Sadly, I don't have the information about the author of 'Cancer Vixen: A True Story' at my fingertips. It could be that the author is a cancer survivor who felt compelled to write about their own journey in order to raise awareness, offer hope, or simply to share their story with others who might be going through a similar situation. It might also be a family member or a friend of the patient who wanted to give a more personal and in - depth look at what it's like to deal with cancer from the sidelines.
I'm afraid I don't know the exact author of 'Cancer Vixen: A True Story'. However, it could be the person who had the cancer experience and decided to share it with the world. Or it might be someone who was involved in the care or support of that person and wanted to document their story.