My take:
- we don’t treat metastatic disease to shrink the tumor, but to prolong OS and maintain/improve QoL
- that said, some patients with HER2 do get cured. Could longer T-DXd increase that rate? TBD
- shared decision making is KEY to personalize the duration of 1L T-DXd/P!!
This analysis is powerful: patients who reach CR do so at ~8.4 months, stay on T-DXd for ~28 months, and many responses are still ongoing at cutoff. This really makes us question whether T-DXd needs to be continued beyond CR or deep PR, or if we should transition to a more easily tolerated maintenance approach instead. Ongoing trials like DIMITHER and other induction-maintenance studies will help answer this.