Table 2. Univariate and multivariate analysis for overall survival.
| Variable | Median OS (mo) | UV | MV | |||
|---|---|---|---|---|---|---|
| HR (95% CI) | P value | HR (95% CI) | P value | |||
| Age (years) | 0.26 | 0.72 | ||||
| <70 | 21.6 | ref. | ref. | |||
| ≥70 | 15.6 | 1.56 (0.72, 3.37) | 0.81 (0.25, 2.63) | |||
| Sex | 0.93 | 0.22 | ||||
| Male | 17.7 | ref. | ref. | |||
| Female | 15.6 | 1.04 (0.46, 2.32) | 0.54 (0.20,1.44) | |||
| Pathologic AJCC tumor stage | 0.64 | 0.13 | ||||
| T1/2 | 20.5 | ref. | ref. | |||
| T3/4 | 15.6 | 1.21 (0.55, 2.65) | 2.56 (0.76, 8.63) | |||
| Pathologic AJCC nodal status | 0.35 | 0.09 | ||||
| N0 | 15.4 | ref. | ref. | |||
| N1 | 32.1 | 0.68 (0.31, 1.51) | 0.25 (0.05, 1.25) | |||
| Nodes removed | 0.06 | 0.08 | ||||
| <5 | 12.2 | ref. | ref. | |||
| ≥5 | 32.1 | 0.46 (0.21, 1.02) | 0.31 (0.09, 1.15) | |||
| Tumor grade | ||||||
| Well/moderate | 17.7 | ref. | ref. | |||
| Poor/undifferentiated | 12.9 | 0.65 (0.22, 1.95) | 0.44 | 0.59 (0.16, 2.20) | 0.43 | |
| Unknown | 20.9 | 1.20 (0.35, 4.09) | 0.77 | 0.99 (0.25, 3.89) | 0.98 | |
| Surgical margins | 0.74 | 0.39 | ||||
| Negative | 19.6 | ref. | ref. | |||
| Positive | 12.7 | 1.18 (0.44, 3.19) | 0.52 (0.12, 2.33) | |||
| Post-op CA 19-9 | ||||||
| <90 | 32.1 | ref. | ref. | |||
| ≥90 | 12.3 | 5.37 (1.74, 16.5) | 0.003 | 5.55 (1.20, 25.7) | 0.03 | |
| Unknown | 11.1 | 2.11 (0.88, 5.06) | 0.09 | 1.32 (0.42, 4.17) | 0.64 | |
| Adjuvant radiation | 0.036 | 0.006 | ||||
| No | 11.3 | ref. | ref. | |||
| Yes | 21.6 | 0.43 (0.20, 0.95) | 0.15 (0.04, 0.58) | |||
Statistically significant P values are in italic. mo, month; UV, univariate; MV, multivariate; HR, hazard ratio; ref., reference.