Table IV.
Relative 1- and 2-year survival rates.
| Cumulative CI | |||||
|---|---|---|---|---|---|
| Survival rate | Histological type | Relative survival ratea (%) |
SE (%) | Lower (%) | Upper (%) |
| 1-year | |||||
| MC | 92.70 | 4.90 | 73.20 | 93.20 | |
| PDA | 70.50 | 0.60 | 72.50 | 74.80 | |
| UDA | 69.90 | 2.40 | 64.70 | 74.60 | |
| 2-year | |||||
| MC | 73.80 | 10.40 | 44.50 | 89.20 | |
| PDA | 58.40 | 0.80 | 62.40 | 65.30 | |
| UDA | 53.10 | 3.30 | 51.40 | 64.30 | |
a
Relative survival rates derived from survival session of the SEER*Stat software, using SEER 17 registry (1973–2006) by Kaplan-Meier methods (with no adjustment to heterogeneity), with adjustments made when cumulative relative survival rates are higher than the prior period. MC, medullary carcinoma (n=43); PDA, poorly differentiated adenocarcinoma (n=7,497); UDA, undifferentiated adenocarcinoma (n=453); SE, standard error; CI, confidence intervals (95%).