Right now, cancer is one of the most feared diseases in the world. In the early 1990s almost 6 million new cancer cases developed and more than 4 million deaths from cancers occurred. Also more than one-fifth of all deaths were caused by cancer and it has been predicted, by the American Cancer Society, that about 33% of Americans will eventually develop this disease. This is a huge disease that is killing people all over the world.
The field of cancer study is called Oncology. The government has spent billions of dollars on research of this fatal disease. Cancer is the most aggressive disease of a larger class known as neoplasms. Neoplasms do not fully comply with the parts of the cell that control the growth and functions of the cell. These cells eventually become abnormal growths and can be recognized as not normal tissue. These traits are passed down as the cell reproduces therefore spreading the cancer.
Neoplasms are generally classified into two groups: malignant and benign. Malignant tumors, or abnormal tissue, grow more rapidly than benign tissue and they invade normal tissue. Benign tissue is structured similar to normal tissue while malignant tissue is abnormal and has an unstructured appearance. Of greater importance, benign tissue does not metastasize, or begin to grow in other sites, like malignant tumors do. Cancer always refers to metastasized tumors but the term tumor is not always necessarily cancer. A tumor is any living tissue that is distinguishable as abnormal living tissue. After a cancer forms, it can also change from a benign to a malignant state, therefore making the cell grow at a more rapid rate. The development of the cell starts when it forms notable abnormalities in chromosomes and then multiplies exceedingly. Then metastasis usually occurs and generally causes the death of the host. There are many different cancers which form on just about all parts of the body. In the US, skin cancer is the most common cancer, then...
Bibliography: Compton 's Encyclopedia(1992). Cancer . Chicago: Compton 's Learning Company
Encyclopedia Britannica(1992). Cancer. Chicago: Encyclopedia Brittanica, Inc.
American Cancer Society website(1996): http://www.cancer.org/acs.html
Please join StudyMode to read the full document