Table 3. RFS according to tumor shrinkage rate.
| Tumor Shrink Rate | Taxane 4y RFS (n) |
Anthracycline 4y RFS (n) |
p value | HR | 95%CI |
|---|---|---|---|---|---|
| Sensitive | |||||
| ≥75% | 92%(63) | 79%(28) | 0.046 | 0.37 | 0.126-0.886 |
| ≥50% | 87%(74) | 78%(60) | 0.067 | 0.44 | 0.177-1.011 |
| ≥25% | 85%(83) | 76%(75) | 0.036 | 0.414 | 0.182-0.944 |
| Insensitive | |||||
| <75% | 67%(27) | 66%(68) | 0.854 | 0.924 | 0.396-2.152 |
| <50% | 63%(16) | 61%(36) | 0.789 | 0.883 | 0.355-2.195 |
| <25% | 61%(7) | 57%(21) | 0.816 | 1.134 | 0.393-3.270 |
Tumor shrinkage rate: defined as 1 minus the ratio of tumor size on the surgical pathology report to the tumor size before neoadjuvant chemotherapy on the ultrasound report.