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Research Article: Serum IL-32? as a biomarker for remission assessment in systemic lupus erythematosus

Date Published: 2026-08-05

Abstract:
To investigate the potential of serum interleukin (IL)-32? levels as a biomarker for assessing lupus low disease activity state (LLDAS) and remission, the targets of a treat-to-target strategy, in patients with systemic lupus erythematosus (SLE). We analyzed sera from 40 patients with SLE. Serum IL-32? levels were measured using an enzyme-linked immunosorbent assay, alongside conventional serologic markers (C3, C4, anti-double-stranded DNA antibody). Disease status was classified according to LLDAS, definition of remission in SLE (DORIS) remission, and glucocorticoid (GC)-free remission. Correlations with SLE disease activity index 2000 (SLEDAI-2K) were examined using Spearman’s rank correlation coefficient, and receiver operating characteristic (ROC) curve analyses were performed to evaluate discriminative accuracy for disease state. Serum IL-32? levels correlated significantly with SLEDAI-2K (rho=0.401, p=0.010), as did the conventional serologic markers. In ROC analyses, IL-32? was statistically significant in discriminating LLDAS (area under the curve [AUC]=0.728, p=0.014), similar to the other conventional serologic markers. However, for more stringent definitions, IL-32? was the only serologic marker that retained statistical significance (DORIS remission: AUC = 0.785, p=0.014; and GC-free remission: AUC = 0.831, p=0.007). Serum IL-32? is significantly associated with overall disease activity and shows promising discriminatory ability for disease states in SLE. Notably, it retains discriminative capacity in stringent remission definitions, underscoring its potential as a novel biomarker. These findings suggest that IL-32? could complement existing tools in treat-to-target strategies, offering a simple serologic marker to guide therapy toward the ultimate goal of GC-free remission.

Introduction:
To investigate the potential of serum interleukin (IL)-32? levels as a biomarker for assessing lupus low disease activity state (LLDAS) and remission, the targets of a treat-to-target strategy, in patients with systemic lupus erythematosus (SLE).

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