Molecular patterns of response and treatment failure after frontline venetoclax combinations in older patients with AML

Blood - Tập 135 Số 11 - Trang 791-803 - 2020
Courtney D. DiNardo1, Ing Soo Tiong2,3, Anna Quaglieri4,5, Sarah MacRaild3, Sanam Loghavi6, Fiona C. Brown2, Rachel Thijssen4,5, Giovanna Pomilio2, Adam Ivey3, Jessica M. Salmon2, Christina Glytsou7, Shaun Fleming2,3, Q. Zhang1, Huaxian Ma1, Keyur P. Patel1, Steven M. Kornblau1, Zhen Xu4,5, Chong Chyn Chua2,3, Xufeng Chen7, Piers Blombery8,9,10, Christoffer Flensburg4,5, Nik Cummings3, Iannis Aifantis7, Hagop M. Kantarjian1, David C.S. Huang4,5, Andrew W. Roberts8,4,5, Ian J. Majewski4,5, Marina Konopleva1, Andrew H. Wei2,3
1Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX
2Australian Centre for Blood Diseases, Monash University, Melbourne, VIC, Australia
3Department of Haematology, The Alfred Hospital, Melbourne, VIC, Australia
4Department of Medical Biology and
5Walter and Eliza Hall Institute of Medical Research, Melbourne, VIC, Australia
6Department of Hematopathology, The University of Texas MD Anderson Cancer Center, Houston, TX
7Department of Pathology and Perlmutter Cancer Center, NYU School of Medicine, New York, NY;
8Department of Haematology, The Royal Melbourne Hospital, Melbourne, VIC, Australia
9Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Melbourne, Vic, Australia
10Peter MacCallum Cancer Centre, Melbourne, VIC, Australia; and

Tóm tắt

Abstract The BCL-2 inhibitor venetoclax combined with hypomethylating agents or low-dose cytarabine represents an important new therapy for older or unfit patients with acute myeloid leukemia (AML). We analyzed 81 patients receiving these venetoclax-based combinations to identify molecular correlates of durable remission, response followed by relapse (adaptive resistance), or refractory disease (primary resistance). High response rates and durable remissions were typically associated with NPM1 or IDH2 mutations, with prolonged molecular remissions prevalent for NPM1 mutations. Primary and adaptive resistance to venetoclax-based combinations was most commonly characterized by acquisition or enrichment of clones activating signaling pathways such as FLT3 or RAS or biallelically perturbing TP53. Single-cell studies highlighted the polyclonal nature of intratumoral resistance mechanisms in some cases. Among cases that were primary refractory, we identified heterogeneous and sometimes divergent interval changes in leukemic clones within a single cycle of therapy, highlighting the dynamic and rapid occurrence of therapeutic selection in AML. In functional studies, FLT3 internal tandem duplication gain or TP53 loss conferred cross-resistance to both venetoclax and cytotoxic-based therapies. Collectively, we highlight molecular determinants of outcome with clinical relevance to patients with AML receiving venetoclax-based combination therapies.

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