Is cancer of the esophagus bad? You need your esophagus to eat and live, right?

Perhaps/no. The severity of esophageal cancer - as most cancers- depends on the stage (extent of spread). Limited disease has a better prognosis. You can live without an esophagus as the stomach is surgically brought up into the chest to allow food to enter the digestive tract.
Novo TTF. The fda (us food and drug administration) has approved a new treatment for patients as an alternative to chemotherapy. The promising new non-invasive treatment by novocure uses "tumor treating fields" (novottf) to treat cancerous growths and is now available for adult patients with recurring brain tumors (recurrent glioblastoma or gbm). This is latest for cancer rx check this out.