- clonoSEQ Tracking (MRD) Testing in the peripheral blood revealed early signs of relapse post-transplant
- Patient achieved remission after CAR-T trial
- Patient continues to be monitored for MRD with peripheral blood samples
- Diagnosed 9 months post-partum
- Refractory to Hyper-CVAD + Linker regimen
- Received allogenic transplant in late 2014
- Post-transplant flow cytometry results were MRD-negative for an additional three months while clonoSEQ peripheral blood and bone marrow results were MRD-positive
- Patient could enroll in CAR-T trial as the relapse was detected early and the patient still met the study eligibility criteria
“When we rely on morphology alone, we are often surprised when a patient’s bone marrow looks beautiful at day 180 post-transplant and then six months later they show up with circulating blasts, so post-transplant, it is my standard of care to assess the patient’s MRD by clonoSEQ. This patient was MRD-positive in the peripheral blood 6 months post-transplant. MRD continued to rise in additional follow-up assessments in the peripheral blood and bone marrow. It is important to note that during this 3-month period of positive clonoSEQ (MRD) Tracking Test results, the patient was flow cytometry MRD-negative. As we could identify the impending relapse early based on the rising trend in MRD, I decided to refer the patient for the trial. I continue to monitor the patient’s MRD in the peripheral blood about every 2-3 months.”*
*Clinician has received compensation to participate in advisory meetings sponsored by Adaptive. Clinician’s research has also been supported, in part, via product grants.
Use of the clonoSEQ Assay
Transplant physician sent bone marrow sample for clonoSEQ (ID) Test so that clonoSEQ (MRD) Tracking could be carried out post-transplant.
Day 90 post-transplant, the patient was MRD-negative by clonoSEQ.
3 months later, the clonoSEQ (MRD) Tracking Test revealed the presence of measurable residual disease (MRD).
Repeat peripheral blood and bone marrow clonoSEQ results were MRD-positive. During this time, the patient was MRD-negative by flow cytometry.
Patient enrolled in CAR-T study.
Post-CAR-T therapy, the patient was MRD-negative in the bone marrow.
The patient continues to be monitored by clonoSEQ Tracking (MRD) Test in the peripheral blood every 2-3 months, and was MRD-negative as of the latest assessment.
Blood-based MRD testing for patients with acute lymphoblastic leukemia is available as a CLIA-regulated laboratory developed test (LDT) service provided by Adaptive Biotechnologies. This use of clonoSEQ has not been approved or cleared by the FDA.
*This case study was based off results generated from an earlier version of the clonoSEQ Assay.
The clonoSEQ Assay is an in vitro diagnostic that uses multiplex polymerase chain reaction (PCR) and next-generation sequencing (NGS) to identify and quantify rearranged IgH (VDJ), IgH (DJ), IgK and IgL receptor gene sequences, as well as translocated BCL1/IgH (J) and BCL2/IgH (J) sequences in DNA extracted from bone marrow from patients with B-cell acute lymphoblastic leukemia (ALL) or multiple myeloma (MM), and blood or bone marrow from patients with chronic lymphocytic leukemia (CLL).
The clonoSEQ Assay measures minimal residual disease (MRD) to monitor changes in burden of disease during and after treatment. The test is indicated for use by qualified healthcare professionals in accordance with professional guidelines for clinical decision-making and in conjunction with other clinicopathological features.
The clonoSEQ Assay is a single-site assay performed at Adaptive Biotechnologies Corporation in Seattle, Washington.
Special Conditions for Use:
- For in vitro diagnostic use.
- For prescription use only (Rx only).
ALL, MM, and CLL
- MRD values obtained with different assay methods may not be interchangeable due to differences in assay methods and reagent specificity.
- The results obtained from this assay should always be used in combination with the clinical examination, patient medical history, and other findings.
- The clonoSEQ Assay is for use with specimens collected in EDTA tubes.
- Results may vary according to sample time within the course of disease or by sampling site location.
- The assay may overestimate MRD frequencies near the limit of detection (LoD).
- The MRD frequency LoD varies based on the amount of gDNA that is tested and using lower gDNA input may prevent MRD detection at low frequencies.
- Sample processing and cell enrichment strategies may affect the measured MRD frequency.
- The volume and cellularity of sampled input material may affect the ability to detect low levels of disease.
- False positive or false negative results may occur for reasons including, but not limited to: contamination; technical and/or biological factors such as the type of rearrangement or the size of the junction region.
- The assay has been validated with the Illumina NextSeq500 and 550.
- MRD is based on measurements of tumor cells detected in peripheral blood and/or bone marrow. However, patients may have significant residual disease in unassessed compartments and U-MRD in one compartment cannot fully rule out the presence of disease in the other compartment, for example, U-MRD in blood may not be the same in bone marrow. Therefore assessment of MRD in CLL should employ a multimodal approach including clinical examination, patient medical history, and other findings.
- Outcome for patients with MRD detectable in bone marrow but not in peripheral blood (PB-/BM+) may differ according to type of therapy.
- This assay is capable of monitoring specific tumor clonotypes. The association between MRD assessments and patient clinical status for the purpose of monitoring changes in disease (e.g., relapse, remission, stable disease) has not been demonstrated.
- The value of MRD in CLL for previously untreated or “watch and wait” patients is not established.• CLL is a heterogeneous disease. MRD values and expectations for outcome may not be generalizable across treatments. Changes in MRD should be interpreted with caution when used to evaluate disease burden in therapies that have not been validated.
- Regardless of MRD status, cytogenetics play an independent role in patient risk status and its impact on PFS/OS.
For important information about the FDA-cleared uses of clonoSEQ including test limitations, please visit clonoSEQ.com/technical-summary.