I'm assuming this is about your friend who had cancer??
This is sad if all these people in your life had passed to cancer, I could only imagine the pain that you held in your heart back then from all the things that seemed to be happening in your life.
This poem had a lot of repitition, it shows just how powerful your foe is with the "there is no way of stopping you!" comment. The ending stanza makes me so sad to hear because you were so young when you wrote this... Im glad you never were attacked - Im happy you're alive