The whole movie and you're picking that sentence? I thought it was one of the few good lines.
It honestly didn't bug me until I read Harry Knowles' scathing review. Now everytime I think about that line I can't stop laughing at it. I guess it's just the thought of someone saying that to a cancer patient... it just seems so ridiculously insensitive and cruel and yet we're supposed to root for the guy who says it.