Table 3. Association of the difference in estrogen receptor staining between the core biopsy and resection specimens with cold ischemia time using 2 h as the cutoff for cold ischemia time.
| Groups | Cold ischemia time | P-value (Fisher's exact test) | |
|---|---|---|---|
| Less than 2 h (n=58) | Greater than 2 h (n=39) | ||
| No change | 48 | 30 | 0.60 |
| Change | 10 | 9 | |
| No change | 48 | 30 | 0.03a |
| Increase | 8 | 2 | |
| Decrease | 2 | 7 | |
a
In pair-wise comparison of the three groups, a P value between 0.016 and 0.05 was considered a trend.