Joseph Gordon-Levitt Has A 50/50 Shot At Surviving Cancer?.

…in this new movie he stars in with Seth Rogen.
So, to clarify, Joseph Gordon-Levitt does not have cancer - but his character in the movie 50/50 does.
You know what, just watch the trailer. It looks like a pretty solid movie.
Check out the trailer for 50/50 (above), starring Seth, Joseph, Anna Kendrick, Bryce Dallas Howard, [...]

Source: http://perezhilton.com/2011-05-27-joseph-gordon-levitt-50-50-trailer-seth-rogen