Can anyone explain rates/stats with AIs and hormone therapy

My oncologist explained today that doing AIs for 10 years lowers your risk of recurrence and even after you’ve gone off the AIs you risk remains lowered. So having hormones 10 years after AIs is less risky. I know I should’ve just asked her to clarify, but it was a bit of a whirlwind. How does this make sense, does anyone know?