R包的下载
## try http:// if https:// URLs are not supported
source("https://bioc.ism.ac.jp/biocLite.R")
biocLite("TCGAbiolinks")
涉及的包很多，可能很久才能下载完，下载建议使用R，不要用Rstudio，效果更好。
可下载的数据
一个案例
query <- GDCquery(project = "TCGA-ACC",data.category = "Copy Number Variation",data.type = "Copy Number Segment")
GDCdownload(query)
query.met <- GDCquery(project = "TCGA-GBM",legacy = TRUE,data.category = "DNA methylation",platform = "Illumina Human Methylation 450")
GDCdownload(query)
具体的情况，请多做实验来验证。