While CDK4/6 inhibitors improved clinical outcomes in HR+HER2- metastatic breast cancer (MBC), resistance invariably occurs. The underlying molecular mechanisms are not actionable, leaving limited therapeutic options for progressing patients. Recent data highlight a role for IL-6 in the resistance of HR+HER2- MBC to CDK4/6 inhibition, potentially opening novel avenues forward.
- Lukas Bolini
- Joyce G. Habib
- Lorenzo Galluzzi