Table 5.
Baseline characteristics in the cohort with occult lung cancer
| Variables | All patients (N = 2353) |
Percentage (%) |
|---|---|---|
| Sex | ||
| Male | 1235 | 52.5 |
| Female | 1118 | 47.5 |
| Tumor differentiation | ||
| Well | 186 | 7.9 |
| Moderate | 409 | 17.4 |
| Poor | 686 | 29.1 |
| Unknown | 1072 | 45.6 |
| Tumor location | ||
| Upper lobe | 1096 | 46.6 |
| Middle lobe | 105 | 4.5 |
| Lower lobe | 668 | 28.4 |
| Other location | 105 | 4.5 |
| Unknown | 379 | 16.0 |
| Age (year) | ||
| ≤ 72 | 1210 | 51.4 |
| > 72 | 1143 | 48.6 |
| Median (range) | 72 (19–99) | |
| Histological subtypes | ||
| Squamous cell carcinoma | 726 | 30.9 |
| Adenocarcinoma | 776 | 33.0 |
| Non-squamous and non-adenocarcinoma NSCLC | 165 | 7.0 |
| Small-cell carcinoma | 300 | 12.7 |
| Unknown non-sarcoma carcinoma | 55 | 2.3 |
| Unknown NSCLC | 331 | 14.1 |
| Chemotherapy | ||
| No | 1677 | 71.3 |
| Yes | 676 | 28.7 |
| Radiotherapy | ||
| No | 1703 | 72.4 |
| Yes | 623 | 26.5 |
| Unknown | 27 | 1.1 |
| Marital status | ||
| Married | 1092 | 46.4 |
| Non-married | 1116 | 47.4 |
| Unknown | 145 | 6.2 |
| Race/ ethnicity | ||
| Non-Hispanic whites | 1928 | 81.9 |
| Non-Hispanic other | 425 | 18.1 |
| Surgical treatment | ||
| None | 2077 | 88.3 |
| Limited resection | 77 | 3.3 |
| Lobectomy | 126 | 5.4 |
| Pneumonectomy | 7 | 0.3 |
| Unknown surgical approach | 4 | 0.2 |
| Unknown | 62 | 2.5 |
NSCLC non-small cell lung cancer