Hi J
I also have stage 4 lung cancer - the TMN system is just a way of describing the tumour and spread.
I haven't had radiation but I would guess they are doing it to try and reduce tumour size and thus relieve symptoms.
I was diagnosed 4.5 years ago at the age of 54. And I'm still here. There are lots of treatments arou d these days, and even though the cancer is terminal, life expectancy can be increased considerably. Hoping you and your dad hang in there!
Gail
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