What is esophageal cancer?

Esophageal cancer is a disease in which malignant (cancer) cells form in the tissues of the esophagus. It can occur anywhere along the esophagus but typically starts at the inside lining of the esophagus and spreads outward through the other layers as it grows. Esophageal cancer is often in an advanced stage when it is diagnosed.
https://www.healtheo360.com/condition/esophageal-cancer/