Table 1.
Characteristics of patients in the SEER set.
| Variable | Median (IQR)/N (%) |
|---|---|
| Year of diagnosis | |
| 1988-1991 | 1528 (10.0%) |
| 1992-1995 | 2271 (14.8%) |
| 1996-1999 | 2324 (15.2%) |
| 2000-2003 | 3429 (22.4%) |
| 2004-2007 | 3343 (21.8%) |
| 2008-2010 | 2425 (15.8%) |
| Age, years | 70 (60-78) |
| Race | |
| White | 9874 (64.5%) |
| Black | 1882 (12.3%) |
| Other | 3521 (23.0%) |
| Unknown | 43 (0.3%) |
| Gender | |
| Female | 6147 (40.1%) |
| Male | 9173 (59.9%) |
| Tumour location | |
| Cardia | 3455 (22.6%) |
| Upper one-third | 469 (3.1%) |
| Middle one-third | 1257 (8.2%) |
| Lower one-third | 4902 (32.0%) |
| Not specified | 5237 (34.2%) |
| Tumour size, cm | 4.2 (2.5-6.5) |
| Unknown | 2578 (16.8%) |
| Tumour differentiation | |
| Poorly or undifferentiated | 9940 (64.9%) |
| Well or moderately differentiated | 5036 (32.9%) |
| Unknown | 858 (5.6%) |
| T stage | |
| T1 | 3718 (24.3%) |
| T2 | 1943 (12.7%) |
| T3 | 3856 (25.2%) |
| T4a | 4234 (27.6%) |
| T4b | 1569 (10.2%) |
| MLNs | 1 (0-5) |
| THNs | 11 (6-19) |
| NLNs | 8 (3-14) |
| LNR | 0.08 (0.00-0.50) |
| LODDS | -1.61 (-2.94-0.00) |
| Adequate nodal evaluation | |
| No (≤ 15) | 9,641 (62.9%) |
| Yes (> 15) | 5,679 (37.1%) |
SEER, Surveillance, Epidemiology, and End Results database; IQR, interquartile range; MLNs, metastatic lymph nodes; THNs, total harvested lymph nodes; NLNs, negative lymph nodes; LNR, lymph node ratio; LODDS, log ratio of metastatic lymph nodes.