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| Metastasis |
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| Initially the tumour shows slow growth, called Latent stage. But later growth rate becomes very rapid, causing overcrowding and damage to normal cells. But later these enter the metastasia stage (stage of secondary growth) in which the cancer extends to the neighbouring tissues like the roots of a tree. Small pieces of primary tumour breaks off and are carried to other parts of the body by blood or lymph, where these form the secondary tumours. This process is called metastasis. |
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| So metastasis is the process of transference of cancerous cells from the site of origin to distant parts of the body. |
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| The most frequent sites of metastasis are lymph nodes, lungs, liver, skin and brain. Metastatic stage usually occurs after the age of 50 yrs, when it is practically impossible to cure and proves to be fatal. |
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| Stages in development of cancer A to D. Primary tumour may become metastatic and get transformed into secondary tumour |
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