To cite a few instances, polymerase chain reaction (PCR), a molecular
method developed over three decades ago, has been widely applied in disease
diagnosis, disease mechanism deciphering, and prognosis prediction; the elucidation of tyrosine kinase activity in cancer cells has led to the development of
novel drugs for cancer treatment; and the identification of proteins and genetic molecules by molecular
methods as biomarkers for disease
diagnosis and prognosis has been drawing great interest.