Table I.
Tumor location of single primary SCC and multiple primary carcinomas.
| Tumor location | Single 1° SCC (n=961) | Multiple 1° SCC at FO (n=54) |
|---|---|---|
| Tongue | – | – |
| Lateral | 498 | 14 |
| Inferior surface | 5 | 7 |
| Dorsal surface | 3 | 0 |
| Tongue + buccal mucosa | 0 | 1 |
| Lower gingiva | ||
| Lateral | 124 | 16 |
| Mid gingiva | 7 | 2 |
| Lower gingiva + tongue | 0 | 2 |
| Lower gingiva + floor of mouth | 0 | 5 |
| Lower gingiva + buccal mucosa | 0 | 1 |
| Lower gingiva + buccal mucosa + upper gingiva | 0 | 1 |
| Buccal mucosa | – | – |
| Lateral | 74 | 6 |
| Lip mucosa | 3 | 0 |
| Buccal mucosa + lower lip | 0 | 1 |
| Upper gingiva | ||
| Unilateral | 116 | 7 |
| Bilateral | 0 | 1 |
| Upper gingiva + lower lip | 0 | 1 |
| Floor of mouth | 73 | 5 |
| Palate | 34 | 4 |
1°, primary; SSC, squamous cell carcinoma; FO, first occurrence.