In normal health, cells in our body grow and divide as per normal cell cycle and this process is controlled by the nucleus of the cell. The instructions for carrying out this process of division are contained in the genetic material called DNA present in the nucleus of each cell.
At times, the cell’s DNA gets distorted. Usually, DNA repairs itself or instructs the affected cell to die.
However, in malignancy or cancer the component of the cell’s DNA that controls cell division become defective and this damage prevents DNA to carry out its repair and fails to instruct the affected cell to die.
In fact, the damaged DNA stimulates the cell to grow and divide without control into several more defected cells known as cancer cells. This gives rise to the formation of the tumor when the cancer cells multiply and take over the place of the normal cells.
There are around 200 types of cancers or even more that are named after the organ, cell or tissue type they arise from. Although they are found world wide, still certain types are more prevalent in certain areas or at certain time due to the variability and density of the causes.
In nutshell, cancer is a malignant disease characterized by uncontrolled cell division resulting in excess of abnormal cells. These abnormal cells have the ability to invade other tissues by way of cell migration or through vascular system.
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