| LNM | Lymph node metastasis |
| ECS | Extra-capsular spread |
| OTC | Oral tongue cancer |
| HPV | Human papillomavirus |
| OPC | Oropharyngeal cancer |
| HPC | Hypopharyngeal cancer |
| DOI | Depth of invasion |
| WPOI | Worst pattern of invasion |
| PNI | Perineural invasion |
| LVI | Lymphovascular invasion |
| ROC | Receiver operating characteristics |
| AUC | Area under the curve |
| LOOCV | Leave-one-out cross-validation |
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