5-methyl-2'-fluoroarauracil F-18 Completed Phase 0 Trials for Stage IV Lung Cancer AJCC v8 / Pathologic Stage IV Cutaneous Melanoma AJCC v8 / Glioma / Stage IVA Colon Cancer AJCC v8 / Anatomic Stage IV Breast Cancer AJCC v8 / Metastatic Breast Carcinoma / Metastatic Kidney Carcinoma / Stage IVB Lung Cancer AJCC v8 / Stage IV Renal Cell Cancer AJCC v8 / Prognostic Stage IV Breast Cancer AJCC v8 / Stage IVC Colon Cancer AJCC v8 / Stage IVA Lung Cancer AJCC v8 / Metastatic Melanoma / Metastatic Colon Carcinoma / Stage IV Colon Cancer AJCC v8 / Stage IVB Colon Cancer AJCC v8 / Brain Metastases / Malignant Brain Neoplasm / Clinical Stage IV Cutaneous Melanoma AJCC v8 / Metastatic Lung Carcinoma Diagnostic