Table 1 Clinical and demographic characteristics of study participants
| Â | N | Percent (%) |
|---|---|---|
Number of patients | 527 | Â |
Gender | ||
 Male | 298 | 56.5 |
 Female | 229 | 43.5 |
Age | ||
 Median (range) | 62.5 (27.0–93.9) | |
Primary tumor location | ||
 Head | 195 | 37.0 |
 Uncinate | 16 | 3.0 |
 Body | 108 | 20.5 |
 Tail | 94 | 17.8 |
 Overlapping area | 114 | 21.6 |
Clinical stage | ||
 I | 48 | 9.1 |
 II | 111 | 21.1 |
 III | 120 | 22.8 |
 IV | 248 | 47.1 |
Family cancer history | ||
 Yes | 286 | 54.3 |
 No | 236 | 44.8 |
 Unknown | 5 | 0.9 |