sentences:  RFQs were primarily used for the collection of retrospective samples from established banks while RFPs are used for the prospective collection of samples.TCGA finalized sample collection in December, 2013, with nearly 20,000 biospecimens.Institutions that contribute samples to TCGA are paid, and have access to molecular data generated on their samples, while maintaining a link between the TCGA unique identifier and their own unique identifier.This permits contributing institutions to link back to the clinical data for their samples and to enter into collaborations with other institutions that have similar data on TCGA samples, thus increasing the power of outcome analysis.