PECAM1 and neoplasm: In tumor‐bearing regions of KrasG12D mouse lungs, ADAM17 staining was mainly detected among different epithelial cell types—club (previously known as Clara; CC10‐positive), ATII (SPC‐positive), and ATI (podoplanin‐positive) cells—CD45‐positive immune cells and, to a lesser extent, CD31‐positive endothelial cells (Fig 3A–F).