Table 1 Characteristics of spontaneous mammary tumors in BALB/c-Trp53+/- mice
| Reproductive history | Histopathology | Number | Frequency | ERα-positive |
|---|---|---|---|---|
| Nulliparous | Mammary intra-epithelial neoplasia | 1 | 3.4% | 1 |
| Adenocarcinoma | 25 | 86.2% | 3 | |
| Carcinosarcoma | 1 | 3.4% | 0 | |
| Adenosquamous | 2 | 6.8% | 0 | |
| Parous | Mammary intra-epithelial neoplasia | 2 | 8.3% | 0 |
| Adenocarcinoma | 21 | 87.5% | 7 | |
| Carcinosarcoma | 0 | 0 | 0 | |
| Adenosquamous | 1 | 4.2% | 0 |