Immunotherapy or radiotherapy for lung cancer?

Thanks for taking time to read my post.

All information, suggestions or ideas will be greatly appreciated.

My gran who’s my world and more has been diagnosed with stage 4 lung cancer that is inoperable. It’s broken our family, but we are remaining positive.

It’s also in her lymph and breathing is now an issue. I do daily wim hof and yogi pranayama breathing with her, which helps.

My questions;

She’s waiting to find out if she can have immunotherapy on the nhs, if this is not possible can you go private and any idea of costs involved?

Nan has been offered radiotherapy, which I would be more keen for her to try than chemo to help with the breathing. Would anyone recommend her to have the radio or hold out for the immunotherapy?

Are there any new clinical trials out there of drugs or treatment for lung cancer?

Peoples thoughts on vitamin C weekly intrevenus to flood the system with vitamin C?

I posted a message previously but had no response? As mentioned any feedback would be greatly appreciated.