What is cancer?

 Cancer is a common, colloquial name for malignant tumors caused by the uncontrolled growth of abnormal cells.Cancer cells:
Cancer cells are characterized by an autonomous, uncontrolled and destructive growth and no longer subject to the normal regulative healthy cells. These abnormal cells begin to proliferate and form tumors called (= "hardening").Tumors:

    Benign (benign) tumors.
    Malignant (malignant) tumors.
Benign tumors resemble normal cells, are limited locally, are often encapsulated by the surrounding tissue and represent no immediate danger.
Malignant tumors, however arising out of billions of proliferating cells that were taken from a single original cell that has been divided again and again.
Normally, such a form of biological anarchy is suppressed by a whole system of control measures in the body - but cancer cells are characterized precisely by the fact that they can no longer be subject to the normal regulatory mechanisms.
Unlike benign tumors the malignant cells of malignant tumors leave the place of their origin and may spread beyond the original focus of disease beyond. They invade neighboring tissues, which become established there and destroy it.Metastases:
In such a genetically mutated cells can also penetrate into blood or lymph vessels, settle in other organs of the body and be deported so throughout the body. At these points metastases (secondary tumors) then form so-called. Which in turn damage vital organs until inoperability.
Tumors from malignant cells resemble the course of their development less and less the tissue of origin, and are becoming more aggressive.3 main groups of tumors:
Man divided tumors roughly into 3 main groups, which in turn are subdivided into hundreds of other classes:

    Sarcomas,
    (occur in connective, supporting and nerve tissue such as bone, cartilage, nerves, blood vessels, muscles and fat)
    Carcinomas,
    are the most common cancer in humans; they arise in organs in the glandular breast tissue and prostate, the skin and in the lining of body cavities,
    Leukemia and lymphoma,
    infected blood forming organs such as the spleen and bone marrow.