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Summary of immunohistochemical stains with results on Case 1 and Case 2
| Immunohistochemical stain | Case 1 | Case 2 |
|---|---|---|
| ALK-1 | Negative | Negative |
| BCL-6 | Negative | Negative |
| CD3 | Negative | Negative |
| CD20 | Negative | Negative |
| CD30 | Negative | Positive |
| CD79a | Negative | Negative |
| CD138 | Positive | Positive |
| Cytokeratin | Negative | Negative |
| EBER-ISH | Positive | Positive |
| EBV-LMP | Negative | Negative |
| MUM-1 | Positive | Positive |
