Urothelial Cancers with Small Cell Variant Histology Have Confirmed High Tumor Mutational Burden, Frequent TP53 and RB Mutations, and a Unique Gene Expression Profile

Jean Hoffman‐Censits, Woonyoung Choi, Sumanta K. Pal, Edouard J. Trabulsi, William Kevin Kelly, Noah M. Hahn, David J. McConkey, Éva Compérat, Andrés Matoso, Olivier Cussenot, Géraldine Cancel‐Tassin, Megan Fong, Jeffrey S. Ross, Russell W. Madison, Siraj M. Ali