P1 Cancer is a disease that begins as an abnormal human cell which the body cannot control. Cell growth needs to be strictly regulated for the body and its organs to function properly. Cancer cells, however, continue to divide and multiply at their own speed, forming abnormal lumps or tumors. An estimated 6.7 million people currently die from cancer every year.
P2 Not all cancers are natural-born killers. Some tumors are not dangerous because they don't spread elsewhere in the body. But cells of dangerous tumors destroy other healthy tissues and will continue to do so if it is not treated.
P3 Cancers can start in almost any body cell, due to damage or defects in genes that cause abnormal cell growth. What actually stimulates these cell changes remains unclear, but scientists believe that diet, lifestyle, virus infections, exposure to harmful chemicals, and abnormal genes are important factors .