Subjects are identified from pathology reports extracted from VISTA. It has been determined that pathology reports alone are not a sufficient source of identifying cases because not all patients coming to VA for treatment have diagnostic pathology completed at the Durham VA. Therefore, we have added additional protocols for subject identification such as reviewing radiation/oncology clinic records for those subjects referred for radiation treatment. To-date, 78 cases and 66 controls have been enrolled in the study. To increase accrual rates, in-home visits have been used when necessary, and the Richmond, VA and Asheville, NC VAMCs have been added as participating study sites. Due to patient accrual problems and project staffing changes, the Durham ERIC has granted this study a six-month, no-cost extension through 7/31/2001.