Dec 27, 2010

Cancer 101

Well, tomorrow is going to be a big day for Chuck. We meet with Dr. Y around noon. We hope that he will be able to present his game plan for us. He has read the CT scan and the PET scan reports and, hopefully, spoken with all of our other doctors. We also have a few questions that we need to ask of him. After meeting with him, I hope we will have a better idea of what this round will be like.

So, in anticipation of our meeting with Dr. Y, I am going to give you a little lesson about cancer that we will call: Cancer 101

Cancer is a term used for diseases in which abnormal cells divide without control and are able to invade other tissues. Cancer cells can spread to other parts of the body through the blood and lymph systems.

Cancer is not just one disease but many diseases. There are more than 100 different types of cancer. Most cancers are named for the organ or type of cell in which they start -- for example, cancer that begins in the colon is called colon cancer; cancer that begins in basal cells of the skin is called basal cell carcinoma.

Cancer types can be grouped into broader categories. The main categories of cancer include:

  • Carcinoma -- cancer that begins in the skin or in tissues that line or cover internal organs.

  • Sarcoma -- cancer that begins in bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue.

  • Leukemia -- cancer that starts in blood-forming tissue such as the bone marrow and causes large numbers of abnormal blood cells to be produced and enter the blood. Tumors are typically not found in this type of cancer.
  • Lymphoma and myeloma -- cancers that begin in the cells of the immune system.

  • Central nervous system cancers -- cancers that begin in the tissues of the brain and spinal cord.
All cancers begin in cells, the body's basic unit of life. To understand cancer, it's helpful to know what happens when normal cells become cancer cells.

The body is made up of many types of cells. These cells grow and divide in a controlled way to produce more cells as they are needed to keep the body healthy. When cells become old or damaged, they die and are replaced with new cells.

However, sometimes this orderly process goes wrong. The genetic material (DNA) of a cell can become damaged or changed, producing mutations that affect normal cell growth and division. When this happens, cells do not die when they should and new cells form when the body does not need them. The extra cells may form a mass of tissue called a tumor.

  • Benign tumors aren't cancerous. They can often be removed, and, in most cases, they do not come back. Cells in benign tumors do not spread to other parts of the body.


  • Malignant tumors are cancerous. Cells in these tumors can invade nearby tissues and spread to other parts of the body. The spread of cancer from one part of the body to another is called metastasis.
(Thanks to MedicineNet.com for their explanation.)

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