Abstract: Objective: Systemic sclerosis (SSc) is a complex disorder of unknown etiology. The purpose of this study was to evaluate fibroblast growth factor-23 (FGF-23) serum levels in women with SSc compared with healthy controls and to examine a possible association between FGF-23 serum levels with the presence of calcinosis in SSc patients. Methods: This cross-sectional study was performed in San Cecilio Hospital, Granada (Spain) from November 2017 to May 2019. Sixty-two women with SSc and 62 age and sex matched healthy controls were included in this study. FGF-23 serum concentration was evaluated by indirect enzyme-linked immunosorbent assay (ELISA). Results: There was no significant difference in FGF-23 levels between SSc patients and healthy controls (78.2 ± 60.5 vs. 80.3 ± 56.3 pg/mL, p= 0.662). Regarding the characteristics of the disease, we found a relationship between the values of FGF-23 and the presence of calcinosis. The levels of FGF-23 are higher in patients suffering from calcinosis (p= 0.028). Conclusion: We observed the presence of higher levels of serum FGF-23 in SSc female patients with calcinosis. Therefore, FGF-23 could be a possible therapeutic target for future treatments.

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