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June 21, 2018

VIRUSES ASSOCIATED WITH HUMAN CANCER (1)

Cancer may be described as any tumor arising from abnormal and uncontrolled division of cells that then invade and destroy surrounding tissues. Most of them are named after the organ or cell in which they start e.g. liver cancer, cervical cancer, skin cancer etc. Cancers are grouped into: carcinoma when they arise in the epithelium, sarcoma when they involve connective tissues, leukemia with origin in blood or bone marrow, lymphoma arising from B or T lymphocytes (white blood cells), myeloma originating from plasma cells, and central nervous system cancer when the cells of the CNS are involved. Cancer is a…