RecruitingBehavioural interventionAdherence Intervention in Patients With Metastatic Breast CancerTo evaluate the preliminary efficacy of a multicomponent adherence intervention focused on enhancing digital equity and pharmaco-equity among nonadherent patients with metastatic breast cancer (MBC) and cardiovascular disease (CVD) risk factors on endocrine therapy (ET), CDK4/6 inhibitor (CDK 4/6i), and CVD medications. To assess the acceptability and appropriateness of this intervention in patients with MBC and CVD risk factors through validated measures of implementation outcomes. To gain a deeper understanding of the impact of social determinants of health (SDOH) on medication nonadherence through semi-structured interviews with a subset of study participants.