Sanjiv Sam Gambhir , M.D. , Ph.D. , Director of the Canary Center at Stanford for Cancer Early Detection , Director of the Molecular Imaging Program at Stanford ( MIPS ) , Head of the Division of Nuclear Medicine , and Member of Bio-X Program and Departments of Radiology & Bioengineering , co-authored the " Matrix-insensitive protein assays : pushing the limits of biosensors in medicine " paper that will appear in the October 2009 edition of Nature Medicine . The paper proves that the magneto-nanosensors are over 1,000 times more sensitive and effective than the current " gold " standard , ELISA ( enzyme-linked immunosorbent assays ) .