Table 7. Multivariate analysis of factors for survival in upper, middle, and lower thoracic ESCC.
| Factor | Upper | Middle/lower | |||||
|---|---|---|---|---|---|---|---|
| HR | 95% CI | P value | HR | 95% CI | P value | ||
| Vascular invasion (P/N) | 2.827 | 1.083–7.376 | 0.034 | – | – | – | |
| Differentiation (H-HM/M-ML) | – | – | – | 0.900 | 0.489–1.657 | 0.736 | |
| Tumor size (<5/≥5 cm) | 0.834 | 0.300–2.321 | 0.729 | 0.947 | 0.496–1.911 | 0.939 | |
| T stage (T1–2/T3–4) | 2.111 | 0.739–6.031 | 0.163 | 2.220 | 1.113–4.425 | 0.024 | |
| TNM stage (I–II/III–IV) | 1.613 | 0.441–5.895 | 0.470 | 4.968 | 1.627–15.170 | 0.005 | |
| Total lymph nodes (P/N) | 1.119 | 0.328–3.823 | 0.857 | 0.344 | 0.129–0.921 | 0.034 | |
| Supraclavicular lymph nodes (P/N) | 1.380 | 0.422–4.507 | 0.594 | 3.152 | 1.376–7.222 | 0.007 | |
ESCC, esophageal squamous cancer; M, male; F, female; H, high differentiation; M, medium differentiation; L, low differentiation; P, positive; N, negative.