OBJECTIVEElevated polyclonal serum immunoglobulin free light chains (FLCs; combined FLCk+FLCl [cFLC]) are associated with adverse clinical outcomes and increased mortality; we investigated cFLC and cardiovascular disease (CVD) events in type 2 diabetes.
RESEARCH DESIGN AND METHODSIn a cohort study of 352 south Asian patients with type 2 diabetes, serum cFLC, high-sensitivity C-reactive protein (hsCRP), and standard biochemistry were measured. CVD events over 2 years were recorded and assessed using multiple logistic regression.
RESULTScFLC levels were elevated significantly in 29 of 352 (8%) patients with CVD events during 2 years of follow-up (50.7 vs. 42.8 mg/L; P = 0.004). In multivariate analysis, elevated cFLC (>57.2 mg/L) was associated with CVD outcomes (odds ratio 3.3 [95% CI 1.3-8.2]; P = 0.012) and remained significant after adjusting for age, albumin-to-creatinine ratio, diabetes duration, or treatment.CONCLUSIONS cFLC elevation is a novel marker for CVD outcomes in type 2 diabetes that warrants further investigation.Predicting risk of cardiovascular disease (CVD) in type 2 diabetes (1-3) using algorithms achieves only moderate performance particularly in different ethnic populations (3). An association between increased polyclonal combined immunoglobulin free light chain (cFLC, summated FLCk+FLCl) concentrations and increased allcause mortality has been reported (4,5); we assessed the potential of cFLC as a marker of CVD outcomes in south Asian patients with type 2 diabetes.
RESEARCH DESIGN AND METHODSThe United Kingdom Asian Diabetes Study was a cluster-randomized controlled trial aimed at reducing cardiovascular risk in south Asian patients with type 2 diabetes (6-8). The current study included 352 south Asian patients whose baseline fasting serum samples were available. Detailed clinical history including treatment, CVD history at baseline and over 2 years of follow-up, plus serum biochemistry at baseline (HbA 1c , lipids, and albumin-to-creatinine ratio [ACR]) were obtained. Serum cFLC (Freelite; The Binding Site Group Ltd, Birmingham, U.K.) and hsCRP (Siemens, München, Germany) levels were measured.