Q (sonnet): How many glioblastoma studies are in cBioPortal?

▶ list_studies
{
 "search": "glioblastoma",
 "limit": 100
}

◀ result
{"result":[{"cancer_study_identifier":"gbm_tcga","name":"Glioblastoma Multiforme (TCGA, Firehose Legacy)","type_of_cancer_id":"difg","sample_count":619,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_tcga"},{"cancer_study_identifier":"gbm_tcga_gdc","name":"Glioblastoma Multiforme (TCGA GDC, 2025)","type_of_cancer_id":"difg","sample_count":611,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_tcga_gdc"},{"cancer_study_identifier":"gbm_tcga_pan_can_atlas_2018","name":"Glioblastoma Multiforme (TCGA, PanCancer Atlas)","type_of_cancer_id":"difg","sample_count":592,"has_guide":true,"url":"https://www.cbioportal.org/study/summary?id=gbm_tcga_pan_can_atlas_2018"},{"cancer_study_identifier":"gbm_tcga_pub2013","name":"Glioblastoma (TCGA, Cell 2013)","type_of_cancer_id":"difg","sample_count":577,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_tcga_pub2013"},{"cancer_study_identifier":"gbm_tcga_pub","name":"Glioblastoma (TCGA, Nature 2008)","type_of_cancer_id":"difg","sample_count":206,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_tcga_pub"},{"cancer_study_identifier":"gbm_cptac_2021","name":"Glioblastoma (CPTAC, Cell 2021)","type_of_cancer_id":"difg","sample_count":99,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_cptac_2021"},{"cancer_study_identifier":"gbm_columbia_2019","name":"Glioblastoma (Columbia, Nat Med. 2019)","type_of_cancer_id":"difg","sample_count":42,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_columbia_2019"},{"cancer_study_identifier":"gbm_iatlas_prins_2019","name":"Glioblastoma (Randomized Clinical Trial, Nat Med. 2019) - iAtlas Harmonized","type_of_cancer_id":"adifg","sample_count":30,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_iatlas_prins_2019"}]}

═ answer (success)
There are **8 glioblastoma studies** in cBioPortal (this search may not capture every possible naming variant, but these are the studies with "glioblastoma" in their name/description):

| Study | Sample Count |
|---|---|
| [Glioblastoma Multiforme (TCGA, Firehose Legacy)](https://www.cbioportal.org/study/summary?id=gbm_tcga) | 619 |
| [Glioblastoma Multiforme (TCGA GDC, 2025)](https://www.cbioportal.org/study/summary?id=gbm_tcga_gdc) | 611 |
| [Glioblastoma Multiforme (TCGA, PanCancer Atlas)](https://www.cbioportal.org/study/summary?id=gbm_tcga_pan_can_atlas_2018) | 592 |
| [Glioblastoma (TCGA, Cell 2013)](https://www.cbioportal.org/study/summary?id=gbm_tcga_pub2013) | 577 |
| [Glioblastoma (TCGA, Nature 2008)](https://www.cbioportal.org/study/summary?id=gbm_tcga_pub) | 206 |
| [Glioblastoma (CPTAC, Cell 2021)](https://www.cbioportal.org/study/summary?id=gbm_cptac_2021) | 99 |
| [Glioblastoma (Columbia, Nat Med. 2019)](https://www.cbioportal.org/study/summary?id=gbm_columbia_2019) | 42 |
| [Glioblastoma (Randomized Clinical Trial, Nat Med. 2019) - iAtlas Harmonized](https://www.cbioportal.org/study/summary?id=gbm_iatlas_prins_2019) | 30 |

Several of these are different releases/analyses of the same underlying TCGA cohort (Firehose Legacy, GDC 2025, PanCancer Atlas, and Cell 2013/Nature 2008 are all TCGA GBM, just processed differently). If you want a single non-overlapping cohort for analysis, the **PanCancer Atlas** version is generally recommended as the current standard TCGA release.