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Objectives To derive and validate a definition of low disease activity (LDA) for systemic lupus erythematosus (SLE) based on the SLE Disease Activity Score (SLE-DAS), in a real-life multicentre cohort of SLE patients. Methods Derivation was conducted using data from a monocentric cohort of SLE (Portugal), and validation was performed in a multicentre cohort (Italy, France, and Spain). The Lupus Low Disease Activity State (LLDAS) was used as comparator. We applied receiver operating characteristics (ROC) curve analysis against the LLDAS to determine the cut-off of SLE-DAS for LDA using bootstrap methodology. In a second step, we tested a definition of SLE-DAS LDA that included: (i) the statistically derived SLE-DAS upper threshold for LDA, and (ii) prednisone dose ≤7.5 mg/day. In the multicentre validation cohort, we assessed the classification performance of this SLE-DAS LDA definition. Results We included 774 patients, 300 in the derivation and 474 in the validation cohorts, respectively. In the derivation cohort, the optimal cut-off to identify patients in LLDAS was SLE-DAS ≤2.48, presenting an area under the curve (AUC) of 0.965 (95%CI 0.935–0.994). When applied to the multicentre validation cohort, the SLE-DAS LDA definition showed a sensitivity of 97.1% and a specificity of 97.7% for LLDAS and an almost perfect agreement (Cohen’s Kappa =0.933; p< 0.001). McNemar’s test found no significant differences between the two definitions (p= 0.092). Conclusion The SLE-DAS LDA is a validated, accurate, and easy-to-use definition for classifying SLE patients in LDA state.

Long-term adherence to antiosteoporosis medication (AOM) in the setting of a fracture liaison service (FLS) are not well known. Patients ≥ 50 with hip fracture seen in an FLS and recommended for treatment to prevent new fractures were analyzed. Baseline data included demographics, identification mode, previous treatment and FRAX items. Patient records were reviewed 3–8 years later, and these data were collected: (1) survival; (2) major refracture; (3) initiation of treatment, proportion of days covered (PDC) and persistence with AOM. 372 patients (mean age, 79 years; 76% women) were included. Mean follow-up was 47 months, 52 patients (14%) had a refracture (22 hip) and 129 (34.5%) died. AOM was started in 283 patients (76.0%). Factors associated with initiation of AOM were previous use of bisphosphonate (OR 9.94; 95% CI 1.29–76.32) and a lower T-score lumbar (OR 0.80; 95% CI 0.65–0.99). Persistence decreased to 72.6%, 60% and 47% at 12, 36 and 60 months. A PDC > 80% was confirmed in 208 patients (55.7%) and associated with previous use of bisphosphonate (OR 3.38; 95% CI 1.34–8.53), treatment with denosumab (OR 2.69; 95% CI:1.37–5.27), and inpatient identification (OR 2.26; 95% CI 1.18–4.34). Long-term persistence with AOM was optimal in patients with hip fracture seen at an FLS. A PDC > 80% was associated with inpatient identification and prescription of denosumab.

Objectives To apply Lupus Low Disease Activity State (LLDAS) definition within a large cohort of patients and to assess the agreement between the LLDAS and the physician’s subjective evaluation of lupus activity. Methods A cross-sectional analysis of a prospective multicentre study of Systemic Lupus Erythematosus (SLE) patients. We applied the LLDAS and assessed whether there was agreement with the clinical status according to the physiciańs opinion. Results 508 patients (92% women; mean age (±SD): 50.4 years (± 13.7)). A total of 304 (62.7%) patients were in LLDAS. According to physician assessment, 430 patients (86,1%) were classified as remission or low activity. Overall agreement between both evaluations was 71.4% (95% CI: 70.1–70.5%) with a Coheńs kappa of 0.3 (0.22–0.37). Most cases (96.1%) in LLDAS were classified as remission or low activity by the expert. Of the patients that did not fulfill LLDAS, 126 (70.4%) were classified as having remission/low disease activity. The main reasons for these discrepancies were the presence of new manifestations compared with the previous visit and a SLEDAI 2-K > 4, mainly based on serological activity. Conclusions Almost two thirds of SLE patients were in LLDAS. There was a fair correlation between LLDAS and the physician's evaluation. This agreement improves for patients fulfilling the LLDAS criteria. The discordance between both at defining lupus low activity, the demonstrated association of LLDAS with better outcomes and the fact that LLDAS is more stringent than physician’s opinion imply that we should use the LLDAS as a treat to target goal.

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