Table 3 The immunohistochemical characteristics of primary SCC/ASC and metastatic SCC/ASC
| Â | Primary SCC | Primary ASC | Metastatic SCC | Metastatic ASC |
|---|---|---|---|---|
Patients | 3 | 6 | 16 | 10 |
CK 18 | Â | Â | Â | Â |
 Negative | 1(33.3%) | 1(16.7%) | 8(57.1%) | 2(25%) |
 Positive | 2(66.7%) | 5(83.3%) | 6(42.9%) | 6(75%) |
CK 19 | Â | Â | Â | Â |
 Negative | 0 | 0 | 3(20%) | 2(20%) |
 Positive | 3(100%) | 6(100%) | 12(80%) | 8(80%) |
CEA | Â | Â | Â | Â |
 Negative | 2(100%) | 0 | 4(36.4%) | 0 |
 Positive | 0 | 5(100%) | 7(63.6%) | 10(100%) |