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 |