Table 1 Association between clinicopathological parameters and PD-L1 expression in 373 PDAC patients

total

373

27

346

12

361

Age (years)

373

0.924

0.550

 Mean ± SD

60.12 ± 9.96

59.93 ± 9.39

58.42 ± 8.38

60.16 ± 9.96

Gender

0.561

0.067

 male

215

17

198

10

205

 female

158

10

148

2

156

Smoking

0.568

0.772

 yes

132

11

121

4

128

 no

238

16

222

6

232

Drinking

0.236

0.139

 yes

65

7

58

0

65

 no

305

20

285

10

295

History of pancreatitis

0.001

0.868

 yes

1

1

0

0

1

 no

370

26

344

10

360

Family history

0.528

0.371

 yes

5

0

5

0

5

 no

366

27

339

10

356

WBC (×10⁹)

0.891

0.750

 >10

30

2

28

1

29

 4–10

245

21

224

6

239

 <4

19

2

17

1

18

Tumor differentiation

0.150

0.820

 moderate /poor

307

20

287

10

297

 well

59

7

52

1

58

pT

0.494

0.586

 1

2

0

2

0

2

 2

18

0

18

1

17

 3

340

26

314

10

330

 4

8

1

7

0

8

Clinical staging

1.000

1.000

 1

10

0

10

0

10

 2

329

25

304

11

318

 3

13

1

12

0

13

 4

15

1

14

0

15

Lymph node metastasis

0.759

0.058

 yes

192

13

179

8

184

 no

90

7

83

0

90

Lymphovascular invasion

1.000

1.000

 yes

28

2

26

0

28

 no

135

11

124

4

131