Table 3. Relationship between the expression of miR-891b and clinicopathologic characteristics in patients with pancreatic ductal adenocarcinoma patients treated by surgical resection.

Characteristics	miR-891b high expression (n,%)	miR-891b low expression (n,%)	P value
Age (years)          < 60	27(48.2)	28(48.3)	0.995
≥ 60	29(51.8)	30(51.7)
Gender            Male	37(66.1)	31(53.4)	0.170
Female	19(33.9)	27(46.6)
Location of tumor      Head	46(82.1)	42(72.4)	0.216
Body or tail	10(17.9)	16(27.6)
Type of operation   Pancreaticoduodenectomy	47(83.9)	41(70.7)	0.189
Distal pancreatectomy	9(16.1)	16(27.6)
Total pancreatectomy	0(0)	1(1.7)
Maximum tumor diameter (cm) (mean ± SD)	3.83 ± 1.50	4.58 ± 2.00	0.027
Differenciation        Well	19(33.9)	21(36.2)	0.373
Moderately	31(55.4)	26(44.8)
Poor	6(10.7)	11(19.0)
Surgical margins       Negative	53(94.6)	58(100)	0.115
Positive	3(5.4)	0(0)
pT category          pT1+ pT2	34(60.7)	24(41.4)	0.039
pT3+pT4	22(39.3)	34(58.6)
pN category          pN0	51(91.1)	33(56.9)	0.000
pN1	5(8.9)	25(43.1)
Vessel invasion        No	34(60.7)	27(46.6)	0.130
Yes	22(39.3)	31(53.4)
Vascular tumor thrombus   No	56(100.0)	55(94.8)	0.244
Yes	0(0.0)	3(5.2)
Adjacent organs invasion  No	44(78.6)	42(72.4)	0.445
Yes	12(21.4)	16(27.6)
pTNM category        I	33(58.9)	20(34.5)	0.015
II	10(17.9)	23(39.7)
III	13(23.2)	15(25.9)
CA19-9 (U/mL)        < 37.0	7(14.9)	8(15.1)	0.978
≥ 37.0	40(85.1)	45(84.9)

Abbreviations: pT: pathologic T; pN: pathologic N; pTNM: pathologic TNM.