![Radioimmunoassay](/sites/default/files/assets/cancer-history/images/1280px-Lymph_node_with_almost_complete_replacement_by_metastatic_melanoma.jpg)
1971
AD
A radioimmunoassay made to detect alpha-fetoprotein, a tumor marker often found in higher concentrations in those with liver and testicular cancer, was created for screening purposes by Ruoslahti and Seppala.1