Furthermore, it is conceivable that expression patterns of ACE2 and SARS-CoV-2 host proteases in malignancies of the upper airways may be different from the patterns observed in LUAD (i.e., a cancer of the peripheral lung), and this is supported by recent studies showing the expression of ACE2 in secretory cells (such as those in the upper airway) [47,48], which we also noted in our limited cohort. Here, ACE2 is linked to cancer.