Cancer is an abnormal growth of cells in any tissue or organ of the body. The incidence of cancer is rising alarmingly since a couple of decades because we are exposed to various cancer causing agents, known as carcinogens, in the food we eat, in the water we drink and in the air we breathe. Moreover, life is full of stress, from cradle to grave, that further enhances the risk of cancer by suppressing immune system of the body.