NFKB1 and COVID-19: Expression profiling showed disease-specific regulation, with reciprocal modulation of the two isoforms in COVID-19 and selective upregulation of p65 iso5 Δ6/7 in liver cirrhosis.<h4>Discussion</h4>These findings uncover a previously unrecognized layer of NF-κB/GR crosstalk and identify a new class of dexamethasone-binding proteins outside the nuclear receptor superfamily.