Molecular Residual Disease Assessment in a Representative Diverse Population of Patients With Early-stage Breast Cancer

Ultimately, the goal is to improve treatment strategies for this patient population. Detecting minimal residual disease (MRD) is a promising approach to identifying patients at increased risk of recurrence after definitive therapy, who may benefit from the escalation of their treatment and remain potentially curable with effective local and systemic therapy. Circulating tumor DNA (ctDNA), found in blood plasma, has recently emerged as a noninvasive approach for disease monitoring and detecting MRD through tracking tumor mutations. Nodal involvement is correlated with ctDNA positivity across multiple cancer types, and therefore, the use of ctDNA may capture patients who are more likely to have additional involvement of unresected axillary lymph nodes and can benefit from additional adjuvant therapies. One goal of this project is to investigate the clinical utility of using ctDNA as a biomarker to help tailor adjuvant radiation and systemic therapy in breast cancer (BC) patients with nodal disease, especially luminal subtype N1 BC, a group for which there is limited data available regarding the best treatment approach. As such, the primary objective of this study is to evaluate the prevalence of ctDNA-based MRD status in all patients by defining the proportion of patients with MRD-only recurrence post-operatively. Tumor tissue will be collected at surgery for genetic analysis. Blood samples for ctDNA testing will be taken at enrollment every three months. ctDNA results will be kept from treating physicians. Researchers will retrospectively analyze the relationship between ctDNA levels, administered treatments, and cancer recurrence. A dedicated cohort of this study will enroll only African American/Black patients with early-stage, node-positive breast cancer of any subtype, who proceeded to surgery as their first treatment modality. The rationale for this cohort is to increase diversity in genomic research in Black populations, where more aggressive breast cancers are diagnosed, and non-invasive methods could provide novel insights for cancer treatment. There is a paucity of data on ctDNA prevalence and dynamics in Black patients with breast cancer, and this will be the first study of its kind to study ctDNA in Black patients. This study will provide information on ctDNA prevalence in early-stage breast cancer with 1-3 positive lymph nodes.