a) Cancer is one of the most dreaded diseases of humans. Explain 'Contact inhibitions' and Metastasis' with respect to the disease.
b) Name the group of genes which have been identified in normal cells that could lead to cancer and how they do so?
c) Name any two technique which are used to detect cancers of interorgans?
d) Why are cancer pateints often given a-interferon as part of the treatment.

Explanation

Contact inhibition refers to the phenomenon by which, the contact with other cells inhibits the uncontrolled growth of the cancerous cells. In Metastasis, the tumour cells reach the distant organs site through the blood. The group of gene are oncogenes. When activated under certain conditions there is oncogenic transformation of cells. The techniques to detect cancers are Biopsy, Radiography, CT and MRI through which the presence of cancer can be detected. The alpha interferon activates the immune system and destroys the tumours, so it is given to the cancer patients as the part of the treatment.