Table 1 Relationship of miRNA let-7i expression level and clinicopathological features

Age (years)

≤59

43

0.33 ± 0.14

0.388

#62;59

43

0.26 ± 0.19

Sex

Male

57

0.38 ± 0.35

0.215

Female

29

0.24 ± 0.16

Local invasion

T₂

19

0.87 ± 0.71

<0.001 ^a

T₃

35

0.40 ± 0.25

0.002 ^b

T₄

32

0.13 ± 0.11

Lymphatic metastasis

N₁

33

0.49 ± 0.44

0.003

N₂

53

0.18 ± 0.15

Tumor site

Upper

22

0.35 ± 0.30

0.262

Middle

30

0.25 ± 0.23

Lower

34

0.30 ± 0.22

Cell grade

Poor

60

0.27 ± 0.18

0.476

Moderate

26

0.32 ± 0.28

Pathologic tumor response

Responder

55

0.59 ± 0.46

<0.001

Non-responder

31

0.16 ± 0.10