BRCA2 and bladder transitional cell carcinoma: Black circles in the ATLAS dataset highlight samples with deleterious alterations in DDR pathway genes BRCA1, BRCA2, PALB2, or RAD51C. DDR DNA damage response; IQR interquartile range; LOH loss of heterozygosity; TCGA-BLCA The Cancer Genome Atlas Urothelial Bladder Carcinoma