Evaluation of [18F]FLT PET/CT as an Early Predictor of Outcome in Pediatric Solid Tumors

Early Phase 1

Withdrawn

Brief Summary: The experimental \[18F\]FLT-PET/CT will be completed before initiation of chemotherapy at either diagnosis or initiation of salvage chemotherapy at relapse and prior to the third cycle (or month) of chemotherapy. Laboratory analysis and correlative radiology, as directed per clinical care based on the primary diagnosis, are required within 30 days of the baseline \[18F\]FLT PET/CT. Follow-up will comprise 24 months of standard practice treatment and follow up.

Detailed Description: Primary Objective is to assess if percentage change in \[18F\]FLT PET/CT quantitative parameters (SUV max, or SUV peak or proliferative tumor volume) after 2 cycles of chemotherapy can predict progression free survival at 1 and 2 years in pediatric patients with newly diagnosed or relapsed solid tumors.

Secondary Objectives are: (1) to assess if percentage change in \[18F\]FLT PET/CT quantitative parameters (SUV max, or SUV peak or proliferative tumor volume) after 2 cycles of chemotherapy can predict overall survival at 2 years in pediatric patients with newly diagnosed or relapsed solid tumors; and (2) for enrolled patients that undergo tumor resection as part of their therapy regimen within one month of the FLT imaging, mitotic index of the tumor will be assessed as compared to initial biopsy specimen and correlate with FLT activity.

Recruitment & Eligibility

Inclusion Criteria

Patients with histologically confirmed solid tumor malignancies with residual tumors present that require standard of care chemotherapy for a minimum number of cycles. All anatomical sites and all tumor histologies are eligible including central nervous system tumors. Both newly diagnosed and/or newly relapsed patients are eligible.
Patients ages 8 - 25 years
In the opinion of the investigator, patients must be thought to be able to lie still for imaging without sedation for 20 - 30 minutes.
Patients must have a performance status of > 50% (Lansky or Karnofsky).
Patients of childbearing potential must have a negative urine or serum pregnancy test as per institution's standard of care within 7 days prior to [18F]FLT PET/CT imaging.
Ability to understand and the willingness to sign a written informed consent/assent.

Exclusion Criteria

Patients with known allergic or hypersensitivity reactions to previously administered radiopharmaceuticals of similar chemical or biologic composition to [18F]FLT
Newly diagnosed subjects who had prior chemotherapy or radiotherapy before enrollment in the study. Relapsed patients are eligible prior to starting their relapsed chemotherapy regimen if they meet the other eligibility criteria.
Subjects for whom chemotherapy is not a standard of care primary therapy option.
Patients who are pregnant or breast-feeding.
Patients with no residual tumor (i.e. complete resection at diagnosis or relapse).

Arm && Interventions

Group	Intervention	Description
[18F]FLT-PET/CT Arm	[18F]FLT-PET/CT	The experimental \[18F\]FLT-PET/CT will be completed before initiation of chemotherapy and prior to the third cycle (or month) of chemotherapy. Laboratory analysis and correlative radiology, as directed per clinical care based on the primary diagnosis, are required within 30 days of the baseline \[18F\]FLT PET/CT. Follow-up will comprise 24 months of standard practice treatment and follow up.

Primary Outcome Measures

Name	Time	Method
Correlation between change in [18F]FLT PET/CT and progression free and overall survival	up to 24 months following treatment	Determine that a positive response (decrease in quantitative parameters) at an interim \[18F\]FLT PET/CT is related to progression free survival and overall survival

Secondary Outcome Measures

Name	Time	Method

Locations (1): The University of Texas Southwestern Medical Center
🇺🇸
Dallas, Texas, United States

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