What is a method some tumors use to evade restriction of their growth by secreting substances that cause blood vessels to grow toward them?

Cells are the part of human body which grows and divide to make new cells. They are the basic requirement of body and body wants them. Usually, cells die after sometime when they are broken or become too old. Then, formation of new cells take place and they take the place of older ones. When the genetic variation interfere with the orderly arrangement of cells, cancer starts to form. Cancer cells start growing in a uncontrollable way. These cells might type a mass known as a growth. A growth is cancerous or benign. A cancerous growth is malignant, which means it will grow and unfold to alternative components of the body. A benign growthsuggests that the tumor will grow however won't unfold.