SCGB1A1 and neoplasm: Interestingly, and consistent with a bronchiolar trophism observed in previous models of Keap1 loss17, KK tumor-bearing lungs were characterized by elevated levels of EpCAM+CD104+ bronchiolar cells (Fig. 4d) and increased expression of Scgb1a1, a marker of Club cells (Supplementary Fig. 5a).