From literature I know that a few TCGA samples have also information about treatment. It isn't clear to me how to obtain that information. After downloading the clinical data sets with TCGAbiolinks package I see one column "treatment_id". Each TCGA sample has a code in this column, looking like this: dbf26982-97b4-59f7-b165-d3889623bc21.

I can't figure out what that means, or how I can translate the code into drug name.
Any ideas?
Or is there an other way, how to obtain the treatment information outside the "clinical data information"?
The treatment/drug information can be downloaded using the TCGAbiolinks package. 
Here is the command from the [vignette](https://bioconductor.org/packages/devel/bioc/vignettes/TCGAbiolinks/inst/doc/clinical.html#parse_xml_clinical_data):

    query <- GDCquery(project = "TCGA-COAD", 
                  data.category = "Clinical", 
                  file.type = "xml", 
                  barcode = c("TCGA-RU-A8FL","TCGA-AA-3972"))
    GDCdownload(query)
    clinical <- GDCprepare_clinic(query, clinical.info = "drug")

You can extract other kinds of clinical data such as "radiation" therapy using the same command. Just set `clinical.info` argument with `radiation`. 
