They report a population of BCs, aberrant BCs, unique to IPF that express BC markers TP63, cytokeratin 17 (KRT17), laminin subunit beta-3 (LAMB3), and laminin subunit gamma-2 (LAMC2), but also lack other accepted BC markers such as KRT5 and KRT15 (Adams et al., 2020). This evidence concerns the gene KRT5 and breast cancer.