I'm curious as to why heart cancer is extremely rare?

Unknown: To the best of my l knowledge i don't know that anyone knows the answer to this question.

Guesses?: 1) the heart is a muscle, and muscle tumors are rare 2) the heart is unique in being the only muscle in the human body not to rest - this constant activity may be a protective factor 3) the heart is one of only three organs in the body to use only glucose for energy in its normal function - this may rob the area of the glocose that cancer cells need to grow 4) the constant thumping may deter ca.