This is a prospective cohort study with the goal of obtaining fresh tumor biopsies and one blood sample from patients with a confirmed histological or cytological diagnosis of cancer, who are potential candidates for a phase I or II clinical trial at their local institution. DNA from fresh tumor biopsies and from mononuclear blood cells will be subjected to targeted and genome-wide sequencing to enable molecular characterization of tumors. Application of genomic information by investigators will be captured. Archived tumor samples will be requested from all patients. For patients with malignant ascites or pleural effusions, fluid and tumor samples will be evaluated.