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| Median survival (months) | P | |
|---|---|---|
| PS | ||
| 0 or 1 | 12 | NS |
| ⩾2 | 5 | |
| Stage | ||
| I and II | 10 | NS |
| IIIA and IIIB | 12 | |
| IV | 7 | |
| TTF1 staining | ||
| Positive | 14 | <0.00001 |
| Negative | 5 | |
| Differentiation | ||
| Poorly | 5 | 0.004 |
| Moderately | 13 | |
| Well | 12 | |
PS=performance status (ECOG); TTF1=thyroid transcription factor 1; NS=nonsignificant.
