Abstract 949: A single stranded DNA library preparation workflow used for hybridization capture based WES assay showed superior uniformity

Abstract Introduction: In many instances in Precision Oncology Medicine fragmented DNA from formalin-fixed paraffin-embedded (FFPE) samples is the only option. The majority of such degradedsamples need to be sequenced using next generation sequencing (NGS) 1. Standardizedguidelines highlight that a minimum of 500 × coverage depth is required for tissue analyses 2. However, coverage isn’t the only metric required for a successful NGS analysis. Highly uniformDNA libraries allow clinical labs to generate more hits from their screens, saving both time andmoney across the course of diagnosis therefore ultimately benefits patient care. The commerciallyavailable single stranded DNA library prep kit tested in this study renders all input moleculessingle-stranded before ligation therefore it recovers template molecules containing DNA nicks andlabile lesions thus maximizing library complexity. Method: 10 solid tumor FFPE derived DNA samples went through three different NGS workflows: 100ng of DNA input in an amplicon-based assay 325 gene panel (Assay A), 60ng input for a 500gene mechanical sheared-based double strand DNA library preparation with hybridization captureassay (~500 gene panel, Assay B), 50ng and 10ng input for a enzymatic shear-based singlestranded DNA library preparation with hybridization capture assay (WES with 1000+ enhancedgene content, Assay C). Data from assays A and C was processed with in-house bioinformaticpipeline, while Assay B’s data was processed with a commercially available bioinformatic pipelinethat was bundled with the assay. NGS QC metrics were compared across the three datasets. Results: This novel single stranded DNA library preparation with hybridization capture workflowshowed superior QC metrics compared to the other two workflows, especially on coverageuniformity and percent target above 100X, with as low as 10ng input. Conclusion: Employing a novel commercially available DNA library preparation workflow in anNGS assay, NeoGenomics was able to rescue poor quality samples that had previously failed tomeet our internal uniformity metric on other NGS assays and generate robust and reportableresults with as low as 10ng DNA input. 1 Nagahashi et al. , J Surg Res. 2017 Dec; 220: 125-132. 2 Cappello et al. , J Pers Med. 2022 May; 12 (5): 750. Citation Format: Jieying Chu, Rachel Schell, Faqiang Wu, Michal Krawczyk, Daniel Whang, Segun Jung, Hyunjun Nam, Kenneth B. Thomas, Fernando J. Lopez-Diaz, Vincent Funari, Julie A. Mayer, Shashi Kulkarni, Jiannan Guo, Steven P. Lau-Rivera. A single stranded DNA library preparation workflow used for hybridization capture based WES assay showed superior uniformity abstract. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts) ; 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84 (6Suppl): Abstract nr 949.