My cat should have been dead years ago

One of my cats was diagnosed with cancer and give a month to live .... 4 years ago. An ultrasound picked up a growth on his intestine. The expensive biopsy came back inconclusive. The wee bastard is still around. He refuses to be beaten.

There have been a couple of times when I have felt his number is up, I give him a deadline, if he is not better in a few days it is off to the vet for the long goodnight, I don't want to see him suffer.

He rallies, picks himself up and is back to normal, eating me out of house and home.