Table 3. Cancer characteristics.
| Stage 1 | 4 | 27/1,374 | 1.97% |
| Stage 2 | 4 | 63/1,374 | 4.58% |
| Stage 3 | 6 | 347/1,795 | 19.33% |
| Stage 4 | 4 | 1121/1,374 | 81.50% |
| Stage 1A | 1 | 10/67 | 14.90% |
| Stage 1B | 1 | 4/67 | 5.97% |
| Stage 2A | 2 | 6/1,171 | 0.50% |
| Stage 2b | 2 | 29/1,171 | 2.47% |
| Stage 3A | 3 | 187/1,592 | 11.74% |
| Stage 3B | 3 | 109/1,592 | 6.85% |
| Stage 4A | 1 | 699/1,104 | 63% |
| Stage 4B | 1 | 300/1,104 | 27% |
| Histology | |||
| Nonsmall cell | 4 | 623/776 | 80.20% |
| Small cell | 0 | 0 | 0 |
| Squamous cell | 7 | 258/1,999 | 12.90% |
| Adenocarcinoma | 7 | 976/1,999 | 48.82% |
| Large cell carcinoma | 4 | 41/691 | 5.93% |
| Carcinoid | 2 | 10/204 | 4.90% |
| Undifferentiated | 2 | 14/283 | 4.94% |
| Others | 4 | 23/534 | 4.30% |
| Adenosis carcinoma | 1 | 1/67 | 1% |
| Neuroendocrine carcinoma | 1 | 65/1,104 | 5.88% |
| Adenosquamous cell carcinoma | 1 | 9/1,104 | 0.81% |
| Epidermoid carcinoma | 1 | 243/1,104 | 22.00% |