Systemic sclerosis & Raynaud's

Longitudinal assessment of circulating fibroblast activation protein in systemic sclerosis-associated interstitial lung disease

Arthritis Res TherPublished Cohort study

Authors' conclusion

In conclusion, cFAP does not seem useful as a biomarker in SSc-ILD.

Study context

Population
Patients with systemic sclerosis (SSc) with and without ILD; Circulating FAP (cFAP) measured in plasma by ELISA
Participants
210 patients
Exposure
SSc with ILD vs SSc without ILD
  • SSc-ILDn = 63
  • SSc without ILDn = 147reference
Outcome
cFAP concentrations in baseline and repeated longitudinal samples, SSc with vs without ILD
Follow-up
Baseline and
Methodological detailslongitudinal, exploratory analysis of clinical features and all-cause mortality
  • Longitudinal
  • Exploratory analysis of clinical features and all-cause mortality

Main finding

As reported in the abstract

Baseline cFAP

P = 0.80

Observational data: associations, not effects.

Further findings

OutcomeP value
Baseline cFAP by skin score (mRSS ≥ 10 vs mRSS < 10)cFAP elevated with higher skin scoresP = 0.01

cFAP at baseline and ILD progression · 1, 2 and 5 years

No association between baseline cFAP and ILD progression

cFAP and all-cause mortality · 5 and 10 years

No association between cFAP and all-cause mortality

Original publication

Longitudinal assessment of circulating fibroblast activation protein in systemic sclerosis-associated interstitial lung disease. Arthritis Res Ther. Published 29 September 2025. doi:10.1186/s13075-025-03656-y

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