BACKGROUND: Higher cardiovascular risk has been largely described in rheumatoid arthritis as well as different effects of biologic agents in theses patients. The aim of present study is to analyze the effects of tumor necrosis factor inhibitors (TNFi) in the lipoprotein profile of rheumatoid arthritis (RA) patients using a broad laboratory assessment including a large number of no routine testsMETHODS: RA patients treated with and without TNFi were cross-sectionally compared regarding a broad spectrum of lipoprotein tests including serum levels of cholesterol, triglycerides, HDL, LDL and VLDL cholesterol, lipoprotein A (LpA), apolipoprotein A1 (Apo A) and B100 (Apo B), HDL, LDL and VLDL proteins, triglycerides and phospholipids, HDL Apo A, LDL and VLDL Apo B and paraoxonase 1 (PON 1), HDL, LDL and VLDL masses and number of particles of LDL and VLDL. Univariate and multivariate analyses of the different variables were performedRESULTS: Patients on treatment with TNFi showed a trend to be younger and had a longer disease duration. Regarding to the lipoprotein analyses, borderline significant higher levels of serum Apo A were detected and an independent association with lower HDL mass, LDL triglyceride, VLDL cholesterol, VLDL Apo B, VLDL mass, number of VLDL cholesterol molecules and number of particles of VLDL was clearly observed.CONCLUSIONS: TNFi treatment was associated with beneficial atherogenic effects at the lipoprotein level especially centered in VLDL related parameters consistent with a reduction of the remnant atherogenic risk.