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CTC detection rates according to various characteristics of the study cohort
| Characteristic | CTC‐positive number | |
|---|---|---|
| Number | % | |
| Pathologic type | ||
| Squamous cell carcinoma (n = 30) | 24 | 80.0 |
| Adenocarcinoma (n = 167) | 125 | 74.9 |
| Small cell carcinoma (n = 38) | 29 | 76.3 |
| Other (n = 5) | 5 | 100 |
| P | 0.738 | |
| Disease stage | ||
| I–III (n = 84) | 67 | 79.8 |
| IV (n = 156) | 116 | 74.4 |
| P | 0.427 | |
| Smoking | ||
| No (n = 127) | 95 | 74.8 |
| < 400/year (n = 22) | 18 | 81.8 |
| ≥ 400/year (n = 91) | 70 | 76.9 |
| P | 0.761 | |
CTC, circulating tumor cells.
