<b>Protein disulfide isomerase A4 as a potential biomarker and therapeutic target for coronavirus disease 2019: correlation with cytokine profiles and disease progression</b>

This study investigated the role of protein disulfide isomerase A4 (PDIA4) in the pathogenesis of coronavirus disease 2019 (COVID-19), focusing on its relationship with disease severity and potential as a therapeutic target or biomarker.