A 5-year milestone post #breastcancer Dx & Tx is gr8, but doesn't signify cure. Only #tnbc (triple neg) pts mght be considered safe-ish aftr 5 yrs (but no guarantees). 20% of ER+ #BC peeps will develop #MBC w/in 20 yrs frm reawakened #DTCs. Who? Why? They don't know but are trying 2 fnd out. #cansky