AT Versus TP as Neoadjuvant Chemotherapy in Patients With HER2-negative Early Breast Cancer

This study intends to adopt Simon's two-stage optimal design. In stage 1, 15 HRD-positive and 15 HRD-negative patients will be recruited to receive AT or TP regimen as neoadjuvant therapy. If more than 5 patients in the HRD-positive group achieve pCR(pathological complete response) , the trial expands to stage 2, otherwise the trial terminates. In stage 2, another 31 HRD- positive and 31 HRD-negative patients will be enrolled.