Explain what is meant by metastasis.

Explanation

Metastasis is shown `"big/Metastatic"` or Malignant tumours. These initially show slow growth, called latent stage, but later growth rate becomes very rapid causing overcrowding and damage to the normal cells. But later these enter 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 break off and are carried to other body parts by the blood or lymph where these form the secondary tumours. This process is called metastasis. So metastasis is the process of transference of cancerous cells from the site of origin to distant parts of the body. The most frequent sites of metastasis are Ivmph nodes, lungs, long bones, liver, skin and brain. Such tumours are very serious and cause the death of the patient due to increasing interference with the metabolic functions of the body and killing of more and more normal cells. Metastatic stage usually occurs after the age of 50 years when it is practically impossible to cure and proves to be fatal.