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CHARACTERISTICS OF CANCER

Cancer can develop in any organ of the body. The most important characteristic of many cancers is the development of a new growth, a nodule or a tumour in the tissues of their origin. The other features of cancer are that the original tumour or growth has a remarkable tendency to form colonies at some distant parts of the body. This tendency of forming tumours elsewhere in the body makes the disease extremely difficult for satisfactory treatment.
There are two types of tumours known as Benign and Malignant. Only malignant tumours are termed as cancers. They do not have capsules or limiting membrane. They therefore, invade and destroy the tissues in which they occur.
They reproduce their cells in a disorderly and uncontrolled way. The cells are of a more primitive type than the originating tissue. The rate of growth is unusually rapid. They are capable of producing secondary growths in parts of the body remote from the original tumour.
Benign tumours are opposite to malignant growth. They have capsules of fibrous tissues and do not invade normal tissue. They reproduce themselves in orderly ways. The cells resemble the tissue in which they originate. The rate of growth of benign tumour is slow and they stop spontaneously. They do not spread, except by direct extension. They are not fatal, except perhaps in the skull. They only produce ill-effects by occupying space and pressing on adjacent normal tissue.
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