Abstract
Introduction
We hypothesized that engineering a combined lymph node/melanoma organoid from the same patient would allow tumor, stroma, and immune system to remain viable for personalized immunotherapy screening.
Methods
Surgically obtained matched melanoma and lymph node biospecimens from the same patient were transferred to the laboratory and washed with saline, antibiotic, and red blood cell lysis buffer. Biospecimens were dissociated, incorporated into an extracellular matrix (ECM)-based hydrogel system, and biofabricated into three dimensional (3D) mixed melanoma/node organoids. Cells were not sorted, so as to preserve tumor heterogeneity, including stroma and immune cell components, resulting in immune-enhanced patient tumor organoids (iPTOs). Organoid sets were screened in parallel with nivolumab, pembrolizumab, ipilimumab, and dabrafenib/trametinib for 72 h. LIVE/DEAD staining and quantitative metabolism assays recorded relative drug efficacy. Histology and immunohistochemistry were used to compare tumor melanoma cells with organoid melanoma cells. Lastly, node-enhanced iPTOs were employed to activate patient-matched peripheral blood T cells for killing of tumor cells in naïve PTOs.
Results
Ten biospecimen sets obtained from eight stage III and IV melanoma patients were reconstructed as symbiotic immune/tumor organoids between September 2017 and June 2018. Successful establishment of viable organoid sets was 90% (9/10), although organoid yield varied with biospecimen size. Average time from organoid development to initiation of immunotherapy testing was 7 days. In three patients for whom a node was not available, it was substituted with peripheral blood mononuclear cells. iPTO response to immunotherapy was similar to specimen clinical response in 85% (6/7) patients. In an additional pilot study, peripheral T cells were circulated through iPTOs, and subsequently transferred to naïve PTOs from the same patient, resulting in tumor killing, suggesting a possible role of iPTOs in generating adaptive immunity.
Conclusion
Development of 3D mixed immune-enhanced tumor/node organoids is a feasible platform, allowing individual patient immune system and tumor cells to remain viable for studying of personalized immunotherapy response.
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Acknowledgements
We wish to thank Libby McWilliams (Procurement Manager), Kathleen Cummings (Protocol and Data Manager), and the Wake Forest Advanced Tumor Bank Shared Resource. A.S. acknowledges funding through the Wake Forest Clinical and Translational Science Institute Open Pilot Program, supported by the National Center for Advancing Translational Sciences (NCATS), National Institutes of Health, through grant award no. UL1TR001420. A.S. and K.I.V. acknowledge funding through the Comprehensive Cancer Center at Wake Forest Baptist Medical Center’s Clinical Research Associate Director Pilot Funds, and services from the Tumor Tissue and Pathology Shared Resource supported by the Comprehensive Cancer Center at Wake Forest Baptist Medical Center’s NCI Cancer Center Support Grant P30CA012197.
Funding
The work was supported by Wake Forest Comprehensive Cancer Center Pilot Fund.
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Votanopoulos, K.I., Forsythe, S., Sivakumar, H. et al. Model of Patient-Specific Immune-Enhanced Organoids for Immunotherapy Screening: Feasibility Study. Ann Surg Oncol 27, 1956–1967 (2020). https://doi.org/10.1245/s10434-019-08143-8
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DOI: https://doi.org/10.1245/s10434-019-08143-8