Table 1.
CD200 Expression in Neuroendocrine Neoplasms and Nonneuroendocrine Neoplasms
| Tumor Pype | No. Positive (%) | Total No. Cases |
|---|---|---|
| Neuroendocrine neoplasms | 338 (86) | 391 |
| Pulmonary small cell carcinoma | 60 (83) | 72 |
| Large cell neuroendocrine carcinoma | 4 (4) | 5 |
| Pulmonary carcinoid | 15 (65) | 23 |
| Merkel cell carcinoma | 125 (84) | 149 |
| Gastrointestinal luminal carcinoids | 78 (95) | 82 |
| Small bowel | 49 (89) | 55 |
| Appendix | 20 (95) | 21 |
| Large bowel | 4 (100) | 4 |
| Stomach | 2 (100) | 2 |
| Pancreatic neuroendocrine tumor | 56 (94) | 60 |
| Nonneuroendocrine neoplasms | 32 (20) | 157 |
| Colorectal carcinoma | 0 (0) | 12 |
| Prostatic carcinoma | 0 (0) | 8 |
| Breast carcinoma | 0 (0) | 15 |
| Pulmonary adenocarcinoma | 0 (0) | 52 |
| Pulmonary squamous cell carcinoma | 2 (10) | 20 |
| Pancreatic adenocarcinoma | 0 (0) | 5 |
| Renal cell carcinoma | 5 (72) | 7 |
| Papillary thyroid carcinoma | 10 (100) | 10 |
| Ovarian carcinoma | 6 (67) | 9 |
| Cutaneous squamous cell carcinoma | 0 (0) | 10 |
| Cutaneous basal cell carcinoma | 9 (100) | 9 |