Cancerversary Key Calendar NecklaceCelebrate your Cancerversary with a Calendar Key. Its the perfect milestone keepsake gift to yourself, a family member or close friend to acknowledge an incredibly important date in theirs. People acknowledge milestones in their cancer survivorship and treatment in a variety of ways. For some, the one year and five year cancer free dates are very important though other special dates may be remembered too, such as the end of chemotherapy or radiation,