I hope that you're going to be OK in the long term Bulmer. Are the medics going to give you treatment or is it a case of wait and see? I had a similar problem with my prostate but they said at my age (79), it is likely that I will die with it rather than from it. As for the brain tumours in our area, in fact I missed one; there are 3 within 200 yards of our house, plus one bladder cancer and a lung cancer!! I don't know if you have heard about radon gas but there's lots of it in our area and that has a link to cancer. All new buildings in our area have to have a radon gas drain fitted but, of course, the old buildings let it seep through.
Having said all that, it's still a great place to live!!