Table 2. Reslts of immunostaining of the neoplastic epithelial cells and stromal cellsa).
| Cell type | AE1/AE3 | KL1 | CAM5.2 | CK14 | CK18 | E-cadherin | Vimentin | SMA | p63 | Adipophilin | MelanA | S-100a | Nestin | Ki67b) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Neoplasticepithelial cells | ||||||||||||||
| Present case | + | + (>5%)c) | – | + | – | + | – | – | + | – | – | – | – | 6.4% |
| Common type trichoblastoma (n=5) | + | – | – | + | – | + | – | – | + | – | – | – | – | 6.2 ± 4.7%d) |
| Stromal cells | ||||||||||||||
| Present case | – | – | – | – | – | – | + | – | – | – | – | – | + (>10%) | 9.4% |
| Common type trichoblastoma (n=5) | – | – | – | – | – | – | + | – | – | – | – | – | –/±e) | 1.0 ± 0.6%d) |
a) –=negative; +=positive, b) positive rate for Ki67, c) Only central part of epithelial cells resembling outer root sheath cells is positive for KL-1, d) mean ± SD, e) A few number of mesenchymal cells are positive for nestin (2 of 5).