This weekend, Seth Rogen stars in '50/50,' a quasi-comedy about a friend with cancer. Two years ago, Seth Rogen starred in 'Funny People,' a quasi-comedy about a friend with cancer. As a result, there is actually a genre of film now called "Seth Rogen's friend has cancer." So, is the Adam Sandler vehicle at all like Rogen's latest film, co-starring Joseph Gordon-Levitt? And if so, which "Seth Rogen's friend has cancer" film is better? Now that Moviefone has seen both films, let's compare the similarities and differences of '50/50' and 'Funny People.'