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247 Background: (Neo)Adjuvant chemotherapy decreases the risk of recurrence and improves overall survival among breast cancer patients; however, delays in chemotherapy initiation are associated with adverse outcomes. The causes of delay are complex and include interrelated social, economic, cultural, environmental, and health system factors . Project Start was a qualitative study designed to assess and identify the multilevel factors contributing to the barriers and facilitators of chemotherapy initiation. Methods: English or Spanish-speaking women, ≥18 years, diagnosed with primary invasive breast cancer experiencing (neo)-adjuvant chemotherapy initiation delay ( ≥60 days) were included. Participants completed semi-structured interviews designed to explore perceptions about individual, community, and system-level barriers and facilitators contributing to chemotherapy initiation. Interviews were audio-recorded, transcribed verbatim, and coded using the Sort and Sift, Think and Shift qualitative approach to identify concepts and themes within and across transcripts. To supplement qualitative data, sociodemographic data and health literacy/numeracy, physician trust, and social support questionnaires were obtained. Results: Participants (n = 22) identified as: Latina (n = 8); Black (n = 5); and non-Latina White (n = 9). While the interview guide included questions addressing chemotherapy delays, explicit insight into chemotherapy delay was rare. Participants described barriers and facilitators at the patient, family, medical, and community levels. Barriers at the patient level included patient’s hesitancy to initiate chemo due to shock, fear, and denial. Within the family level, we learned of participant’s family roles (e.g., caregiving, income), treatment costs, and the need for emotional support (e.g., not shutting family members out). Participants sought out and relied heavily on support from their communities (e.g., churches, other patients, survivors). Patients described their reliance on the medical team for information, the trust needed to navigate their treatment process, and the challenge of managing information associated with their treatment. Participants described the importance of self-efficacy to take an active role in treatment. Conclusions: Project Start is informing the design of a pilot study aimed to test the acceptability and feasibility of a navigation intervention. Using facilitators and barriers identified from Project Start, we are developing a checklist that will serve as a tool to identify the support each patient needs. Once areas of need are identified, appropriate referrals will be made in a personalized and culturally sensitive way with the goal of increasing self-efficacy and activating patients to avoid treatment delays.

6525 Background: Inadequate access to healthcare services is associated with worse outcomes. Disparities in access to cancer care are more frequently seen among racial/ethnic minorities, uninsured patients, and those with low socioeconomic status. A provision in the Affordable Care Act called for expansion of Medicaid eligibility in order to cover more low-income Americans. In this study, we evaluate the impact of Medicaid expansion in 2-year mortality among metastatic BC patients according to race. Methods: Women (aged 40-64) diagnosed with metastatic BC (stage IV de novo) between 01/01/2010 and 12/31/2015 and residing in states that underwent Medicaid expansion in 01/2014 were identified in the National Cancer Database. For comparison purposes, 2010-2013 was considered the pre-expansion period and 2014-2015 the post-expansion period. We calculated 2-year mortality difference-in-difference (DID) estimates between White and non-White patients using multivariable linear regression models. Results are presented as adjusted differences (in % points) between groups in the pre- and post-expansion periods and as adjusted DID with 95%CI. Covariates included age, comorbidity, BC subtype, insurance type, transfer of care, distance to hospital, region, residence area, education, income quartile, facility type and facility volume. In addition, overall survival (OS) was evaluated in pre- and post-expansion periods via Kaplan-Meier method and Cox proportional hazards models; results are presented as 2-year OS estimates, hazard ratios (HRs), and 95% CIs. Results: Among 7,675 patients included, 4,942 were diagnosed in the pre- and 2,733 in the post-expansion period. We observed a reduction in 2-year mortality rates in both groups according to Medicaid expansion. Among Whites 2-year mortality decreased from 42.5% to 38.7% and among non-Whites from 45.4% to 36.4%, resulting in an adjusted DID of -5.2% (95%CI -9.8 to -0.6, p = 0.027). A greater reduction in 2-year mortality was observed among non-Whites in a sub-analysis of patients who resided in the poorest quartile (n = 1372), with an adjusted DID of -14.6% (95%CI -24.8 to -4.4, p = 0.005). In the multivariable Cox model, during the pre-expansion period there was an increased risk of death for non-Whites compared to Whites (HR 1.14, 95% CI 1.03 to 1.26, P = 0.04), however no differences were seen in the post-expansion period between the two groups (HR 0.93, 95% CI 0.80 to 1.07, P = 0.31). Conclusions: Medicaid expansion reduced racial disparities by decreasing the 2-year mortality of non-White patients with metastatic breast cancer and reducing the gap when compared to Whites. These results highlight the positive impact of policies aimed at improving equity and increasing access to health care.