Search

Background: Upon infection activated plasma cells produce large quantities of antibodies which can lead to the emergence of a monoclonal component (MC), detectable by serum protein electrophoresis (SPEP). This study aims to investigate any correlation between SARS‐CoV‐2 infection and MC development and, if identified, whether it persists during follow‐up. Methods: SPEPs of 786 patients admitted to hospitals between March 01 2020 and March 31 2022 were evaluated. Positive (SARS‐CoV‐2+) and negative (SARS‐CoV‐2−) patients to nasopharyngeal swab for SARS‐CoV‐2 by RT‐PCR were included. The persistence/new occurrence of MC was investigated for all patients during follow‐up. Patient groups were compared by chi‐square analysis. Results: MC was identified in 12% of all patients admitted to hospital, of which 28.7% were SARS‐CoV‐2+. The most common immunoglobulin isotype in both groups was IgG‐k. There was no correlation between MC development and SARS‐CoV‐2 infection (p = 0.173). Furthermore, the risk of MC persistence in SARS‐CoV‐2‐negative patients was revealed to be higher than in the SARS‐CoV‐2+ at follow‐up (HR = 0.591, p = 0.05). Conclusions: Our study suggests that the detection of MC during SARS‐CoV‐2 infection is most likely due to the hyperstimulation of the humoral immune system, as also occurs in other viral infections. [ABSTRACT FROM AUTHOR]

The Italian Society of Clinical Biochemistry and Molecular Biology (SIBioC) has long promoted harmonizing activities, focusing on the laboratory reports to guarantee accuracy and comparability of the results. There is a wealth of guidelines on the clinical usefulness and diagnostic accuracy of serum protein electrophoresis (SPE), but only few provide specific recommendations for reporting and commenting the results. According to surveys and international multi-center studies, there is considerable variability between SPE reports among laboratories, which negatively impacts the management of patients with monoclonal gammopaties (MGs). This document issued by the SIBioC Study Group on Proteins, provides guidance on how to standardize and harmonize laboratory SPE reports, formulated on the basis on the available reference literature as well as on expert consensus. Each SPE report should be accompanied by a descriptive comment, mainly related to the management of samples with monoclonal components (detection, quantification and immunotyping). Examples of comments are provided. Special attention should be dedicated to samples showing a possible interference by therapeutic monoclonal antibodies (tmAb) currently used for the treatment of Multiple Myeloma (MM). Failure to detect interference due to tmAb can lead to further unnecessary diagnostic procedures or incorrect interpretations of the efficacy of treatment, such as the failure to detect a complete response to treatment in MM patients. Close collaboration between laboratory professionals and clinicians is therefore of paramount importance to provide correct information that will be useful in every step of the management of MGs patients. [ABSTRACT FROM AUTHOR]

Calprotectin (CLP) is a calcium-binding protein produced by neutrophils and monocytes in the course of inflammation. Today, the role of faecal CLP in chronic IBD is well known, but in recent years attention has shifted towards circulating CLP. In fact, this molecule can be measured in different biological fluids: blood, saliva and urine, using different analytic methods that are described in this review. Furthermore, different data confirm the relevant role of serum CLP in autoimmune diseases. In this review we will highlight the correlation between high levels of circulating CLP and specific autoantibodies of major autoimmune pathologies paving the way to the employment of CLP measurement as useful biomarker for monitoring outcome in different pathologies. [ABSTRACT FROM AUTHOR]