Inhibition of notch signaling via N-[N-(3,5-difluorophenacetyl-lalanyl)]-S-phenylglycine t-butyl ester (DAPT), a γ-secretase inhibitor, reduces MSC-mediated CD90 expression and growth of breast cancer cells in co-culture experiments [36, 56]. This evidence concerns the gene THY1 and breast carcinoma.