Table 1.

Clinicopathological characteristics of the patients.

Patient characteristics (n=1431)	Median (range or %)
Age, years	60.3 (25-82)
Gender
Male	607 (42.4%)
Female	824 (57.6%)
Family history
Yes	63 (4.4%)
No	1368 (95.6%)
Smoking history
Yes	259 (18.1%)
No	1172 (81.9%)
Location
Right	901 (63.0%)
Left	530 (37.0%)
Lung lobe
Upper lobe	810 (56.6%)
Middle lobe	123 (8.6%)
Lower lobe	498 (34.8%)
T stage
T1	1061 (74.1%)
T2a	370 (25.9%)
Histological classification
Acinar predominant	584 (40.8%)
Papillary predominant	487 (34.0%)
Solid predominant	76 (5.3%)
Lepidic predominant	207 (14.5%)
Micropapillary predominant	13 (0.9%)
others	64 (4.5%)
Histological pattern
SMPP	89 (6.2%)
SMPM	374 (26.1%)
SMPN	968 (67.6%)
Lymphovascular invasion
Yes	22 (1.5%)
No	1409 (98.5%)
Radiologic features
Solid	854 (59.7%)
Subsolid	577 (40.3%)

SMPP, solid/micropapillary-predominant; SMPM, solid/micropapillary-minor; SMPN, solid/micropapillary-negative.