I'm not sure about my lungs whether they will stay dorment or not.
I guess you've read up on all this stuff, but basically tumors can be of multiple types, one specific type is stagnant: they do not grow. ever. they just stay the same always. Or at least you die of some other cause before those take your life.
Also, meditation and positive thinking is SIGNIFICANTLY and EMPIRICALLY in regular research linked to reduction in tumor growth and sometimes even stagnation.
I do not know where you live or what your medical coverage is, but there is this thing called "selective immunotherapy" or "immune replacement theory", which I don't know completely how it works (obviously, I'm not a doctor). But it somehow manages to get your body to kill the tumor cells. They are quite advanced with it here in the Netherlands at the AVL (national cancer center). I'm not sure whether it is related to bone marrow, but I guess it probably is.
Anyway, that's my two cents. Sorry if you already knew all of this.