My dad in May was diagnosed with cancer, he's 63, brain and lung, the brain tumour was successfully removed and he is about to have radiotherapy to ensure nothing has been left. 

The brain and lung cancer are not related despite loads of tests being carried out on the brain tumour. He has now been classed as a CUP Cancer of Unknown Primary. Basically the primary doesn't exist or growing to slow and too small to be picked up. 

10 weeks ago he was just a normal dad and now he's quite poorly, always been active, had a busy active job etc.

The hospital said all they can do is keep him well for as long as they can, it's incurable.

I know this cancer is rare but any advice would be so appreciated.