What is life expectancy of lung cancer patient?

Can be high. Small size, peripheral, squamous cell can be cured. 70-90% at five years depends on cell type- small cell cancer is still a bad actor. Many variables better to answer with cell type- biopsy and imaging= staging to look for any distant mets.
Lung cancer. There are many factors involved, such as the stage of cancer, wether it is treatable with surgery or chemotherapy, the condition of the patient, age of the patient.