Table 2

Baseline characteristics of different second-line therapy subgroups

Clinicopathologic variablesTotalGem-based regimen for second-line treatment subgroupPTotal5-FU-based regimen for second-line treatment subgroupP
Combined regimen (%)Single Gem (%)Combined regimen (%)Single 5-FU (%)
n34428064453348105
Age (years)
 ≤ 63173 (50.3)147 (52.5)26 (40.6)0.115266 (58.7)199 (57.2)67 (63.8)0.273
 > 63171 (49.7)133 (47.5)38 (59.4)187 (41.3)149 (42.8)38 (36.2)
Gender
 Female148 (43.0)123 (43.9)25 (39.1)0.569208 (45.9)162 (46.6)46 (43.8)0.702
 Male196 (57.0)157 (56.1)39 (60.9)245 (54.1)186 (53.4)59 (56.2)
CA19-9 (U/mL)
 ≤ 200146 (42.4)115 (41.1)31 (48.4)0.350218 (48.1)171 (49.1)47 (44.8)0.500
 > 200198 (57.6)165 (58.9)33 (51.6)235 (51.9)177 (50.9)58 (55.2)
Primary tumor size (cm)
 ≤ 4182 (52.9)152 (54.3)30 (46.9)0.351239 (52.8)178 (51.1)61 (58.1)0.255
 > 4162 (47.1)128 (45.7)34 (53.1)214 (47.2)170 (48.9)44 (41.9)
Metastatic lesion size (cm)
 ≤ 4194 (56.4)157 (56.1)37 (57.8)0.909237 (52.3)184 (52.9)53 (50.5)0.749
 > 4150 (43.6)123 (43.9)27 (42.2)216 (47.7)164 (47.1)52 (49.5)
Metastatic lesion size [mean (SD), cm]
2.94 (1.34)2.93 (1.31)2.98 (1.46)0.7803.04 (1.25)3.04 (1.24)3.01 (1.27)0.806
Location
 Pancreas other than the pancreatic head116 (33.7)92 (32.9)24 (37.5)0.574159 (35.1)122 (35.1)37 (35.2)> 0.999
 Pancreatic head228 (66.3)188 (67.1)40 (62.5)294 (64.9)226 (64.9)68 (64.8)
Distant metastasis
 Absent38 (11.0)33 (11.8)5 (7.8)0.48849 (10.8)41 (11.8)8 (7.6)0.306
 Present306 (89.0)247 (88.2)59 (92.2)404 (89.2)307 (88.2)97 (92.4)
Liver metastasis
 Absent148 (43.0)123 (43.9)25 (39.1)0.569164 (36.2)126 (36.2)38 (36.2)> 0.999
 Present196 (57.0)157 (56.1)39 (60.9)289 (63.8)222 (63.8)67 (63.8)
Lung metastasis
 Absent240 (69.8)196 (70.0)44 (68.8)0.964338 (74.6)265 (76.1)73 (69.5)0.172
 Present104 (30.2)84 (30.0)20 (31.2)115 (25.4)83 (23.9)32 (30.5)
Bone metastasis
 Absent288 (83.7)242 (86.4)56 (87.5)0.133411 (90.7)312 (89.7)99 (94.3)0.214
 Present56 (16.3)38 (13.6)8 (12.5)42 (9.3)36 (10.3)6 (5.7)
Peritoneal metastasis
 Absent265 (77.0)221 (78.9)44 (68.8)0.114345 (76.2)263 (75.6)82 (78.1)0.689
 Present79 (23.0)59 (21.1)20 (31.2)108 (23.8)85 (24.4)23 (21.9)
Lymph node metastasis
 Absent215 (62.5)171 (61.1)44 (68.8)0.208268 (59.2)205 (58.9)63 (60.0)0.931
 Present129 (37.5)109 (38.9)20 (31.2)185 (40.8)143 (41.1)42 (40.0)