| Week | Toxicity effects | ||
| Dysphagia | Dysphonia | Erythema | |
| I | 0 | 0 | 0 |
| II | 4 | 1 | 0 |
| III | 18 | 2 | 0 |
| IV | 1 | 1 | 0 |
| V | 2 | 4 | 6 |
| VI | 2 | 1 | 7 |
| VII | 0 | 2 | 2 |