This research trial studies the use of targeted genomic analysis of blood and tissue samples from patients with cancer. Genomic sequencing is a laboratory method that is used to determine the entire genetic makeup of a specific organism or cell type. Genomic sequencing can be used to find changes in areas of the genome that may be important in the development of cancer. It may also help doctors improve ways to diagnose and treat patients with rare cancers with poor prognosis or lack of effective therapy.