Protein kinases have important role in cell proliferation & differentiation of cell. They involved in diverse biological processes like growth, differentiation, metabolism and apoptosis in response to external and internal stimuli, mediator of signaling cascade. Tyrosine kinases are enzymes that selectively phosphorylates tyrosine residue in different substrates. Over expression of these tyrosine kinases receptor cause development of human cancer. So lot of work is done to understand role of tyrosine kinases in the pathophysiology of cancer. Defective regulation of growth processes plays a role in the genesis and progression of most type of cancer. Oncogenic activation of tyrosine kinase due to mutation, autocrine-paracrine stimulation in cancer cells can be blocked by selective tyrosine kinase inhibitors and thus considered as a promising approach for treatment of cancer. This review describes the role of growth factors in development of cancer & the role of TK inhibitors or growth blockers on treating cancer. This review article describes the mechanism of action, structures, and side effects of potent protein kinase inhibitors.
