Table 1. Medline and Embase search strategy.
| 1. | SEARCH: | P53.TI,AB. |
| 2. | SEARCH: | PROTEIN-P53.DE. OR TUMOUR-SUPPRESSOR PROTEIN-P53.DE |
| 3. | SEARCH: | LARYNX-CANCER.DE. OR LARYNX-CARCINOMA.DE. |
| 4. | SEARCH: | LARYNX ADJ CANCER.TI,AB. |
| 5. | SEARCH: | LARYNX NEAR CANCER.TI,AB. |
| 6. | SEARCH: | LARYNX NEAR NEOPLASM.TI,AB. |
| 7. | SEARCH: | OROPHARYNX-CANCER.DE. OR OROPHARYNX-CARCINOMA.DE. |
| 8. | SEARCH: | OROPHARYNX NEAR CANCER.TI,AB. |
| 9. | SEARCH: | OROPHARYNX NEAR NEOPLASM.TI,AB. |
| 10. | SEARCH: | HYPOPHARYNX ADJ CANCER.TI,AB. |
| 11. | SEARCH: | HYPOPHARYNX-CANCER.DE. OR HYPOPHARYNX-CARCINOMA.DE. |
| 12. | SEARCH: | HYPOPHARYNX NEAR CANCER.TI,AB. |
| 13. | SEARCH: | HYPOPHARYNX NEAR NEOPLASM.TI,AB. |
| 14. | SEARCH: | ORAL ADJ CAVITY ADJ CANCER.TI,AB. |
| 15. | SEARCH: | ORAL ADJ CAVITY NEAR CANCER.TI,AB. |
| 16. | SEARCH: | ORAL ADJ CAVITY NEAR NEOPLASM.TI,AB. |
| 17. | SEARCH: | ORAL ADJ CAVITY-CANCER.DE. OR ORAL ADJ CAVITY-CARCINOMA.DE. |
| 18. | SEARCH: | MOUTH-CANCER.DE. OR MOUTH-CARCINOMA.DE |
| 19. | SEARCH: | MOUTH ADJ CANCER.TI,AB. |
| 20. | SEARCH: | MOUTH NEAR CANCER.TI,AB. |
| 21. | SEARCH: | MOUTH NEAR NEOPLASM.TI,AB. |
| 22. | SEARCH: | TONGUE ADJ CANCER.TI,AB. |
| 23. | SEARCH: | TONGUE-CANCER.DE. OR TONGUE-CARCINOMA.DE. |
| 24. | SEARCH: | TONGUE NEAR CANCER.TI,AB. |
| 25. | SEARCH: | TONGUE NEAR NEOPLASM.TI,AB. |
| 26. | SEARCH: | TONSIL ADJ CANCER.TI,AB. |
| 27. | SEARCH: | TONSIL-CANCER.DE. OR TONSIL-CARCINOMA.DE. |
| 28. | SEARCH: | TONSIL NEAR CANCER.TI,AB. |
| 29. | SEARCH: | TONSIL NEAR NEOPLASM.TI,AB. |
| 30. | SEARCH: | NECK ADJ CANCER.TI,AB. |
| 31. | SEARCH: | NECK-CANCER.DE. |
| 32. | SEARCH: | NECK NEAR CANCER.TI,AB. |
| 33. | SEARCH: | NECK NEAR NEOPLASM.TI,AB. |
| 34. | SEARCH: | HEAD-AND-NECK-SQUAMOUS-CELL-CARCINOMA.DE. |
| 35. | SEARCH: | NECK-METASTASIS.DE. |
| 36. | SEARCH: | 1 OR 2 |
| 37. | SEARCH: | 3 OR 4 OR 5 OR 6 OR 7 OR 8 OR 9 OR 10 OR 11 OR 12 OR 13 OR 14 OR 15 OR 16 |
| 38. | SEARCH: | 17 OR 18 OR 19 OR 20 OR 21 OR 22 OR 23 OR 24 OR 25 OR 26 OR 27 OR 28 OR 29 OR 30 OR 31 OR 32 OR 33 OR 34 |
| 39. | SEARCH: | 37 OR 38 |
| 40. | SEARCH: | 36 AND 39 |