| COX-2 | Cyclooxygenase-2 |
| PGE2 | Prostaglandin E2 |
| PTC | Papillary thyroid carcinoma |
| DFS | Disease-free survival |
| FFPE | Formalin-fixed and paraffin-embedded |
| PCR | Polymerase chain reaction |
| TMA | Tissue microarray |
| IHC | Immunohistochemistry |
| SD | Standard deviation |
| HR | Hazard ratio |
| CI | Confidence interval |
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