Table 1.
Clinical Characteristics of patients by their nodal involvement
| Clinicopathological features | Pathologic LN negative (n = 153) | Pathologic LN positive (n = 34) | P‐value |
|---|---|---|---|
| Gender | |||
| Male | 66 (43.1%) | 11 (32.4%) | 0.34 |
| Female | 87 (56.9%) | 23 (67.6%) | |
| Age | |||
| Median (range) | 59 (37‐80) | 60.5 (30‐76) | 0.36 |
| Smoking history | |||
| Smokers | 63 (41.2%) | 14 (41.2%) | 1 |
| Non‐smokers | 90 (58.8%) | 20 (58.8%) | |
| Histological subtypea | |||
| Lepidic predominant adenocarcinomas | 47 (30.7%) | 6 (17.6%) | 0.15 |
| Others | 106 (69.3%) | 28 (82.4%) | |
| Pathological stage | |||
| Early stage (I or II) | 150 (98%) | 9 (26.5%) | <0.0001 |
| Advanced stage (III or IV) | 3 (2%) | 25 (73.5%) | |
a
Histologic subtype was categorized as lepidic predominant adenocarcinomas (adenocarcinoma in situ, minimally invasive adenocarcinoma, and lepidic predominant invasive adenocarcinoma) and other subtypes of dominant histologic findings (acinar, papillary, micropapillary, and solid predominant as well as variants of invasive adenocarcinoma).