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August 21, 2018

CANCER

Cancer is a disease characterized by out-of-control cell growth. There are over 100 different cancer types and each one is classified by the type of the cell that is initially affected. Cancer harms the body when damaged cell divides uncontrollably to form lump or masses of tissue called TUMORS. Tumors can grow and interfere with the digestive, circulatory and nervous system, and they can release hormones which disrupt body function. Some tumors stay in one spot and demonstrate limited growth. These tumors are considered to be benign.   A malignant (dangerous) tumor form when i.      A cancerous cell manages to…

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…