Can't say that any film has moved me to tears but a few documentaries have come close.
Alex A Life Fast Forward by the BBC which is about a young man who was diagnosed with bone cancer at 17. Really devastating to see how quickly he deteriorated. I'll link it because it deserves to be watched.
There was also a documentary about Seve Ballesteros' cancer battle last year on the BBC which was difficult to watch.
Just watched that and was absolutely fine until the post it note at the end.....
rotters