Although collection of DNA samples has been a routine component of the MCTFR assessments for many years, to meet GEDI requirements and supply a fresh DNA sample to the Rutgers University Cell and DNA Repository (RUCDR) it was necessary to obtain new DNA samples. Among the 9515 MCTFR participants who were eligible to provide a DNA sample (e.g., were alive and had not withdrawn from the study), 7278 (76.5%) provided a blood sample and an additional 567 (6.0%) provided a saliva sample. Most of the individuals who did not provide a DNA sample could either not be contacted within the time frame of the GEDI project or had privacy or general concerns over providing a DNA sample for a repository. The RUCDR followed standard DNA extraction and storage procedures in processing the MCTFR samples (Sahota, Brooks, & Tischfield, 2007).
