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Patient and tumor characteristics.
| Variable | (N°) |
| Patients enrolled | 16 |
| Age, median value | 72 (38–75) |
| Histology | |
| Lobular | 8 |
| Ductal | 5 |
| NST | 3 |
| Hormonal Therapy | |
| Fulvestrant | 5 |
| Letrozole | 11 |
| CDK4/6i | |
| Abemaciclib | 3 |
| Palbociclib | 5 |
| Ribociclib | 8 |
| Response at T1 | |
| PD | 5 |
| SD | 3 |
| PR | 8 |
NST: no special type; CDK4/6i: CDK4/6 inhibitors; T1: collection time after 3 months of CDK4/6i treatment; PD: disease progression; SD: stable disease; PR: partial response.
