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Test of equality of survival distributions (DFS) for the different levels of Ki-67 in each molecular subtype
| Molecular subtype | Chi-square | df | Sig. |
| Luminal A | Estimation is limited | ||
| Luminal B | 1.114 | 1 | 0.299 |
| HER2 neu | 0.021 | 1 | 0.885 |
| Triple-negative | 1.942 | 1 | 0.163 |
