Table 2. Differences in pathological characteristics between the STAS-positive and STAS-negative groups.
| Pathological characteristics | STAS-positive group (N=121) | STAS-negative group (N=121) | Stat† | P value |
|---|---|---|---|---|
| Type of pathology | 2.107 | <0.001a | ||
| Adenocarcinoma | 106 (87.60) | 108 (89.26) | ||
| Squamous cell cancer | 10 (8.26) | 10 (8.26) | ||
| Neuroendocrine cancer | 4 (3.31) | 1(0.83) | ||
| Other | 1 (0.83) | 2 (1.65) | ||
| Degree of pathological differentiation | 110.366 | <0.001 | ||
| Low differentiation | 84 (69.42) | 10 (8.26) | ||
| Middle-low differentiation | 6 (4.96) | 17 (14.05) | ||
| Middle differentiation | 29 (23.97) | 45 (37.20) | ||
| High-middle-differentiation | 2 (1.65) | 39 (32.23) | ||
| High differentiation | 0 (0.00) | 10 (8.26) | ||
| TNM staging | 33.442 | <0.001 | ||
| IA | 69 (57.02) | 105 (86.78) | ||
| IB | 9 (7.44) | 8 (6.60) | ||
| IIA | 4 (3.31) | 1 (0.83) | ||
| IIB | 9 (7.44) | 3 (2.48) | ||
| IIIA | 25 (20.66) | 3 (2.48) | ||
| IIIB | 5 (4.13) | 1 (0.83) | ||
| T | 5.084 | 0.11a | ||
| T1 | 97 (80.17) | 106 (87.60) | ||
| T2 | 21 (17.36) | 11 (9.09) | ||
| T3 | 2 (1.65) | 4 (3.31) | ||
| T4 | 1 (0.82) | 0 (0.00) | ||
| N | 32.979 | <0.001 | ||
| N0 | 78 (64.46) | 114 (94.21) | ||
| N1 | 12 (9.91) | 3 (2.48) | ||
| N2 | 31 (25.63) | 4 (3.31) | ||
| N3 | 0 (0.00) | 0 (0.00) | ||
| Vascular invasion | 132.071 | <0.001 | ||
| No | 87 (71.90) | 120 (99.17) | ||
| Yes | 34 (28.10) | 1 (0.83) | ||
| Pleural invasion | 12.956 | <0.001 | ||
| No | 63 (52.07) | 90 (74.38) | ||
| Yes | 58 (47.93) | 31 (25.62) |
Data are presented as n (%). †, In an independent samples t-test, the term “stat” refers to the t value. In a Mann-Whitney U test, “stat” refers to the Z value. For a chi-square test, “stat” refers to the Pearson value. a, Fisher test. STAS, spread through air spaces; TNM, tumor, node, metastasis.