What Is Cancer More Condition_symptoms Why Does Cancer Appear In Some Places More Frequently Than Others?

Why does cancer appear in some places more frequently than others? - what is cancer more condition_symptoms

For example, people are tumors in the lung, bladder, stomach, intestine, brain, breast and other organs, but saw no one cancer of the fingers, feet, thighs, etc. .. Cancer is expected to be able to develop into any tissue of the body, why should more frequently in certain areas? Can someone explain to me, and I really want to know.