Efficacious adjuvant treatments such as radiotherapy following breast conserving surgery, and chemo- or hormonal therapy for stage 1b or 2 breast cancer improve disease-free and overall survival. Lower rates of radiotherapy following breast-conserving surgery have been reported among black women. Few data exist about racial disparities in receipt of chemo- or hormonal therapies; however, poorer stage-specific survival rates among blacks and among women with poor or no insurance suggest underuse of these treatments. Despite elimination of racial disparities in rates of mammography screening, the full benefit of screening will not be realized unless underuse of effective treatments for early-stage breast cancer is eliminated. Little is known about reasons for underuse of these treatments or ways to increase treatment rates. Our preliminary work suggests omitted referrals and lack of follow-up tracking account for a majority of underuse particularly among minority patients.