Table 2 Clinicopathological features of eleven cases of carcinoma with pure squamous differentiation diagnosed on breast biopsies
| No. | Age | Side | Size (cm) | ER, PR, HER2 status | Final diagnosis | Second malignancy | DCIS | LN metastasis | Follow-up (months) | Recurrent status |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 59 | R | 5.5 | NA | PSCC | No | No | NA | NA | NA |
| 2 | 49 | R | 3.5 | TNBC | Metaplastic CA | No | No | 0/2 | 6 | Alive, no recurrence |
| 3 | 61 | L | 2.5 | TNBC | Metaplastic CA | R Breast IDC | Yes | 0/2 | 16 | Alive, no recurrence |
| 4 | 89 | L | 12.5 | TNBC | Metaplastic CA | No | Yes | 17/17 | 2 | Alive, no recurrence |
| 5 | 92 | L | 3.2 | TNBC | Metastatic SCC | Scalp SCC | NA | NA | NA | NA |
| 6 | 43 | L | 2.2 | NA | Metastatic SCC | Cervical SCC | NA | NA | NA | NA |
| 7 | 41 | R | 2.7 | TNBC | Metaplastic CA | No | Yes | NA | 22 | Pleural metastatic adenocarcinoma |
| 8 | 65 | L | 2.8 |
ER 22% (+) PR 2% (+) HER2 (−) | Metastatic SCC | Cervical SCC | NA | NA | NA | NA |
| 9 | 64 | L | 5 |
ER 50% (+) PR (−) HER2 (−) | Metaplastic CA | No | No | 1/7, with isolated cancer cells | 132 | Alive, no recurrence |
| 10 | 73 | R | 4.2 | TNBC | Metastatic SCC | Neck SCC | NA | 7/11 | 103 | Alive, no recurrence |
| 11 | 85 | L | 9.1 | TNBC | PSCC | R Breast ACC | No | NA | NA | NA |