Table 2. Comparison of ultrasound imaging characteristics between HER-2 negative and positive groups.
| Image characteristics | HER-2 negative group (n=31) | HER-2 positive group (n=39) | χ2 score | P value |
|---|---|---|---|---|
| Size | 8.5 | 0.004* | ||
| <20 mm | 22 | 14 | ||
| ≥20 mm | 9 | 25 | ||
| Shape | 4.28 | 0.04* | ||
| Regular | 8 | 3 | ||
| Irregular | 23 | 36 | ||
| Edge | 7.56 | 0.006* | ||
| Clear | 18 | 10 | ||
| Spiculated | 13 | 29 | ||
| Aspect ratio | 0.154 | 0.69 | ||
| <1 | 26 | 34 | ||
| ≥1 | 5 | 5 | ||
| Stiff ring sign | 3.52 | 0.06 | ||
| Yes | 9 | 20 | ||
| No | 22 | 19 | ||
| Calcification sign | 10.88 | 0.001* | ||
| Yes | 10 | 28 | ||
| No | 21 | 11 |
Data are expressed as number. *, statistically significant. HER-2, human epidermal growth factor receptor-2.