine whether positive anticentromere antibody (ACA) serology affects the severity of sicca symptoms in patients with primary Sjögren syndrome (pSS). METHODS: Evaluation to detect subjective and objective sicca symptoms included questionnaires, physical examination, and pathology. Cases of pSS were classified according to the 2002 American-European Consensus Group (AECG) criteria. All patients were evaluated for presence of anti-Ro, anti-La, and ACA serology. Patients with pSS were categorized into ACA+ SS and ACA-SS. The groups were compared for measures of severity of oral and ocular sicca. RESULTS: The pSS group had 446 patients, of whom 26 were ACA+ SS. Subjective ocular sicca measured 7.0 ± 2.4 (out of 10) in ACA+ SS and 6.4 ± 2.6 in ACA-SS (p = 0.197). Objective ocular sicca measured 3.2 mm ± 1.8 mm/5 min in ACA+ SS and 4.2 mm ± 4.4 mm/5 min in ACA-SS (p = 0.038). Subjective oral sicca measured 8.5 ± 1.4 in ACA+ SS and 6.7 ± 2.4 in ACA-SS (p < 0.001). Objective oral sicca measured 0.1 ml ± 0.2 ml/15 min in ACA+ SS and 0.4 ml ± 1.0 ml/15 min in ACA-SS (p < 0.001). Only 35% of ACA+ patients with SS were anti-Ro-positive or anti-La-positive compared with 77% of the ACA-patients with SS (p < 0.001). There was no significant difference in minor salivary gland fibrosis or focus scores between ACA+ SS and ACA-patients with SS. CONCLUSION: ACA+ SS is associated with more severe objective ocular sicca and more severe subjective and objective oral sicca compared to ACA-SS. The majority of ACA+ patients with SS meet AECG criteria for pSS despite negative serology for anti-Ro/La antibodies.