Table 2

Clinicopathological characteristics of patients with SMPC

all

%

SMPC

P value

(-)

%

(+)

%

No.

559

540

97

19

3

Age

Median

67

67

67

0.219*

Range

23-87

23-87

40-76

Gender

Female

288

52

282

52

6

32

0.077**

Male

271

48

258

48

13

68

Smoking status

Nonsmoker

284

51

276

51

8

42

0.596**

Smoker

275

49

264

49

11

58

BI Average

369

364

502

Tumor size

Average(mm)

25

25

35

Range(mm)

5-140

5-140

15-75

< 30 mm

396

71

388

72

9

47

< 0.001*

≥ 30 mm

163

29

152

28

10

53

Pathological stage

IA

363

65

360

67

4

21

< 0.001**

IB

95

17

88

16

6

32

IIA

36

6

31

6

5

26

IIB

13

2

13

2

0

0

IIIA

42

8

39

7

3

16

≥ IIIB

10

2

9

2

1

5

Lymph node metastasis

NX

69

12

68

13

1

5

N0

420

75

409

75

11

58

0.002**

≥ N1

70

13

63

12

7

21

Pleural invasion

Negative

452

80

446

83

6

32

< 0.001**

Positive

107

20

94

17

13

68

Lymphatic invasion

Negative

466

83

461

85

5

26

< 0.001**

Positive

93

17

79

15

14

74

Vascular invasion

Negative

427

76

422

78

5

26

< 0.001**

Positive

132

24

118

22

14

74

* Mann-Whitney's U test

** Chi-square for independence test

No., number of patients; BI, Brinkman index = (number of cigarettes per day) × (duration of years); SMPC, stromal micropapillary component; AMPC, aerogeneous micropapillary component

Ohe et al. Diagnostic Pathology 2012 7:3   doi:10.1186/1746-1596-7-3