Esophageal cancer

Hello, just signed up for some insight in to this disease. 

My fathers been diagnosed with esophageal cancer today,  He went alone so not sure if he took all the information in. He's had two scans, a biopsy and bloods. The course of treatment he will be having is radiotherapy, then tablets, And not chemotherapy. Dose that mean its not aggressive, to only be offered radium and not chemo? As I've read some post that had both.

Its inoperable and I don't think its curable.