Pan-immune-inflammation Value (PIN) in Behçet's Disease and Its Correlation With Disease Activity

Behçet's disease (BD) is a systemic vasculitis affecting both small and large blood vessels in the venous and arterial systems. It is a multiorgan disease with various manifestations, including mucocutaneous, articular, ocular, gastrointestinal, vascular, and neurological involvements. Inflammation of the vascular wall is the primary pathophysiology contributing to thrombosis in BD. Hematological and biochemical values are altered due to systemic inflammation and aberrant immune response. Neutrophils, lymphocytes, and platelets play a significant role in systemic inflammation and thrombosis. In addition to the number and volume of peripheral cells, changes in multiple cell count ratios, such as the platelet-to-lymphocyte ratio (PLR), neutrophil-to-lymphocyte ratio (NLR), and monocyte-to-lymphocyte ratio (MLR), have become important predictors of the diagnosis, disease activity, s and severe organ damage in rheumatologic disorders. pan immune inflammation value (PIV) was first described by Fuca et al and used to evaluate the inflammation. Literature showed that PIV performed better than previous immune-inflammatory biomarkers, such as NLR in colorectal cancer patients. PIV is calculated from four blood cell counts, including neutrophils, platelets, monocytes, and lymphocytes. In some rheumatological diseases such as RA, familial Mediterranean fever, and vasculitis, PIV has been studied.

In clinical practice, hematological and inflammatory laboratory tests are easily accessible and cost-effective. It is important to determine which blood parameter will be more effective in detecting disease activity and monitoring the treatment response in BD. In our study, our aim is to investigate the association of PIN with demographics and clinical characteristics of BD patients and its correlation with disease activity.