Table 1.
Summary of immunohistochemical staining for GRM1.
| Tumor type | Total cases | GRM1 positive (%)a | GRM1 negative (%) |
|---|---|---|---|
| Chondromyxoid fibroma | 30 | 29 (97) | 1 (3) |
| Primary aneurysmal bone cyst | 35 | 0 (0) | 35 (100) |
| Giant cell tumor of bone | 27 | 0 (0) | 27 (100) |
| Chondroblastoma | 24 | 0 (0) | 24 (100) |
| Conventional chondrosarcoma | 20 | 0 (0) | 20 (100) |
| Chondroblastic osteosarcoma | 15 | 0 (0) | 15 (100) |
| Fibrous dysplasia | 15 | 0 (0) | 15 (100) |
| Extraskeletal myxoid chondrosarcoma | 15 | 0 (0) | 15 (100) |
| Myoepithelial tumor | 13 | 0 (0) | 13 (100) |
| Chordoma | 10 | 0 (0) | 10 (100) |
| Enchondroma | 10 | 0 (0) | 10 (100) |
| Clear cell chondrosarcoma | 5 | 0 (0) | 5 (100) |
| Phosphaturic mesenchymal tumor | 5 | 0 (0) | 5 (100) |
| Brown tumor | 4 | 0 (0) | 4 (100) |
| Chondromyxoid fibroma-like osteosarcoma | 2 | 0 (0) | 2 (100) |
a
Positivity was defined as presence of cytoplasmic staining in greater than 5% of cells.