Characteristic | All patients | STAS (+) | STAS (-) | t/χ2 value | p-value |
---|---|---|---|---|---|
Pathological overall size | 2.2 ± 1.0 | 2.5 ± 1.0 | 1.8 ± 0.8 | 3.869 |  < 0.001 |
Histological subtype |  |  |  | 26.803a |  < 0.001 |
 MIA | 16 | 0 | 16 |  |  |
 Lepidic predominant | 13 | 8 | 5 |  |  |
 Acinar predominant | 65 | 41 | 24 |  |  |
 Papillary predominant | 6 | 4 | 2 |  |  |
 Micropapillary predominant | 2 | 1 | 1 |  |  |
 Solid predominant | 6 | 6 | 0 |  |  |
T stage | Â | Â | Â | 13.365a | 0.008 |
 T1a | 10 | 1 | 9 |  |  |
 T1b | 41 | 22 | 19 |  |  |
 T1c | 37 | 21 | 16 |  |  |
 T2a | 14 | 11 | 3 |  |  |
 T2b | 6 | 5 | 1 |  |  |
N stage | Â | Â | Â | 10.800a | 0.005 |
 N0 | 88 | 44 | 44 |  |  |
 N1 | 12 | 12 | 0 |  |  |
 N2 | 8 | 4 | 4 |  |  |
VPI | Â | Â | Â | 8.727 | 0.003 |
 Present | 91 | 45 | 46 |  |  |
 Absent | 17 | 15 | 2 |  |  |
LVI | Â | Â | Â | 9.060 | 0.003 |
 Present | 29 | 23 | 6 |  |  |
 Absent | 79 | 37 | 42 |  |  |
Perineural invasion | Â | Â | Â | 0.042a | 0.838 |
 Present | 6 | 3 | 3 |  |  |
 Absent | 102 | 57 | 45 |  |  |