When is it normal to have surgery for lung cancer followed y radiation but no chemo?

Positive margins: Positive surgical margins, meaning some disease is left behind. Radiation can be used to sterilize the field. Sometimes radiation is given to treat the regional lymph nodes as well.

Positive margin: If a patient had early stage cancer that surgery would be the definitive treatment, but after pathology comes back showing a positive margin then radiation would be used without chemotherapy. However more adverse findings such as nodes would mean chemotherapy is necessary.

S+RT but no C: Not at all common. The case i can imagine is a person unable to tolerate the chemotherapy. The most common clear indicaton for radiotherapy in lung cancer is after chemotherapy if med. Nodes +. Positive bronchial margins or chest wall invasion are other plausible scenarios.

Lung cancer and xrt: I usually see this when there is a question of close or questionable surgical margins. That means the surgeon thinks he got all of the tumor but isn't quite positive.