National Cancer Institute Genomic Data Commons infographic. Header reads: "The NCI Genomic Data Commons (GDC) is a knowledge base for cancer that promotes sharing of genomic and clinical data between researchers and facilitates precision medicine in oncology." Below is a timeline of GDC events. Timeline point 1: The GDC brings together harmonized genomic datasets, starting with 3 petabytes of NCI genomic data from TCGA and other initiatives. Timeline point 2: Researchers are encouraged to submit their data.