TP63 and breast carcinoma: Given the roles of ∆Np63/p40 in maintaining mammary stem/progenitor populations during normal development and in experimental breast cancers 14, 15, 16, 17, 18 and the occasional reports of pan‐p63 and ΔNp63/p40 in some non‐TNBCs 5, 9, 18, 20, 33, 34, 35, we re‐investigated p63 in human breast cancer.