Please assess the completion status of the following clinical trial:

Trial Title: A Pilot Study of 18F-FLT in Pediatric Patients With Central Nervous System (CNS) Tumors

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: DIAGNOSTIC
- Time Perspective: None
- Masking: NONE
- Phase: PHASE1
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* Pediatric patients with newly diagnosed central nervous system tumors undergoing planned surgical resection within 21 days.~* Patients should be \< 21 years of age at the time of diagnosis.~* Patients should be capable of achieving imaging without the need for sedation or anesthesia.~* Karnofsky Performance Status ≥ 50. For infants, the Lansky play scale ≥ 50% can be substituted.~* Patients must not be pregnant or nursing.~* Signed Informed Consent.~* Patients receiving steroids and/or anti-seizure medications are eligible for this study.~Exclusion Criteria:~* Prior radiation therapy and/or chemotherapy are not permitted.~* Active infection~* Pregnancy or breast feeding~* Serious concurrent medical illness

- Gender: ALL
- Minimum Age: None
- Maximum Age: 21 Years
- Healthy Volunteers: f

Study Arms:
- 18F-FLT (Type: EXPERIMENTAL): All subjects will receive 18F-FLT prior to PET imaging.

Based on this trial design, predict the completion outcome and termination type (if applicable).