Abivertinib is a tyrosine kinase inhibitor targeted against mutant forms of both human epidermal growth factor receptor (EGFR) and Bruton's tyrosine kinase (BTK).[L17383] It has been investigated for use in the treatment of non-small cell lung cancer (NSCLC) and B-cell malignancies. In binding to and inhibiting EGFR and BTK receptors, abivertinib exerts immunomodulatory effects by preventing the production and release of pro-inflammatory cytokines (e.g. TNF-alpha, interleukins).[L17388] Abivertinib's potential to depress cytokine production has led to its investigation in the treatment of hospitalized patients with moderate-to-severe COVID-19.[L17388,L17393] The cytokine storm associated with COVID-19 is thought to contribute to disease progression and is associated with poor outcomes in patients - as abivertinib inhibits the release of multiple cytokines at once, it may provide more pronounced clinical benefits as compared to agents targeting single pathways (e.g. interleukin-6 inhibitors). The study is expected to be completed in March 2021.[L17398]