(a)Cancer is one of the most dreaded disease of humans.Explain 'Contact inhibition' and 'Metatasi 'with respect to the disease

(a)Cancer is one of the most dreaded disease of humans.Explain ‘Contact inhibition’ and 'Metatasi 'with respect to the disease.
(b)Name the groups of genes which have been indentified in normal cells that could lead to cancer and how they do so?
©Name any two techniques which are useful to detect cancers of internal organs.
((d)Why are cancer patients often given $\alpha $-interferon as part of the treatment?

(a)Contact with other cells inhibits their unctrolled growth.Tumour cells reach distant sires, through blood.
(b)Proto oncogenes.
When activated under certain condition could lead to oncogenic transformation of the cells.
©Biopsy/radiography/CT/MRI
(d)It activates immune system, destroys tumour.