Types of Cancer

There are many types of cancer. Severity of symptoms
depends on the site and character of the malignancy
and whether there is metastasis. A definitive diagnosis
usually requires the histologic examination of tissue by
a pathologist. This tissue is obtained by biopsy or
surgery.

Cancer

Cancer is a class of diseases or disorders
characterized by uncontrolled division of
cells and the ability of these cells to invade
other tissues, either by direct growth into
adjacent tissue through invasion, or by
implantation into distant sites by metastasis.
Metastasis is defined as the stage in which
cancer cells are transported through the
bloodstream or lymphatic system. Cancer
may affect people at all ages, but risk tends
to increase with age, due to the fact that DNA
damage becomes more apparent in aging DNA.
It is one of the principal causes of death in
developed countries.