美国杰克逊实验室Roel G. W. Verhaak等研究人员合作发现，染色体外DNA与癌基因扩增和多种癌症预后差有关。2020年8月17日，《自然—遗传学》杂志在线发表了这一成果。
Title: Extrachromosomal DNA is associated with oncogene amplification and poor outcome across multiple cancers
Author: Hoon Kim, Nam-Phuong Nguyen, Kristen Turner, Sihan Wu, Amit D. Gujar, Jens Luebeck, Jihe Liu, Viraj Deshpande, Utkrisht Rajkumar, Sandeep Namburi, Samirkumar B. Amin, Eunhee Yi, Francesca Menghi, Johannes H. Schulte, Anton G. Henssen, Howard Y. Chang, Christine R. Beck, Paul S. Mischel, Vineet Bafna, Roel G. W. Verhaak
Abstract: Extrachromosomal DNA (ecDNA) amplification promotes intratumoral genetic heterogeneity and accelerated tumor evolution1,2,3; however, its frequency and clinical impact are unclear. Using computational analysis of whole-genome sequencing data from 3,212 cancer patients, we show that ecDNA amplification frequently occurs in most cancer types but not in blood or normal tissue. Oncogenes were highly enriched on amplified ecDNA, and the most common recurrent oncogene amplifications arose on ecDNA. EcDNA amplifications resulted in higher levels of oncogene transcription compared to copy number-matched linear DNA, coupled with enhanced chromatin accessibility, and more frequently resulted in transcript fusions. Patients whose cancers carried ecDNA had significantly shorter survival, even when controlled for tissue type, than patients whose cancers were not driven by ecDNA-based oncogene amplification. The results presented here demonstrate that ecDNA-based oncogene amplification is common in cancer, is different from chromosomal amplification and drives poor outcome for patients across many cancer types.