H6PD and breast carcinoma: We used the TNBC line MDA-MB-231 as a model system for the generation of a cell clone stably expressing H6PD-BirA*-HA because of our interest to start elucidating the role of H6PD and the luminal PPP in breast cancer cells and due to the absence of endogenous 11β-HSD1 expression in these cells.