Ask HN: What is the latest on treatment of Metastatic Breast Cancer?

I was reading this recently shared post on the promise of CAR-T therapy for cancer[1]. However, it seems that it may not be universally applicable to all cancers[2], including breast cancer.

What have we discovered (and made available as treatment) for advanced breast cancers?

[1]: https://news.ycombinator.com/item?id=44219379 [2]: https://pmc.ncbi.nlm.nih.gov/articles/PMC8990477/