Tumors

__** Tumors **__ A tumor is an abnormal growth of body tissue, which can be solid or fluid-filled. Tumors can be found in many different shapes and forms and can be found almost anywhere in the body. Normal cell growth and division is supposed to be strictly controlled, but tumors excessively grow and divide.

Tumors and the formations of tumors are very important to the topic of cellular physiology. If we study cancerous and tumor cells, there maybe be a outbreak one day in which we can find out exactly how to stop tumors from growing. So far in this day and age, we already have an idea of what causes them and how to treat them. Hopefully preventing tumors and cancerous cells are in the near future.
 * __ Important to Cellular Physiology? __**


 * __ Forms: __**
 * Benign- Not dangerous/Not cancerous
 * Pre-Malignant- Pre-Cancerous
 * Malignant- Cancerous



__** Causes: **__
 * Genetic problems
 * Radiation
 * Viruses
 * Excessive exposure to sunlight
 * Obesity
 * Environmental toxins

__** History of Tumors: **__ In 1911, a scientist by the name of Peyton Rous discovered an avian virus that induced tumors in chickens. In 1930 two scientists, Richard Shope and John Bittner identified mammalian tumor viruses. This then sparked tumor virology, which helped develop the idea that this could be the same in humans.