Table 1. Patient, Tumor, and Treatment Characteristics in the Invasive IPMN Patients: Surveillance, Epidemiology, and End Results, 1992 to 2011.
| Variable | Patients No. | Percentage |
| Age, y | ||
| <65 | 454 | 42.0 |
| ≥65 | 626 | 58.0 |
| Sex | ||
| Women | 494 | 45.7 |
| Men | 586 | 54.3 |
| Race | ||
| White | 907 | 84.0 |
| Black | 78 | 7.2 |
| Other (American Indian/AK Native, Asian/Pacific Islander) | 91 | 8.4 |
| Unknown | 4 | 0.4 |
| Marital status | ||
| Married | 723 | 66.9 |
| Other | 357 | 33.1 |
| Diagnosis years intervals | ||
| 1992–1996 | 109 | 10.1 |
| 1997–2001 | 209 | 19.4 |
| 2002–2006 | 356 | 33.0 |
| 2007–2011 | 406 | 37.6 |
| Tumor location | ||
| Pancreatic Head | 711 | 65.8 |
| Other | 369 | 34.2 |
| T stage | ||
| T1 | 129 | 11.9 |
| T2 | 232 | 21.5 |
| T3 | 609 | 56.4 |
| T4 | 40 | 3.7 |
| Unknown | 70 | 6.5 |
| N stage | ||
| N0 | 588 | 54.4 |
| N1 | 483 | 44.7 |
| Unknown | 9 | 0.8 |
| M stage | 0.0 | |
| M0 | 1005 | 93.1 |
| M1 | 67 | 6.2 |
| Unknown | 8 | 0.7 |
| AJCC stage | ||
| I | 274 | 25.4 |
| II | 660 | 61.1 |
| III | 28 | 2.6 |
| IV | 75 | 6.9 |
| Unknown | 43 | 4.0 |
| Histological Grade | ||
| Well differentiated; Grade I | 213 | 19.7 |
| Moderately differentiated; Grade II | 421 | 39.0 |
| Poorly differentiated; Grade III | 196 | 18.1 |
| Undifferentiated; Grade IV | 11 | 1.0 |
| Unknown | 239 | 22.1 |
| Surgery Type | ||
| Pancreatoduodenectomy | 734 | 68.0 |
| Total pancreatectomy | 137 | 12.7 |
| Partial or Local pancreatectomy | 180 | 16.7 |
| Other | 29 | 2.7 |
| Radiation therapy | ||
| Received | 343 | 31.8 |
| Not Received | 718 | 66.5 |
| Unknown | 19 | 1.8 |
| Cause of death | ||
| Alive | 372 | 34.4 |
| Death | 708 | 65.6 |
| Pancreas | 582 | 53.9 |
| Other cause of death | 126 | 11.7 |
| Lymph Nodes Examined | ||
| 1∼5 | 280 | 25.9 |
| 6∼10 | 282 | 26.1 |
| 11∼16 | 257 | 23.8 |
| >16 | 261 | 24.2 |