Fibrinogen, Neutrophil-to-Lymphocyte rate and Platelet-to-Neutrophil Rate as Novel Acute Phase Indicators in Patients with Thromboangiitis obliterans.

Background/Objectives: The acute exacerbations and progressive deterioration seen in thromboangiitis obliterans (TAO) have been related to poor clinical outcomes. Here, we have studied the association of laboratory biomarkers with the acute phase of TAO (APTAO). Methods/Results: We conducted a retrospective case-control study on 112 patients with TAO and 98 healthy controls; comparing the neutrophil-to-lymphocyte rate (NLR), lymphocyte-tomonocyte rate (LMR), platelet-to-neutrophil rate (PNR), fibrinogen (FIB), and apolipoprotein AeI (ApoA-I). Significantly higher NLR level, as well as lower LMR, PNR, and ApoA-I levels were observed in patients with TAO, particularly the acute phase. Significantly increased FIB was only observed in AP-TAO. A positive correlation was found between NLR and with C-reactive protein (CRP) in the acute phase (r = 0.817, P < 0.001). Moreover, NLR, PNR, and FIB levels of 3.38, 45.12, and 3.69 were shown to be the predictive cut-off values for the AP-TAO (sensitivity 72.5, 82,4, and 66,7%, specificity 92.2, 78.4, and 96.1%; area under the curve [AUC] 0.875, 0.855, and 0.872), respectively. The FIB level was independently associated with the AP-TAO (OR = 11.420, P = 0.007). Conclusions: NLR, PNR, and FIB may be useful markers for the identification of inflammation and the AP-TAO. FIB may be an independent risk factor for the acute phase.