Cancer is a class of diseases characterized by out-of-control cell growth. There are over 100 different types of cancer, and each is classified by the type of cell that is initially affected.Cancer harms the body when damaged cells divide uncontrollably to form lumps or masses of tissue called tumors. Tumors can grow and interfere with the digestive, nervous, and circulatory systems, and they can release hormones that change the body function. Tumors that stay in one spot and demonstrate limited growth are generally considered to be less harmful.
More dangerous, or bad tumours form when two things occur:
- a cancerous cell manages to move throughout the body using the blood or lymph systems,destroying healthy tissue in a process called invasion
- that cell manages to divide and grow, making new blood vessels to feed itself in a process called angiogenesis
When a tumor successfully spreads to other parts of the body and grows, invading and destroying other healthy tissues, it is said to have metastasized. This process itself is called metastasis, and the result is a serious condition that is very difficult to treat.
ref: http://www.medicalnewstoday.com/info/cancer-oncology/whatiscancer.php
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