Abstract
Objectives. To assess the associations of severe non-adherence to HCQ, objectively assessed by HCQ serum levels, and risks of SLE flares, damage, and mortality over 5 years of follow-up.
Methods. The SLICC Inception Cohort is an international multicenter initiative (33 centers; 11 countries). Serum of patients prescribed HCQ for at least 3 months at enrollment were analyzed. Severe non-adherence was defined by a serum HCQ level <106 ng/ml or <53 ng/ml, for HCQ doses of 400 or 200 mg/d, respectively. Associations with the risk of a flare (defined as a SLEDAI-2K increase ≥4 points, initiation of prednisone or immunosuppressive drugs, or new renal involvement) were studied with logistic regression, and associations with damage (first SLICC/ACR Damage Index (SDI) increase ≥1 point) and mortality with separate Cox proportional hazard models.
Results. Of 1849 cohort subjects, 660 patients (88% women) were included. Median (interquartile range) serum HCQ was 388 ng/ml (244–566); 48 patients (7.3%) had severe HCQ non-adherence. No covariates were clearly associated with severe non-adherence, which was however independently associated with both flare (OR 3.38; 95% CI 1.80–6.42) and an increase in the SDI within each of the first 3 years (HR 1.92 at 3 years; 95% CI 1.05–3.50). Eleven patients died within 5 years, including 3 with severe non-adherence (crude HR 5.41; 95% CI 1.43–20.39).
Conclusion. Severe non-adherence was independently associated with the risks of an SLE flare in the following year, early damage, and 5-year mortality.
Methods. The SLICC Inception Cohort is an international multicenter initiative (33 centers; 11 countries). Serum of patients prescribed HCQ for at least 3 months at enrollment were analyzed. Severe non-adherence was defined by a serum HCQ level <106 ng/ml or <53 ng/ml, for HCQ doses of 400 or 200 mg/d, respectively. Associations with the risk of a flare (defined as a SLEDAI-2K increase ≥4 points, initiation of prednisone or immunosuppressive drugs, or new renal involvement) were studied with logistic regression, and associations with damage (first SLICC/ACR Damage Index (SDI) increase ≥1 point) and mortality with separate Cox proportional hazard models.
Results. Of 1849 cohort subjects, 660 patients (88% women) were included. Median (interquartile range) serum HCQ was 388 ng/ml (244–566); 48 patients (7.3%) had severe HCQ non-adherence. No covariates were clearly associated with severe non-adherence, which was however independently associated with both flare (OR 3.38; 95% CI 1.80–6.42) and an increase in the SDI within each of the first 3 years (HR 1.92 at 3 years; 95% CI 1.05–3.50). Eleven patients died within 5 years, including 3 with severe non-adherence (crude HR 5.41; 95% CI 1.43–20.39).
Conclusion. Severe non-adherence was independently associated with the risks of an SLE flare in the following year, early damage, and 5-year mortality.
Original language | English |
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Journal | Arthritis and Rheumatology |
Early online date | 17 Jul 2023 |
DOIs | |
Publication status | E-pub ahead of print - 17 Jul 2023 |
Keywords
- Systemic lupus erythematosus
- hydroxychloroquine
- adherence
- flare
- damage