Table 2.
Demographic, tumor and treatment characteristics
| Demographics | All patients (n = 8082) | Low-grade tumora (n = 4491) | High-grade tumora (n = 2595) | P value |
|---|---|---|---|---|
| Sex (%) | .009 | |||
| Male | 50.4 | 49.0 | 52.3 | |
| Age (y) | NS | |||
| Mean ± SD | 65.2 ± 11.0 | 65.2 ± 10.8 | 65.3 ± 10.9 | |
| Median | 66.0 | 66.3 | 66.5 | |
| Race (%) | NS | |||
| White | 83.1 | 82.9 | 84.2 | |
| Black | 9.9 | 9.9 | 9.2 | |
| Other | 6.8 | 7.3 | 6.6 | |
| Tumor location (%) | NS | |||
| Head | 85.6 | 85.7 | 85.4 | |
| Body | 5.1 | 5.2 | 4.9 | |
| Tail | 9.4 | 9.1 | 9.7 | |
| Type of surgery (%) | NS | |||
| Whipple procedure | 82.4 | 82.2 | 82.7 | |
| Distal pancreatectomy | 9.3 | 9.4 | 9.2 | |
| Total pancreatectomy | 8.3 | 8.4 | 8.0 | |
| Tumor size (cm) | <.001 | |||
| Mean ± SD | 3.5 ± 1.9 | 3.4 ± 1.8 | 3.7 ± 2.1 | |
| Median | 3.1 | 3.0 | 3.4 | |
| Lymph node status (%) | <.001 | |||
| Positive | 60.3 | 57.9 | 64.6 | |
| AJCC state (%) | <.001 | |||
| IA | 4.3 | 5.2 | 2.7 | |
| IB | 8.1 | 8.7 | 7 | |
| IIA | 24.6 | 25.7 | 22.7 | |
| IIB | 49.5 | 48.6 | 51 | |
| III | 6.8 | 6.5 | 7.4 | |
| IV | 6.7 | 5.2 | 9.1 | |
| Number of nodes examined | NS | |||
| Mean ± SD | 9.8 ± 8.0 | 9.8 ± 8.0 | 9.8 ± 8.0 | |
| Median | 8.0 | 8.0 | 8.0 | |
| Number of positive nodes | .006 | |||
| Mean ± SD | 2.9 ± 2.6 | 2.9 ± 2.5 | 3.1 ± 2.7 | |
| Median | 2.1 | 2.0 | 2.6 | |
| Radiation (%) | .001 | |||
| Yes | 42.7 | 44.2 | 40.2 |
Percentages may not add up to 100 due to rounding
AJCC American Joint Committee on Cancer
aLow grade included grades 1 and 2; high grade included grades 3 and 4. Excluded from these 2 columns were 996 patients for whom data were unavailable