Table 2. The differences in US features between the pCR and non-pCR tumors at baseline.
| Features | pCR (n=20) | Non-pCR (n=54) | t/χ2 | P value |
|---|---|---|---|---|
| Size (mm) | ||||
| Maximum diameter | 34.16±17.50 | 30.06±12.86 | 1.100 | 0.275 |
| Anteroposterior diameter | 19.33±7.66 | 17.81±6.05 | 0.886 | 0.379 |
| Echogenicity | 1.747 | 0.334 | ||
| Hypoechoic | 17 [85] | 51 [94] | ||
| Non-hypoechoic | 3 [15] | 3 [6] | ||
| Shape | 0.761 | 1 | ||
| Regular | 0 | 2 [4] | ||
| Irregular | 20 [100] | 52 [96] | ||
| Orientation | 0.009 | 1 | ||
| Parallel | 19 [95] | 51 [94] | ||
| Non-parallel | 1 [5] | 3 [6] | ||
| Margin | 2.010 | 0.156 | ||
| Microlobulated or indistinct | 17 [85] | 37 [69] | ||
| Angular or spiculated | 3 [15] | 17 [31] | ||
| Posterior features | 4.580 | 0.032 | ||
| Attenuation or combined feature | 10 [50] | 41 [76] | ||
| No feature or enhancement | 10 [50] | 13 [24] | ||
| Microcalcification | 0.905 | 0.342 | ||
| Presence | 11 [55] | 23 [43] | ||
| Absence | 9 [45] | 31 [57] | ||
| Hyperechoic halo | 0.473 | 0.491 | ||
| Presence | 8 [40] | 17 [31] | ||
| Absence | 12 [60] | 37 [69] | ||
| CDFI | 0.234 | 0.628 | ||
| Adler 0–1 | 12 [60] | 29 [54] | ||
| Adler 2–3 | 8 [40] | 25 [46] |
Data are presented as mean ± standard deviation or number [%]. US, ultrasound; pCR, pathologic complete response; CDFI, color Doppler flow image.