
Cancer is one of the most ancient and dreaded diseases like
diabetes mellitus disease and
herpes simplex infection. Cancer is characterized by the inability of cells to self-terminate. This results to the uncontrolled growth and reproduction of cells. These cells become threats to the healthy cells. Cancerous cells may either take over the normal metabolisms of healthy cells or kill them by competing with them for nutrients.
Cancer cells are reverted forms of cell to undifferentiated state. Cancer cells also do not have the intercellular cohesion that normal cells have.
Cancer cells commonly develop from continually reproducing tissues such as skin and blood. However, cancers may also develop in relatively stable tissues such as the brain. The mechanism of cancer development is partly known. Scientists have discovered that cancer cells are anaerobic -- they do not use free oxygen in their metabolism. Scientists postulated that this anaerobic nature of cancer cells causes hyper-acidity in cellular level. This hyper acidity damages the genetic structure of cells, further producing other cancer cells. The development of cancer cells are also known to be triggered by chemicals known as carcinogens. For instance, lung cancer can be triggered by cigarette smoking.