It all beginns when cells which are not supposed to divide start proliferating again, sometimes uncontroble. These cells sometimes also detach from the initial cell cluster and travel to other parts of the body.

cancer wikipedia

Also, depending on where the cancer evolves, the progression of the disease is more severe or can be treated.

The primary tumor `names´ the disease according to the origin of the cancerogenic cells. Therefore colon cancer has its source of cancer cells in the colon, lung cancer in the lungs and breast cancer if  the breast are the site of origin. If the cancer originates from a solid tissue like organs it is a solid tumor, where as a cancer evolving from blood cells can be leukemia, multiple myeloma or a lymphoma.

Which mutations lead to cancer?

Why do I get mutations leading to cancer?

How does this disease evolve?

What are the details of every single cancer type?

What are the news in cancer treatments?

What is the latest discovery leading to new drugs, treatments or cancer prevention?

Here you will find answers to general questions on cancer. Articles, links, movies and further material will help to make it understandable.

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This video visualizes and resumes the evolvement of cancer: click here