Sadly, this is often the case with people and pets.
I have lots several members of my family to cancer. My grandmother ( Mom's Mom) succumbed to a brain tumor when she was 59, my grandfather had pancreatic cancer and a beloved great-aunt had lung cancer.
Next month is 10 years since my neighbor, fellow cat-lover and dear friend lost her battle to lung cancer. She was only 47. I know she is in Heaven taking care of all the kitties at the Rainbow Bridge.
I pray several times a day that my Mom's cancer does not return and now as my sister begins her own battle I will be praying for her as well. I will also pray that everyone fighting this awful disease wins their battle.