TERT and idiopathic interstitial pneumonia: To test whether whole lung biopsy TL as measured by MMqPCR (biopsy T/S) correlates with FISH-TL of AT2 cells, we extracted DNA from biopsy sections and performed MMqPCR as described by Cawthon et al. (IPF n = 15, FIP-TERT n = 9, FIP-nonTERT n = 10) [28].