Tocilizumab treatment for SARS-CoV2 Pneumonia:report of a single centre real-life experience

ABSTRACT

Background and Aim of the study Tocilizumab (TCZ), a monoclonal antibody against IL-6 receptor, has been recently employedas a treatment for SARS-Cov2-associated pneumonia (COVID),due to the central role of IL-6 on the citokyne-storm associatedhyperinflammatory syndrome. Aim of this observational retrospective study was to evaluate effectiveness and safety of TCZ for thetreatment of COVID.Materials and Methods: We retrospectively evaluated, from 16thMarch 2020 to 7th April 2020, outcomes of 16 patients affected bynasopharyngeal swab-confirmed SARS-COV-2 Pneumonia who received TCZ i.v. treatment (8 mg/kg once or twice in 12 hours). Weevaluated clinical features, Arterial Blood Gas Test (ABG), laboratoryfindings collected at baseline and after consecutive two days. Results: We analyzed 16 patients (M/F 12/4) with mean age (±SD) 69±9 years and mean disease duration 15±5 days. At baseline, mean CRP level was 14±10 mg/dl and IL-6 249±264 pg/ml.To evaluate respiratory improvement after treatment, we collectedABG data at 6,24 and 48 hours;we observed a rapid improvement of P/F ratio to 165,6±55,4 mmHg (p=0,01). We also observed a significant reduction of CRP levels to 6±6 mg/dl(p=0,0002) and a rapid increase of IL-6 serum levels to941±1317 pg/ml (p=0,05). Clinically we observed a global improvement in ten patients, while six died for infective complications. No adverse event was detected following TCZ administration.Conclusions: In our real-life experience TCZ treatment was effective and safe in a group of patients affected by SARS COV2-associated pneumonia.