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The most common form of dementia among older people is Alzheimer’s
disease, which initially involves the parts of the brain that control
thought, memory, and language. Although scientists are learning
more every day, right now they still do not know what causes Alzheimer’s
disease, and there is no cure.
Mesothelioma is a rare form of cancer in which malignant cells
are found in the mesothelium, a protective sac that covers most
of the body's internal organs. The latest information indicates
most people who develop mesothelioma have worked on jobs where they
inhaled asbestos particles.
The mesothelium is a membrane that covers and protects most of
the internal organs of the body. It is composed of two layers of
cells: One layer immediately surrounds the organ; the other forms
a sac around it. The mesothelium produces a fluid that lubricates
the area between these layers, allowing moving organs (such as the
beating heart and the expanding and contracting lungs) to glide
easily against adjacent structures.
Breast cancer is a type of cancer where cells in the breast tissue
divide and grow without the normal control. About 80 percent of breast
cancers originate in the mammary ducts, while about 20 percent arise
in the lobules [5]. Cancerous tumors in the breast usually grow very
slowly so that by the time one is large enough to be felt as a lump,
it may have been growing for as long as ten years.
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