BTK and COVID-19: There are two classes of kinase inhibitors that are FDA-approved for certain rheumatologic or oncologic indications that have also been proposed for the treatment of COVID-19: Janus Kinase (JAK) inhibitors (baricitinib, ruxolitinib, and tofacitinib) and Bruton’s tyrosine kinase (BTK) inhibitors (acalabrutinib, ibrutinib, and zanubrutinib).