Introduction
tumors, ESCC
OESOPHAGEAL SQUAMOUS CELL CARCINOMA, TUMORS
The incidence of esophageal squamous cell carcinoma (ESCC) has increased steadily among patients aged 70 years and older, who account for 30% to 40% of all patients with ESCC worldwide.In addition to the advanced staging technique leading to better patient selection, advanced radiation techniques, extensive application of intensity-modulated RT (IMRT), and image-guided RT have improved survival outcomes compared with the era of conformal RT.S-1 is an orally administered chemotherapeutic drug that has been widely used in East Asia since several studies demonstrated promising effectiveness and safety in patients with digestive system tumors.