WT1 mutations are present in ~7% of de novo AML, are typically Lof mutation involving exons 7-9 of the gene. They frequently (~15%) co-occur w/ NPM1mut & have detrimental impact in this setting, shown by @AkEisfeld and colleagues in bit.ly/3eWQtXw@LeukemiaJnl
We studies a cohort of de novo NPM1-mut AML. 7% had concurrent WT1 mutations at baseline. 22% (15/67) relapsed; 4 (27%) with newly acquired Lof WT1-mut. Illustrated by @furudateken
Most interestingly 3/4 were post allo-HSCT (2 w/ matched related; 1 matched unrelated donors). WT1 mutations were both clonal and subclonal. Illustrated by @furudateken
The exact role of WT1-mut in leukemogenesis is unknown. We know WT1-mut are typically mutually exclusive with TET2-mut, suggesting overlapping function.
This was shown in the TCGA cohort and ECOG E1900 cohort by @RossLevineLabbit.ly/3t7AU7A@NEJM
Wild type WT1 protein overexpression is seen in in >70 % of AML, and is believed to have immunogenic effects, shown previously by @lab_rezvani and colleagues bit.ly/3HJC25n@BloodJournal
Wild type WT1 maintains early HCS progenitor cells in a quiescent state while promoting differentiation of more mature lineage-committed progenitor cells, its postnatal expression is limited to gonads, podocytes of kidney and mesothelial cells. Illustrated by @SibaElHussein
LoF WT1 mutations are thought to interfere with this immunogenicity, and escape from host immune system. haematologica.org/article/view/8…
Our findings suggest that emerging WT1 mutations may serve as a conduit for relapse in NPM1-mut AML, particularly post-HSCT, & that evaluation for emergent WT1 mutations, particularly at relapse has value in the surveillance of patients with NPM1 mutated AML. #bmtsm#leusm
A lot remains unknown re the role WT1-mut in AML and we are excited to dive deeper and learn more, so stay tuned.
Major gratitude to all our co-authors, especially @SibaElHussein@furudateken , @DrKTakahashi , @SaWangMD , and the Twiterless but incredible Courtney DiNardo!
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The story of 1 day in the life of a #hematopathologist… I’m too exhausted to make a fancy educational thread but here are some amazing 🔬 pics for your viewing pleasure. I diagnosed all cases in one day 🤯 only at @MDAndersonNews Happy almost weekend people 🥂 #hemepath 🧵 1/n
Myeloproliferative neoplasm w/ concurrent BCR::ABL1 and JAK2 V617F ..the megekaryocyte morphology is clue to something beyond CML #mpnsm#PathOutPic 2/
BPDCN with perfect so-called “hand mirror” (red) and “pearl necklace” (black) morphology #BPDCN#PathOutPic 3/