David Chaffin, Principal Scientist at Roche Tissue Diagnostics located in Tucson Arizona; received a B.S. degree in Biochemistry from Purdue University and a PhD in Biochemistry from the University of Iowa. David was both a Cancer Center and NIH postdoctoral fellow at the University of Rochester. David is the technical lead for pre-analytics. This project aims to provide standardization of routine tissue collection. Efforts have focused on ways to optimize tissue fixation providing high quality with exceptional turn-around time and higher medical content. David holds several patents on automated immunohistochemistry as well as novel fixation protocols.His group is doing at RTD in the field of tissue preservation of solid tumors and the preanalytical variables that need to be improved. His team is working for 9 1/2 years in this area, developing technologies to help standardize collection of cancer tumors and understanding scientifically how these preanaytical variables play a role in FFPE tissues.