Don't know if I agree with the word "exciting" in the title, though the article has useful info particularly if one is not up-to-date in various aspects of her2 med. A bit more info on Zenocutuzumab, a hint that it might work after CDK4/6 med.
Nguyen
The Exciting New Field of HER2-Low Breast Cancer Treatment
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7957750/