AFP and neoplasm: Tumor growth rate in time, AFP level, tumor margin findings at computed tomography (CT) or magnetic resonance imaging (MRI) views, 18F-labeled fluoro-2-deoxyglucose positron emission tomography (18F-FDG PET) findings, response to other previous treatments, histopathological differentiation (if there was a biopsy) and age of the patients were the parameters we interpreted before making the decision.