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Background In a recent clinical trail the reduction of FVC was not accompanied by a benefit with respect to health-related quality of life and patient-reported outcomes (PROs). The aim of this study is to assess how the change in Pulmonary Function Test (PFTs) parameters correlates with the patient reported outcomes (PROs) in an observational cohort of patients with systemic sclerosis (SSc). Methods We conducted a retrospective study of 330 clinic episodes from 121 unselected patients diagnosed with systemic sclerosis according to EULAR/ACR 2013 criteria, in annual follow-up (for a total of 165 patients/year) with PFTs, Health Assessment Questionnaire Disability Index (HAQ-DI), Scleroderma Health Assessment Questionnaire (sHAQ), Modified Borg Dyspnea Scale (Borg) and Cochin Hand Function Score (CHFS). We assessed the correlation between the HAQ and the Visual Analogical Scale 1-7 at baseline (VAS1 pain, VAS2 disease severity, VAS3 arthritis activity, VAS4 intestinal problems, VAS5 dyspnea, VAS6 Raynaud’s phenomenon, VAS7 digital ulcers). We evaluated the correlation of PFTs with PROs at every time period and the correlation between the change of PFTs parameters (δFVC, δDLCO) with the change of the PROs over a year of follow-up. Following analysis of distribution, Spearman or Pearson Test were used to determine correlation coefficients, as appropriate (Prism 7). Results The median disease duration was 5 years (IQR 3-10). The median of 12 months δFVC% and δDLCO% were 0 (IQR -5.81 to 3.28) and -2.439 (IQR -8.76 to 5.98), respectively. The analysis evidenced a strong positive correlation between VAS1-7 and HAQ. We observed also significant correlation between FVC%, DLCO% and HAQ-DI (r= -0.355 and -0.266, respectively; p &amp;lt; 0.0001 for both), Borg (r= -0.403 and -0.379, respectively; p &amp;lt; 0.0001) and CHFS (r = -0.355 and -0.256, respectively; p &amp;lt; 0.0001). Nevertheless, in longitudinal setting there was no significant correlation between δPROs and changes lung function, as continuous variables, neither there was any significant PROs difference in patients that did or did not lose more than 10% of FVC and DLCO over a year of follow-up. Conclusion This analysis of a monocentric non-selected population evidenced that the current commonly used PROs in SSc while showing a good correlation with lung function are poorly sensitive to change or to reflect changes in lung function over 12 months. In this sense, prudent interpretation of the lack of correlation between FVC and patient-reported outcomes in studies of phase 3 is warranted. Disclosures F. Danzo: None. K. Gjeloshi: None. G. Abignano: None. A. Dean: None. F. Masini: None. G. Cuomo: None. F. del Galdo: None.

P159 Current patient reported outcomes (PROs) poorly reflect changes in lung function in patients with systemic sclerosis