Quantification of Cell-free DNAfor the Analysis of CD19-CAR-T Cells During Lymphoma Treatment
Overview
Authors
Affiliations
Chimeric antigen receptor (CAR)-T cells are increasingly used for the treatment of hematologic malignancies. Treatment success relies highly upon sufficient expansion of CAR-T effector cells. Accordingly, longitudinal quantification of CAR-T cells during therapy is clinically important. Techniques to quantify CAR-T cells in patient blood samples are based on flow cytometry and PCR. However, cellular kinetics of CAR-T cells are very complex and under current investigation. In this study, feasibility of CAR-T cell quantification by cell-free DNA (cfDNA) was analyzed. cfDNA isolated from 74 blood samples of 12 patients during lymphoma treatment with the anti-CD19 CAR-T cell product axicabtagene ciloleucel (axi-cel) were analyzed. Concentrations of cfDNA specific for the CAR-T gene construct (cfCAR-DNA) and a reference gene were quantified by a newly designed digital-droplet PCR (ddPCR) assay. Detection and quantification of cfCAR-DNA was feasible and reliable for all patients included. Relative quantification of cfCAR-DNA compared to a reference gene, suitable for genomic DNA analysis, was heterogeneous in treatment responders and non-responders. In contrast, parallel analyses of cfCAR-DNA and reference cfDNA in a patient-specific approach gave insight into active lymphoma killing and treatment responses. In summary, plasma cfDNA determination in lymphoma patients is a promising tool for future clinical decision making.
Systemic toxicity of CAR-T therapy and potential monitoring indicators for toxicity prevention.
Li J, Chen H, Xu C, Hu M, Li J, Chang W Front Immunol. 2024; 15:1422591.
PMID: 39253080 PMC: 11381299. DOI: 10.3389/fimmu.2024.1422591.
Olejarz W, Sadowski K, Szulczyk D, Basak G Int J Mol Sci. 2024; 25(14).
PMID: 39062986 PMC: 11276786. DOI: 10.3390/ijms25147743.
Editorial: Liquid biopsies in hematological malignancies.
Garcia-Silva S, Marchetti D, Gallardo M Front Immunol. 2024; 15:1440394.
PMID: 38933278 PMC: 11199863. DOI: 10.3389/fimmu.2024.1440394.
Integration of liquid biopsy and immunotherapy: opening a new era in colorectal cancer treatment.
Yao S, Han Y, Yang M, Jin K, Lan H Front Immunol. 2023; 14:1292861.
PMID: 38077354 PMC: 10702507. DOI: 10.3389/fimmu.2023.1292861.
Early quantification of anti-CD19 CAR T cells by flow cytometry predicts response in R/R DLBCL.
Blumenberg V, Busch G, Baumann S, Jitschin R, Iacoboni G, Gallur L Blood Adv. 2023; 7(22):6844-6849.
PMID: 37748131 PMC: 10679803. DOI: 10.1182/bloodadvances.2023010364.