Table 1 Demographical and clinicopathological characteristics of patients over 40 years old with surgically resected PC
Variable | Variable level | N | Training Set (n = 4242) n(%) | Validation Set (n = 2099) n (%) | p-value |
|---|---|---|---|---|---|
Age (years) | < 60 | 1849 | 1231 (29.0) | 618 (29.4) | 0.727 |
≥60 | 4492 | 3011 (71.0) | 1481 (70.6) | ||
Gender | Male | 3260 | 2196 (51.8) | 1064 (50.7) | 0.419 |
Female | 3081 | 2046 (48.2) | 1035 (49.3) | ||
Tumor Location in pancreas | Head | 4750 | 3174 (74.8) | 1576 (75.1) | 0.778 |
Body | 605 | 400 (9.4) | 205 (9.8) | ||
Tail | 986 | 668 (15.8) | 318 (15.1) | ||
Grade | Well differentiated | 1350 | 928 (21.9) | 422 (20.1) | 0.433 |
Moderately differentiated | 2866 | 1898 (44.7) | 968 (46.1) | ||
Poorly differentiated | 2028 | 1352 (31.9) | 676 (32.2) | ||
Undifferentiated | 97 | 64 (1.5) | 33 (1.6) | ||
AJCC TNM stage | I | 1073 | 713 (16.8) | 360 (17.2) | 0.732 |
II | 5268 | 3529 (83.2) | 1739 (82.8) | ||
Regional lymph nodes surgery | None | 42 | 31 (0.7) | 11 (0.5) | 0.332 |
1~3 | 374 | 240 (5.7) | 134 (6.4) | ||
≥4 | 5925 | 3971 (93.6) | 1954 (93.1) | ||
Tumor size (cm) | ≤2 | 1232 | 854 (20.1) | 378 (18.0) | 0.128 |
(2~4) | 3195 | 2123 (50.0) | 1072 (51.1) | ||
≥4 | 1914 | 1265 (29.9) | 649 (30.9) | ||
LNR | ≤0.1732 | 4348 | 2926 (69.0) | 1422 (67.7) | 0.321 |
> 0.1732 | 1993 | 1316 (31.0) | 677 (32.3) |