Multimodal Machine Learning Characterization of Solid Tumors

This is an observational imaging study to evaluate the value of multimodal \[18F\]DCFPyL positron emission tomography and magnetic resonance imaging (PET/MRI) for solid tumor characterization and disease staging. This research study involves: * Screening visit, and 1-3 study Multimodal \[18F\]DCFPyL PET/MRI visits * Two cohorts of participants will be enrolled in this study: primary prostate cancer patients and patients with known or suspected solid tumors (hepatocellular carcinoma, glioma, clear cell renal carcinoma) * It is expected that about 135 people will take part in this research study * The PET dye used in this study is called \[18F\]DCFPyL. \[18F\]DCFPyL is approved by the U.S. Food and Drug administration (FDA). * The PET/MRI scanner was approved by the U.S. FDA.