Table 1. Summary of characteristics of patients in the 4 groups studied.
| Study group by lab method applied | ||||
|---|---|---|---|---|
| Cases studied with Affymetrix U133A/B set (N=53) |
Cases studied with Affymetrix U133A V2 (N=17) |
Cases studied with real time qRT-PCR (N=51) |
Cases studied with tumor tissue microarray (N=275) |
|
| Gender (% male) | 0.64 | 0.35 | 0.61 | 0.66 |
| Age (years, median) | 58 | 53 | 54 | 57 |
| Tobacco use (% yes) | 0.59 | 0.13 | 0.53 | 0.6 |
| Alcohol use (% daily or weekly) | 0.53 | 0.12 | 0.14 | 0.21 |
| Family history of upper gastrointestinal cancer (% yes) | 0.32 | 0.47 | 0.33 | 0.26 |
| Tumor grade (%) | ||||
| 1 | 0.09 | 0.00 | 0.06 | 0.17 |
| 2 | 0.72 | 0.88* | 0.69 | 0.59 |
| 3 | 0.19 | 0.12 | 0.25 | 0.23 |
| 4 | 0.00 | 0.00 | 0.00 | <0.01 |
| Tumor stage (%) | ||||
| I | 0.00 | 0.00 | 0.02 | <0.01 |
| II | 0.25 | 0.24 | 0.24 | 0.12 |
| III | 0.74 | 0.76 | 0.75 | 0.87 |
| IV | 0.02 | 0.00 | 0.00 | 0.01 |
| Lymph node metastasis (% yes) | 0.43 | 0.47 | 0.51 | 0.44 |
*
One case missing information