Comparison between Intensity-Modulated Radiotherapy and Three-Dimensional Conformal Radiotherapy for Their Effectiveness in Esophageal Cancer Treatment: A Retrospective Single Institution Study

Table 4

Multivariate analysis of prognostic factors for EC patients’ overall survival.

Factors	Chi-square	HR	95% CI	value
Chemotherapy	4.867	0.477	0.247–0.921	0.027
Quit drinking	8.378	0.395	0.221–0.741	0.004

EC, esophageal cancer.