AML Subtype Is a Major Determinant of the Association between Prognostic Gene Expression Signatures and Their Clinical Significance

Abstract

Summary: Relapse in acute myeloid leukemia (AML) may result from variable genetic origins or convergence on common biological processes. Exploiting the specificity and sensitivity of regulatory DNA, we analyze patient samples of multiple clinical outcomes covering various AML molecular subtypes. We uncover regulatory variation among patients translating into a transcriptional signature that predicts relapse risk. In addition, we find clusters of coexpressed genes within this signature selectively link to relapse risk in distinct patient subgroups defined by molecular subtype or AML maturation. Analyzing these gene clusters and the AML subtypes separately enhances their prognostic value substantially and provides insight in the mechanisms underlying relapse risk across the distinct patient subgroups. We propose that prognostic gene expression signatures in AML are valid only within patient subgroups and do not transcend these subgroups. : Predicting relapse risk using prognostic gene expression signatures can help direct therapeutic strategies in the management of malignancies. Wiggers et al. demonstrate that a prognostic signature that predicts relapse risk across AML patients contains subsets of genes that are valid within defined patient subgroups only and do not transcend subgroups. Keywords: acute myeloid leukemia, gene regulation, gene regulatory elements, relapse, subtype heterogeneity