Table 2.
Optimal threshold of the increase in breast tumour ADC-values after neoadjuvant chemotherapy for differentiating ypN0 and ypN+, determined by maximizing the Youden index
| Total | Axillary pCR | P-value | |
|---|---|---|---|
| ΔADC < 0.92 | 39 | 8 (20.5) | 0.038 |
| ΔADC > 0.92 | 35 | 15 (42.8) |
ADC, apparent diffusion coefficient.
Data are the number of patients, with percentages in parentheses. p-value of significant difference by χ2 test.
a
ADC = increase in the breast tumour ADC-values after neoadjuvant chemotherapy; pCR = pathological complete response; ypN0 = axillary complete response after neoadjuvant chemotherapy; ypN += residual axillary metastasis after neoadjuvant chemotherapy.