The GMQL query in the Code snippet 1 loads the studies from GWAS Catalog mapped to the trait ‘breast carcinoma’ (line 2) and the data referred to genes BRCA1 and BRCA2 from the GRCh38_TCGA_gene_expression dataset (line 4), which are merged within a single sample grouping all the regions from the TCGA samples (line 6). This evidence concerns the gene BRCA2 and breast carcinoma.