Table 1.
Characteristics of the 4494 patients with ESCC.
| Characteristic | No. of patients (%) |
|---|---|
| Age at hospital registration (years) | |
| Median | 60 |
| Range | 28-80 |
| Gender | |
| Male | 3606 |
| Female | 889 |
| Histology | |
| Well-differentiated squamous carcinoma | 252 |
| Moderately differentiated squamous carcinoma | 1754 |
| Poorly differentiated squamous carcinoma | 1093 |
| Grade unknown | 1395 |
| Stage of primary tumor | |
| In situ | 15 |
| Extension/lymph node involvement | 2513 |
| Distant involvement | 1966 |
| Treatment of primary tumor | |
| Surgery ± adjuvant radiotherapy/chemotherapy | 2269 |
| Chemoradiotherapy/chemotherapy/radiotherapy | 2225 |