Here's some brainstorming...
When I think of being cancer free- I think of strong women, tenacity, a celebration of life, longevity, family - what's important, achieving goals, climbing mountains.
Oh yes and I know that is a far cry from an idea for a party game but you could stretch it that way - like have everybody write down the one place on earth they have always wanted to go to/see in person but have not been and then write them all down and everybody guesses who's is whose.
decor - that we can do it poster with Rosie the Riveter
Okay I'm done for now.