Real-world Effectiveness and Safety Study of T-Dxd in Chinese Metastatic Breast Cancer

Real-world Effectiveness and Safety Study of T-Dxd in Chinese Metastatic Breast Cancer.

The aim of this trial is to explore the real-world effectiveness and poteintial predictors in Chinese metastatic breast cancer patients.

Inclusion Criteria:

1. Patients aged over 18 years old.
2. Metastatic breast cancer included unresectable locally advanced breast cancer, de novo stage IV breast cancer, and recurrent metastatic breast cancer.
3. Plan to receive or has received Trastuzumab Deruxtecan monotherapy
4. Available medical history.

Exclusion Criteria:

1. Incomplete medical history.
2. Pregnancy or breast-breeding