"Andy later discovers that he has pelvic cancer, and has approximately one year to live if the hip and leg are not removed. In desperation he sneaks into Stephen's lab and injects himself with the nanobots"
...
"The nanobots continue making "improvements" to Andy, including giving him eyes in the back of his head, bones above his stomach, keen hearing, and jellyfish-like stinging tentacles on his skin."
TLDR:
"Andy later discovers that he has pelvic cancer, and has approximately one year to live if the hip and leg are not removed. In desperation he sneaks into Stephen's lab and injects himself with the nanobots" ... "The nanobots continue making "improvements" to Andy, including giving him eyes in the back of his head, bones above his stomach, keen hearing, and jellyfish-like stinging tentacles on his skin."