CHEEC provided data support for the Mammography Surveillance Pilot Study conducted in Scott County, Iowa. The study evaluated the feasibility of performing population-based mammography surveillance by identifying and linking Scott County patients receiving screening and diagnostic mammograms with their breast tissue pathology reports and breast cancer experience. 1993 is the study year. Specific aims of the study are: (1) Assess use and effectiveness of breast cancer mammography in Scott County for 1993, (2) Determine the need for changes in the practice of screening and in the workup of women with positive screening tests, and (3) Evaluate the feasibility of performing studies of biologic characteristics of screen-detected breast cancers and non-screen detected breast cancers. The Mammography Surveillance Pilot Study is participating in a consortium of similar surveillance studies. The consortium is committed to sharing common protocol, study design, and research objectives as well as comparable data collection procedures.