LAMB2 and neoplasm: With the importance of the tumour microenvironment being a critical feature of a tumour, it was important to investigate whether the peptide gel model allowed the PDX-derived cells grown within it to generate their own extracellular matrix, ensuring an individualised matrix more relevant to the patient than a generic murine basement membrane extract (BME) Immunofluorescent staining of the gels for one such molecule, laminin, was performed at G5.