b'I N T R O D U C T I O NMinimal Residual Disease TestsMinimal Residual Diseases (MRD) testing has shown strong potential for the optimizationof therapeutic management of lymphoproliferative diseases. Currently, MRD tests complement and leverage the information obtained at diagnosis. Due to their increased sensitivity, these measurements are most useful at time points where they are compared and contrasted with more traditional methods. An example of this is before transplant, when MRD levels have been shown to be predictive of transplantation success.Several patient-specific PCR-based (e.g. ASO-PCR) and flow cytometric technologies have been developed by regional test centers in order to routinely assess MRD levels during the course of therapy. However, ASO-PCR requires patient- and tumor-specific primer and probe sets, making it cost prohibitive and impossible to offer as a standardized method. Flow cytometryeven more sensitive multiparameter flow cytometry protocolsare difficult to standardize between testing centers. Neither of these methods meet the internationally recognized criteria for a standardized, quantitative measure of residual disease and therefore do not meet the standards required to take them through the regulatory agencies. Next-Generation Sequencing (NGS) methods have recently been developed for the detection and monitoring of MRD. These forefront technologies use regulatory-compliant chemistries, run on regulatory-compliant instruments, and can be interpreted using regulatory compliant, and design-controlled bioinformatics software. Due to the read depth of this non-biased patient agnostic testing approach, ultra deep sequencing overcomes virtually all of the shortcomings of other MRD technologies, providing internationally harmonized MRD testing for virtually any targeted biomarker.LabPMMs MRD tests are NGS-based assays that can be used to detect clonal gene rearrangements identified at diagnosis within virtually all of the antigen receptor loci(B- and T-cells). Once a specific rearrangement sequence (the clonotype) has been identified in a primary sample, bioinformatics tools allow for objective longitudinal tracking of clonal populations with a sensitivity up to 1 x 10 -6 , provided sufficient DNA is tested. Sensitivity (limitof detection) is determined by the number of cell equivalents of DNA that are interrogated and the number of sequencing reads generated per sample. LabPMM also offers FLT3 ITD and NPM1 MRD assays, which are used for the detectionof targeted mutations. These sensitive NGS-based assays reliably detect sequences presentat 5 x 10 -5 .LabPMM Services Catalog 2021|35'