I'm hoping on a long shot somebody may know what I'm talking about. I'll definitely add more details if I can recall any.
This is a sarcastic sort of musical, relatively new (within the last 10-15 years I'm almost certain, but say 20 to be extra safe).
I seem to recall someone having gotten cancer in it (possibly something else bad, but cancer sticks out), and that there was a kid (almost positively a girl) with a lot of teenage angst. And that I believe the show revolved around a family including the teenage and the one who got cancer(?) (could easily be one and the same person).
The soundtrack of this was shown to me about five years ago by a girl who was in her late teens (graduating high school) at the time. This is just a shot in the dark, but it may be something relevant to that age group, or at that time. Unfortunately I am no longer in touch with her, and cannot ask her.