Cancer already known as malignant tumor is a class of diseases in which a group of cell display uncontrolled growth, invasion, and sometimes metastasis .Most cancers form tumors but some, like leukemia, do not. Cancer affects people of all ages with the risk for most types increasing with age. Cancer caused about 13% (7.6 million) of all human deaths in 2007.Cancers are classified by the type of cell that resembles the tumor, and therefore, the tissue presumed to be the origin of the tumor. The general categories are:
CARCINOMA – Cancer that begins in the skin or in tissues that line or cover internal organs such as lung, breast and colon cancer.
SARCOMA – Cancer that begins in bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue.
LYMPHOMA AND MYELOMA- Cancers that begin in the cells of the immune system. Central nervous system cancers – cancers that begin in the tissues of the brain and spinal cord.
GERM CELL TUMOR – Tumors derived from tot- potent cells. In adults most often found in the testicles and ovaries, in the fetuses, babies, and young children most often found on the body midline, particularly at the tip of the tail bone, in horses most often found at the poll(base of the skill)
BLASTIC TUMOR OR BLASTOMA – (Usually malignant)which resembles an immature or embryonic tissue. Many of these tumors are most common in children.
WHAT ARE THE CAUSES OF CANCER
Cancer is the result of cells that uncontrollably grows and do not die. Normal cells in the body follow an orderly path of growth, division, and death. When this process breaks down, cancer begins to form. Unlike the regular cells, cancer cells do not experience pragmatic death and instead continue to grow and divide. This leads to a mass of abnormal cells that grow out of control, bulging out of the skin, forming unwanted bumps with regular or irregular shapes inside the body of the victim. Cancer is very dangerous and the factors that leads to it is best to be examined to enable people know the reasons why cancer comes into a body.