Imaging and Blood Biomarker Evaluation of Engraftment after Allogeneic Hematopoietic Stem Cell Transplant, REVEAL Study

Active:	Yes
Cancer Type:	Hematopoietic Malignancies	NCT ID:	NCT03541889
Trial Phases:	Phase I	Protocol IDs:	OUHSC4891-19 (primary) NCI-2020-13763
Eligibility:	4 - 59 Years, Male and Female	Study Type:	Diagnostic
Study Sponsor:	Children's Healthcare of Atlanta - Egleston
NCI Full Details:	http://clinicaltrials.gov/show/NCT03541889

Summary

This trial aims to find new tests that could help determine if newly infused bone marrow cells are growing well after bone marrow transplant (hematopoietic stem cell transplant) or if new bone marrow cells are needed in patients who have undergone or will undergo a bone marrow transplant. The process of bone marrow transplant involves giving chemotherapy and or radiation that removes healthy blood stem cells and leukemia or cancer cells. Then, healthy blood stem cells from another person are infused through a vein (usually through a central line). These cells travel to the bone marrow, the factory of the blood, and make new blood cells, including white blood cells, red blood cells, and platelets. This process typically takes 4-6 weeks. During this time, there is currently no way to tell if the new cells have settled in the bone marrow and are generating cells that can be seen in the blood or if they are not growing well and more blood stem cells may be needed. One of the risks of bone marrow transplant is that the newly infused cells don’t grow and make new white blood cells (neutrophils). In this case, the risk of infections is very high. This risk more often occurs when the donor is mismatched (such as when the half-matched parent or sibling is donor) or cord blood donor is used, and patients are undergoing a transplant with one of these donor sources. Usually, doctors wait for about 4 weeks to give the cells a chance to grow, and then, if the new cells have not grown, the process begins to find (or collect), and give new blood stem cells. Diagnostic procedures, such as 18F-FLT PET/CT and blood tests (such as TK-1), may help doctors understand what is happening inside the bone marrow. Information gained from this trial may help doctors learn if these tests could be used to help diagnose when new blood stem cells do not grow (marrow failure) earlier which could help treat patients earlier.

Objectives

PRIMARY OBJECTIVE:
I. Evaluate whether fluorothymidine F-18 (FLT) uptake distinguishes delayed from graft failure after hematopoietic stem cell transplantation (HSCT).

SECONDARY OBJECTIVES:
I. Map the cellular pathway to subclinical engraftment after cord blood and haplo-identical engraftment using FLT imaging, identifying the earliest marrow site of settling (Arm A).
II. Evaluate the safety of FLT for patients at highest risk for graft failure (Arms A and B).
III. Evaluate safety of FLT for patients at highest risk for graft failure.
IV. Determine whether levels of TK1, an investigational blood biomarker, correlate with graft failure, or delayed engraftment, compared to those with on-time engraftment.
V. Explore whether cellular, cytokine, or chemokine markers of subclinical engraftment.
VI. Explore whether FLT uptake or biomarker studies correlate with relapse of malignant disease or residual disease or correlates with other significant HSCT events such as sinusoidal obstructive disease of the liver, graft-versus-host disease, and infections.

OUTLINE: Patients are assigned to 1 of 2 arms.

ARM A (CORD BLOOD AND HAPLO-IDENTICAL RECIPIENTS): Patients receive fluorothymidine F-18 intravenously (IV) and undergo positron emission tomography (PET)/computed tomography (CT) over 95 minutes on day -1 (the day before HSCT), and days 9 and 28 after HSCT. Patients also undergo collection of blood samples on day -1 (the day before HSCT), and days 9 and 28 after HSCT.

ARM B (NON-ENGRAFTED RECIPIENTS): Beginning 20 days after cord or haplo-identical HSCT, patients receive fluorothymidine F-18 IV and undergo PET/CT over 95 minutes once. Patients also undergo collection of blood sample on the day of imaging scan and at engraftment (if possible).

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