Cancer is a filtered word as it’s never used in an appropriate sense in a gaming forum. 99.999% of the time it’s used in a context I find absolutely repugnant. Similar to the use of autism as a slur against people who aren’t as good as other players (which more often than not couldn’t even be less true) or is thrown at a poster when they’re upset and venting in the forums. Piss is just in there because it’s a ‘bad word’ filter. Just because bad language is used in the (mature rated) game, doesn’t make it acceptible for the (not mature rated) forums.
If the word filter triggers on a post - firstly we ask not to bypass it with accented characters 
Secondly, consider if there is a way to say what you’re trying to say without triggering the filter (and moderators, and other users) in the process.