Abstract 2857: Patient-derived cells (PDCs) and organoids (PDOs) as platforms for screening novel therapeutics for NSCLC
Authors: Joo Yunjoo , Park Sewon , Lee Ju-hyeon , Yun Mi Ran , Yu Mi Ra , Synn Chun-Bong , Oh Seung Yeon , Lee Eun Ji , Kim Dong Kwon , Lee Seul , Lim Kyumin , Hong Min Hee , Lim Sun Min , Kim Chang Gon , Lee Ji Yun , Lee Jii Bum , Cho Byoung Chul 
Published: June 2023

Abstract
Purpose: Patient-derived cells (PDCs) and organoids (PDOs) are constructed from patient tissue to mimic the biological features of patients. In cancer research, PDC/PDOs have been crucial as they can recapitulate tumor mutations. As heterogeneity between traditional cell lines and the human body leads to clinical trial failure, PDC/PDOs are widely used for predicting the preclinical drug efficacy. The aim of this study is to show that the PDC/PDOs can be used as effective tools for screening novel therapies on non-small cell lung cancer (NSCLC).
Experimental design: PDC/PDO models from malignant effusions were established as following. We succeeded the establishment with samples which are positive for malignancy in cytology tests and tumor colony formation. Genotypes are analyzed by Sanger sequencing, Whole exome sequencing, or RNA-sequencing. Cell viability assay was performed using currently approved drugs or drugs in clinical development or their combinations.
Results: A total of 46 PDCs and 150 PDOs was established from NSCLC patients, including models harboring sensitizing EGFR mutations, ALK fusions, ROS1 fusions, EGFR exon20 insertion, BRAF V600E, and those harboring various resistance mechanisms to EGFR-TKIs (T790M, C797S/C797G, MET amplification), to ALK-TKIs (G1202R), and to ROS1 TKI (G2032R). Osimertinib-resistant YU-1097 harboring EGFR resistance mutation (E19del/T790M/C797S) revealed sensitivity to BLU-945 (IC50, 108nM), a novel fourth-generation EGFR-TKI. A similar inhibition of cell viability was observed with repotrectinib (IC50, 21nM), a next-generation ROS1-TKI and lorlatinib (IC50, 9nM) in YU-1078 harboring CD74-ROS1, whereas more robust tumor regression was seen with repotrectinib in YU1078-derived xenograft model. Amivantamab, a EGFR-MET bispecific antibody, showed a robust activity in YU-1163 and YUO-036 in vitro and in vivo. YU-1077 harboring ALK G1202R solvent-front mutation showed sensitivity to NVL-655, a next-generation ALK-TKI, with a potency &gt; 10-fold than that of lorlatinib. YUO-010 with MET amplification following osimertinib was sensitive to RGEN 5093-M114, a METxMET bispecific antibody-drug conjugate.
Conclusions: PDC/PDO models can be utilized for evaluating activity of novel agents and will accelerate novel drug development in NSCLC.
Citation Format: Yunjoo Joo, Sewon Park, Ju-hyeon Lee, Mi Ran Yun, Mi Ra Yu, Chun-Bong Synn, Seung Yeon Oh, Eun Ji Lee, Dong Kwon Kim, Seul Lee, Kyumin Lim, Min Hee Hong, Sun Min Lim, Chang Gon Kim, Ji Yun Lee, Jii Bum Lee, Byoung Chul Cho. Patient-derived cells (PDCs) and organoids (PDOs) as platforms for screening novel therapeutics for NSCLC [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 2857.