Oncology is the branch of medicine that focuses on the study, treatment and prevention of tumor diseases. The tumor - an abnormal formation of the body, consisting of cells which have lost their inherent structure and properties and begin uncontrolled growth. In oncology, the tumor divided into benign and malignant.

Cells were differentiated benign tumors almost the same as the healthy tissue cells, i.e. they have preserved structure and function, but disrupted control cell division. Such tumors have clear boundaries and do not destroy the surrounding tissue, and can even compress the internal organs, disrupting their work. Benign tumors are treated surgically or medically, usually after treatment, they do not recur. Danger mainly in that in some cases they may ozlokachestvlyatsya.

Malignant tumors composed of atypical cells, ie cells that have lost the features of typicality, or differentiation. Such cells are divided randomly and can penetrate into the surrounding healthy tissue, causing their destruction. Also, they are able to metastasize, that is spread through the blood or lymph, and sometimes along the nerve pathways to form daughter tumors. The cancer causes destruction of the tissues and the formation of toxic products of necrosis, poisonous organism, so the disease, characterized by the formation of malignant tumors, have severe course.

In oncology is crucial early and accurate diagnosis. Risk of cancer is that in the early curable stages are usually "silent" and not cause concern. Therefore, caution should be exercised oncology, and the appearance of the first signs of the tumor to see a doctor. It is important to undergo regular medical examinations.

Malignant tumors in advanced stages are considered incurable. In the initial stages, the tumor is quite treatable. Cancer treatment is carried out primarily by surgery, in addition to operation using medications that suppress the growth of cells - cytotoxic drugs and radiation therapy, based on the fact that the abnormal cells susceptible to damage from exposure to the radiation doses that are relatively harmless to healthy cells. Integrated use of all three methods is usually to successfully cope with the disease.

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