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Objective: To evaluate sera titers for antibodies anti-cyclic citrullinated peptide and their correlation against sera levels of antitopoisomerase I and anti-centromere antibodies in Mexican patients with systemic sclerosis. Patients and methods: Consecutive outpatients with systemic sclerosis who attending to rheumatology clinic at a second level hospital facility. The antibodies anti-cyclic citrullinated peptide, anti-topoisomerase I and anti-centromere were determined by enzymatic immunoassay (ELISA). Statistical analysis: Spearman for correlation between numerical variables with nonparametric distribution. Fisher exact test or χ2 to compare proportions and Student t test for dimensional variables. Results: Thirty female patients were included; aged 53 ± 13, the disease duration at the time of the study was 10 ± 9. Twenty-three patients (77%) exhibited diffuse disease. Anti-centromere, anti-topoisomerase I, and anti-cyclic citrullinated peptide were detected in nine, nine and three patients respectively. The correlation analysis showed the independence of autoantibodies anti-centromere and anti-topoisomerase I with respect to the levels of anti-cyclic citrullinated peptide. Conclusions: This study confirms the low frequency of anti-cyclic citrullinated peptide antibodies in patients with systemic sclerosis. A lack of correlation between autoantibodies considered as "mutually excluded" anti-topoisomerase I and anti-centromere, indicating that the analysis of the relevance for anti-cyclic citrullinated peptide in systemic sclerosis must include other clinical and serological variables. [ABSTRACT FROM AUTHOR]