Sorry for the confusion. I have not yet been given an immunotherapy drug. My Multifocal lung cancer consists of multiple independent cancers in the lungs, usually slow growing. Maybe some are metastasis, but they are considered primary for now because not possible to know. When one is getting too big or in bad position, they threat it. I have had two VAT surgeries (one nodule each time, both stage 1 cancers) and one round of SBRT (for 2 nodules).
They mentioned immunotherapy at one point but then took it off the table after my episode of radiation-induced pneumonitis. But it may not always be off the table.
With my additional problem of pulmonary fibrosis, my risk is higher for pneumonitis episodes with various cancer treatments. I will start an antifibrotic drug for the pulmonary fibrosis.
While they need to do a lot of research, the interesting question is whether such drugs might help protect me against pneumonitis outbreaks from any cancer treatments I need. From that one could ask if such a drug could also be useful for "pure" cancer patients against pneumonitis.....of course the answer to that question has got to be a long way off