JACOPIN / BSIP / SCIENCE PHOTO LIBRARY JACOPIN / BSIP / SCIENCE PHOTO LIBRARY
Illustration of the formation of metastases : The primary tumour is in the breast. The primary cancer tumour develops : Step 1, the tumour is still small in size Step 2, the tumour has grown, the cancer cells have multiplied and transformed. Step 3, the tumour has grown even more. The cells with irregular nucleus are mature cancer cells (metastases) which will spread to other parts of the body through the blood vessel network. In the case of cancer of the kidneys or colon, the metastases can remain dormant for several years in the lungs, or can proliferate immediately and form a secondary cancer tumour.
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