What is Cancer? (Cancer Part I)

Cancer is the result of cells that grow uncontrollably and do not die. normal cells in the body following the path of orderly growth, division, and death. Programmed cell death called apoptosis, and when this process is damaged, the cancer begins to form. Unlike regular cells, cancer cells do not experience the death of the program and instead continue to grow and divide. This causes the mass of abnormal cells that grow out of control.

Cancer harm the body when cells are damaged divide uncontrollably to form a lump or mass called a tumor tissue (except in cases of leukemia where the cancer prohibit normal blood function with abnormal cell division in the bloodstream). Tumors can grow and interfere with the digestive system, nerves, and blood circulation, and they can release hormones that alter the function of the body. Tumors that stay in one place and shows limited growth is generally considered benign.

More dangerous cancer cells, or malignant, tumors formed when two things happen:

Cancer cells successfully move the entire body using blood or lymphatic system, destroying healthytissue in a process called invasion
Successful cells divide and grow, creating new blood vessels to feed themselves in a process calledangiogenesis.

When the tumors had spread to other parts of the body and grow, invade and destroy healthy tissue, said to have spread. The process itself is called metastasis, and the result is a serious condition that is very difficult to treat.

Taken From Medicalnewstoday