Review Article
Ancillary Testing in Lung Cancer Diagnosis
Table 2
Immunohistochemical profile of neuroendocrine tumors.
| IHC | Typical carcinoid | Atypical carcinoid | Primary lung small cell ca. | Metastatic small cell ca. |
| CD56 | + | + | + | + | Synaptophysin | + | + | +/− | +/− | Chromogranin | + | + | −/+ | −/+ | TTF-1 | −/+ | −/+ | Usually + | Usually − | Ki-67 | 0–5% | 5–15% | >20% (typically >60%) | >20% (typically >60%) |
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