The reason that women in their 40s need to be screened every year is because their disease tends to be more aggressive. If the interval growth is faster then you need to screen those people more frequently. The message I'd say is:

  1. We know it saves lives for women in their 40s.
  2. It makes sense to get a mammogram every year in your 40s.
  3. If you're getting a mammogram in your 40s, it should be a 3D mammogram.