Samples.mRNASeq: Retrieve mRNASeq data.
In mariodeng/FirebrowseR: An 'API' Client for Broads 'Firehose' Pipeline

This service returns sample-level log2 mRNASeq expression values. Results may be filtered by gene, cohort, barcode, sample type or characterization protocol, but at least one gene must be supplied.

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Samples.mRNASeq(format = "json", gene = "", cohort = "",
  tcga_participant_barcode = "", sample_type = "", protocol = "RSEM",
  page = "1", page_size = "250", sort_by = "cohort")

`format`	Format of result. Default value is json. While json,tsv,csv are available.
`gene`	Comma separated list of gene name(s). Multiple values are allowed .
`cohort`	Narrow search to one or more TCGA disease cohorts from the scrollable list. Multiple values are allowed ACC,BLCA,BRCA,CESC,CHOL,COAD,COADREAD,DLBC,ESCA,FPPP,GBM,GBMLGG,HNSC,KICH,KIPAN,KIRC,KIRP,LAML,LGG,LIHC,LUAD,LUSC,MESO,OV,PAAD,PCPG,PRAD,READ,SARC,SKCM,STAD,STES,TGCT,THCA,THYM,UCEC,UCS,UVM.
`tcga_participant_barcode`	Comma separated list of TCGA participant barcodes (e.g. TCGA-GF-A4EO). Multiple values are allowed .
`sample_type`	Narrow search to one or more TCGA sample types from the scrollable list. Multiple values are allowed NB,NBC,NBM,NT,TAM,TAP,TB,TM,TP,TR.
`protocol`	Narrow search to one or more sample characterization protocols from the scrollable list. Multiple values are allowed RPKM,RSEM. Default value is RSEM.
`page`	Which page (slice) of entire results set should be returned. Multiple values are allowed . Default value is 1.
`page_size`	Number of records per page of results. Max is 2000. Multiple values are allowed . Default value is 250.
`sort_by`	Which column in the results should be used for sorting paginated results? Default value is cohort. While tcga_participant_barcode,cohort,gene,protocol,sample_type are available.