And cancer has not disappointed in that regard; there's a lot I have learned from it, and I'm grateful for that," she said.In the post, Davis reads out the poem Ring the Bell, which is traditionally read after a patient completes chemotherapy or radiation treatment and rings a bell just once instead of the usual three times.She described the pain she is in and said she would sometimes need to use a wheelchair."The thing that has been most vital to me is humour," Davis said."I asked my friends and family to make fun of me as much as possible (which they're really good at), and most importantly of all to not treat me like a sick person. She said she was not scared of what was next and she planned to continue her work for animal rights.Davis is a long-term vegan and a vocal animal activist In 2007, she posed nude for PETA's campaign against the Guards Division's continued use of traditional bearskin caps.The Office co-star Ricky Gervais left a heart comment on Davis's post."For those of you on a similar journey to mine, I do wish you well," she wrote."Cancer asks a lot from us, physically and mentally