Whole phenotype of patients with systemic sclerosis and sicca manifestations: Comparison with sicca manifestations from other causes

Abstract

Introduction & objectivesThis study aimed to characterize the whole phenotype of Systemic sclerosis (SSc) patients with sicca symptoms, using major salivary glands Ultrasound (SGUS) parameters, minor salivary glands biopsies (mSGB) and clinical findings, and to compare these characteristics with those from patients with Sjogren's Disease (SjD), and patients with sicca manifestations from other causes. MethodsSixty SSc patients fulfilling the 2013 ACR/EULAR classification criteria and with subjective self-declared sicca symptoms were consecutively recruited and had SGUS and mSGB. Fifteen SSc patients without subjective sicca symptoms and 65 patients with sicca symptoms from other causes (including 37 SjD with no SSc). ResultsSSc patients with subjective sicca symptoms had frequent objective clinical (up to 83 %), histological (44 % of Focus score≥1/ mm2) and US anomalies (63 % of OMERACT ≥2). 53 % patients without subjective clinical complaint also had abnormal objective tests, suggesting the existence of a sub clinical involvement of salivary glands in SSc. SjD-SSc patients had more severe glandular involvement as compared to patients with isolated SjD and isolated Sicca-SSc patients (70%, 48,6 % and 38% of patients with OMERACT ≥2 respectively) suggesting additive impact of both diseases on glandular physiology and structure. ConclusionSjD-SSc overlap have more severe sicca features as compared to isolated sicca-SSc and isolated SjD, suggesting a specific impact of SSc on salivary gland physiology. Further translational studies are needed to identify the underlying pathways that could serve as therapeutic targets.