Table 1.
Characteristics | IHC = 0 | IHC = 1 | IHC = 2 | IHC = 3 | χ2 | P |
---|---|---|---|---|---|---|
Gender | 7.613 | 0.055 | ||||
Male | 30 | 38 | 43 | 4 | ||
Female | 11 | 35 | 40 | 7 | ||
Age | 3.869 | 0.276 | ||||
> 60 | 20 | 43 | 36 | 6 | ||
≤ 60 | 21 | 30 | 47 | 5 | ||
Differentiation | 22.416 | 0.033 | ||||
High | 6 | 10 | 9 | |||
High‐medium | 1 | 9 | 9 | 1 | ||
Medium | 9 | 29 | 35 | 2 | ||
Medium‐low | 10 | 14 | 18 | 5 | ||
Low | 15 | 10 | 12 | 3 | ||
Metastasis | 8.581 | 0.035 | ||||
N | 30 | 39 | 40 | 4 | ||
Y | 11 | 34 | 43 | 7 | ||
Stage | 11.644 | 0.234 | ||||
I | 14 | 34 | 33 | 4 | ||
II | 11 | 18 | 16 | 1 | ||
III | 13 | 11 | 22 | 6 | ||
IV | 3 | 1 | 2 | 0 | ||
Smoking status | 11.197 | 0.011 | ||||
Never | 16 | 48 | 59 | 7 | ||
Smoker | 26 | 27 | 28 | 4 | ||
EGFR mutation (n = 76) | 9.555 | 0.023 | ||||
Exon 21 | 1 | 11 | 11 | 3 | ||
Exon 19 | 0 | 4 | 6 | 1 | ||
No | 11 | 10 | 15 | 3 |
Bold values indicate: two‐sided t‐test: P < 0.05. Negative staining (immunohistochemical [IHC] = 0), weak positive staining (IHC = 1), positive staining (IHC = 2), strong positive staining (IHC = 3).