Moving from GDC to ISB-CGC

If you’ve been using the National Cancer Institute’s Genomic Data Commons Portal you’ve probably discovered that while you can identify patients and files that might be interesting, the analysis options are limited and you need to download files to your own system in order to do anything unique.

But isn’t the point of having data on the cloud that you shouldn’t have to download anything?

Fortunately, since the ISB-CGC stores data from the GDC, you can do your analysis on the cloud without having to move data at all! The only thing you need from GDC is a case manifest or a file manifest and in the following tutorials, we’ll show you how to turn those manifests into usable analysis starting points.

Differences between GDC and ISB-CGC

Since the GDC is mostly aimed at storing data and the ISB-CGC is aimed at making use of that data there are some differences between the two that you need to understand before starting:

  • While the ISB-CGC does have all the data from the GDC, it doesn’t have all the files from the GDC. This is because we’ve stored the analyzed data (“Level 3”) in BigQuery tables rather than as files. In fact, the only files stored at ISB-CGC are the raw, “Level 1” files. So unless you plan on re-analyzing data from scratch, you can dive straight into BigQuery.
  • GDC file manifests can be directly imported into BigQuery for use in ISB-CGC.
  • GDC case manifests aren’t directly importable into ISB-CGC. A bit of manipulation needs to happen to make them useful in ISB-CGC.

Output from GDC

For the purpose of bringing GDC information into ISB-CGC, GDC has two different outputs to consider once users have finished doing their selections, the file manifest and the case table export. In the example shown below, various filters were set to produce a cohort of 83 cases from the three TCGA kidney cancers and that cohort has 1,790 files on hand at the GDC. To download a File Manifest, which we’ll use later to find the files in ISB-CGC, you need to click on the View Files in Repository button:

../../_images/GDCSetCreation4.png

Once on the file page, a file manifest can be downloaded simply by clicking on the Download Manifest button. A list of Cases can be created by clicking on the Cases tab and then clicking on either the JSON or TSV button on the uppper right of the table (This can also be done from the previous screen). Later in this tutorial, we’ll use the JSON file to bring the cases into Big Query:

../../_images/FileManifestButton4.png
Have feedback or corrections? Please email us at feedback@isb-cgc.org.