Sensitivity of Organoids to Predict Treatment Outcome in Breast Cancer Metastases

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The SOTO-BC trail is an observation study and the patients will continue their clinical visits and follow-up as per normal standard of care. Patient cohorts: 1. Breast cancer patients with brain metastases undergoing surgical resection with or without further radiotherapy (SRS or whole brain radiotherapy) 2. Breast cancer patients with extra-cranial metastases undergoing surgical resection or biopsy Primary objective: To assess the percentage of successful generated organoids from resected brain or resected/biopsied extra-cranial metastases of breast cancer patients Secondary objectives: 1. To assess the sensitivity of radiotherapy in PDOs 2. To assess the sensitivity of the same systemic treatments that the patients previously had and will have in PDOs 3. To correlate the treatment sensitivities of PDOs above with the treatment outcome of patients 4. To correlate IC50 doses/dose response curves above with the objective response rates of patients undergoing same systemic treatment Study Procedures: Breast cancer patients with resectable brain or extra-cranial metastases or who will undergo a biopsy of the extra-cranial metastases will be asked to consent for this study and for their resected/biopsied samples to be used to generate PDOs. The investigators aim to recruit 20 patients in the pilot phase of the study. When the PDOs contain sufficient cells, these cells will be treated with increasing doses of radiotherapy and/or relevant systemic treatments in order to determine the IC50 and to obtain dose-response curves of these PDOs to the treatments. The investigators will treat the PDOs with the same treatments that the patients had or will receive in order to correlate the responses to radiotherapy and/or systemic treatments including immunotherapy (co-cultured with immune cells). The response of these PDOs will be compared to the treatment outcome and survivals in these patients.