Developing preclinical peptide hydrogel models of breast cancer metastasis to bone using patient-derived tumour cells and xenografts

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Human tumours have complex interplay between the extracellular matrix (ECM) and cellular components. The Clarke lab has used patient-derived xenograft (PDX) tumour models in immune-deficient mice to recapitulate complex microenvironments, including the bone metastatic niche (Eyre et al., Nature Comm., 2019). However, PDX models are subject to limitations including a lack of immune function and human tumour interaction with a mouse microenvironment. The need for a superior in vitro alternative is pressing considering the dominance of PDX models as a tool for personalized therapy. 'Xeno-patient' cohorts are the most clinically relevant animal models in cancer drug discovery (Byrne et al., Nature Reviews Cancer, 2017). Even with its limitations, the breast cancer field uses xenograft models routinely. An alternative is to use breast organoids grown in vitro from patient-derived breast cancer cells or xenografts (Sachs et al., Cell, 2018; Guillen et al., BioRxiv, 2021). The organoids will be encapsulated in peptide hydrogels, which we anticipate will be superior to matrigel (gold standard) since its stiffness can be tuned to match breast cancer ECM physical states. The peptide gel technology, will be modified with or without osteogenic factors to model the bone metastatic niche. In addition, human cellular and extracellular matrix components will be introduced with patient-derived breast cancer cells to create a functional and amenable in vitro platform for multiple applications. These applications include investigating bone metastatic breast cancer biology and screening of targeted therapies in clinically relevant patient samples, providing a platform for precision medicine and testing of personalised treatments.