Study of Irinotecan Liposome Injection in Patients With Advanced Breast Cance

This is an open-label, single-arm, phase I study with a dose-escalation phase (part 1) and a dose-expansion phase (part 2). In part 1, patients will receive irinotecan liposome injection (CSPC) at the initial starting dose until progression or unacceptable toxicity. Dosages will be escalated by certain increments in subsequent cohorts. Once the appropriate dose has been established in part 1, patients will be enrolled into two expansion cohorts in part 2.