Feasibility of probe washing after stereotactic needle biopsy as a novel technique for developing cell lines and xenografts of H3 K27–altered diffuse midline gliomas
Julian S. Rechberger
Julian S. RechbergerDepartments of神经细胞ologic Surgery and Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota
H3 K27–altered diffuse midline gliomas (DMGs) are frequently biopsied to obtain tissue diagnosis, inform clinical decision-making, and determine clinical trial eligibility. Tissue yield from biopsies is typically low, leaving little material available for research. To advance understanding of disease biology and promote preclinical testing of novel therapeutics, collecting viable cellular material from treatment-naive tumors is of paramount importance. Here, the authors report the feasibility of a practicable technique for creating DMG cell lines and patient-derived xenografts (PDXs) without the need for additional biopsy specimens. Tumor cells are obtained by probe washing immediately after completion of biopsy. Wash fluid is collected, and viable cells are expanded in vitro. Cultured cells are used to establish PDX rodent models. A total of 5 patient samples were collected by this technique. Viable tumor cells were obtained from 3 of the 5 samples, and cell lines suitable for experiments were obtained within 6–8 months. Orthotopic implantation and flank engraftment was successful in 1 of the 3 established cell lines. Animals harboring intracranial tumors were euthanized due to disease burden 6–7 months after stereotactic injection. Flank tumors formed within 4–5 months and were serially passaged. Molecular and tissue analyses confirmed retention of H3 K27M expression and loss of H3 K27me3 in all cell lines and PDXs.
ABBREVIATIONS
BLI = bioluminescence imaging;DMG = diffuse midline glioma;GEMM = genetically engineered mouse model;PBS = phosphate-buffered saline;PDX = patient-derived xenograft;STR = short tandem repeat;TSM = tumor stem cell medium.
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