Cores - Research

Susan Stewart, Ph.D.

Bio Portrait

Susan Stewart

Ph.D.
Program Evaluator and Co-Director Research Core

Susan LeRoy Stewart received an A.B. in applied mathematics and an M.A. and Ph.D. in statistics from UC Berkeley.  Since 1993 her work has focused on biostatistical issues in population-based cancer research, first at the Northern California Cancer Center, then at UCSF, and now at UC Davis.  She has been responsible for the statistical aspects of a number of cancer epidemiology and control projects in Latino, Asian American, African American, and multiethnic populations, including several behavioral intervention trials.  As a result of her involvement in projects in different ethnic communities, she has become particularly interested in issues pertaining to study design and measurement of health-related constructs in diverse populations.  Her investigations have included assessments of the cross-cultural validity of behavioral construct measures and the quality of data in health surveys, as well as the misclassification of ethnicity in a population-based cancer registry. 

She is currently providing advice and guidance on study design issues, survey development, and data analysis to several community based participatory research studies involving the measurement of health-related attitudes and behaviors. These projects include group randomized trials testing lay health worker interventions to promote colorectal cancer screening among Vietnamese, Chinese, Korean, Filipino, and Hmong Americans; an educational intervention to promote breast cancer screening among immigrant Afghan women; and a program project testing interventions to promote hepatitis B testing among Vietnamese, Hmong, and Korean Americans.  Her experience with statistical issues in health disparities research includes serving as biostatistical director for AANCART, the Asian American Network for Cancer Awareness, Research and Training, from 2003-2010 and as the program evaluator for AANCART in its current form as a Community Network Program Center (CNPC) funded by the National Cancer Institute’s Center to Reduce Cancer Health Disparities.  Her activities in the area of measurement and evaluation include chairing the CNPC Core Variables Group, which has the charge of determining a set of common measures that will be reported across the 23 highly diverse CNPCs and used to assess program effectiveness.  Other research interests include assessment of quality of life and evaluation of health promotion interventions for cancer survivors and persons at higher than average risk of cancer.