Table 2. Association of the difference in estrogen receptor staining between the core biopsy and resection specimens with cold ischemia time using a difference of 25% (resection-biopsy) as the cutoff or with a change in estrogen receptor staining category.
| Group | Cold ischemia time (min) | P-value (Kruskal-Wallis test) | ||
|---|---|---|---|---|
| Median | Minimum | Maximum | ||
| No change (n = 78) | 108 | 64 | 357 | 0.32 |
| Change (n = 19) | 115 | 71 | 196 | |
| No change (n = 78, 82%) | 108 | 64 | 357 | 0.10 |
| Increase (n = 10,10%) | 107 | 71 | 184 | |
| Decrease (n = 9, 9%) | 144 | 73 | 196 | |