Study to Establish the Diagnostic Performance of 18F Fluciclovine PET in Detecting Recurrent Brain Metastases

Inclusion Criteria:

1. Eastern Cooperative Oncology Group (ECOG) performance status of 0-1, or 2 if this is an acute deterioration
2. Previous history of solid tumor brain metastasis of any origin
3. Histopathological confirmation of the primary solid tumor or a metastatic site within 4 years
4. Previous radiation therapy of brain metastatic lesion(s)
5. A reference lesion considered by the site investigator to be equivocal for recurrent brain metastasis
6. Patient requires further confirmatory diagnostic procedures to confirm brain MRI findings and is planned for biopsy/neurosurgical intervention as standard of care (SoC) or clinical follow-up as SoC

Exclusion Criteria:

1\. Patients with a history of active hematological malignancy