TRIM28 congenital predisposition to Wilms Tumor: Novel mutations and presentation in a sibling pair

Colin E Moore, Hector Monforte, Jamie K Teer, Yonghong Zhang, Sean Yoder, Andrew S Brohl, Damon Reed
Cold Spring Harbor Molecular Case Studies 2020 July 22
Wilms tumor is the most common renal malignancy in children. In addition to staging, molecular risk stratification is being increasingly employed such as LOH in chromosomes 1 and 16. While genetic predisposition syndromes have been well characterized in some Wilms tumors, recent sequencing and biology efforts are expanding the classification of this malignancy. Here we present a case of siblings with remarkably similar presentations of bilateral Wilms tumor near 12 months of age. Thorough exam after the younger sibling was diagnosed did not reveal any signs to suggest one of the known Wilms predisposition syndromes. Both were treated with standard therapies with good response and long term sustained complete remission of 53 and 97 months respectively. Whole exome sequencing was performed on a tumor sample from each patient and matched blood from one revealing a shared truncation mutation of TRIM28 in all three samples with heterozygosity in the germline sample. TRIM28 loss has been recently implicated in early stage Wilms tumors with epithelioid morphology. These siblings expand the phenotype for presentation with multifocal disease with retained excellent response to standard therapy.

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