Next generation sequencing of prostate cancer from a patient identifies a deficiency of methylthioadenosine phosphorylase, an exploitable tumor target

Colin C. Collins, Stanislav V. Volik, Anna V. Lapuk, Yuwei Wang, Peter W. Gout, Chunxiao Wu, Hui Xue, Hongwei Cheng, Anne Haegert, Robert H. Bell, Sonal Brahmbhatt, Shawn Anderson, Ladan Fazli, Antonio Hurtado-Coll, Mark A. Rubin, Francesca Demichelis, Himisha Beltran, Martin Hirst, Marco Marra, Christopher MaherArul M. Chinnaiyan, Martin Gleave, Joseph R. Bertino, Martin Lubin, Yuzhuo Wang

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Castrate-resistant prostate cancer (CRPC) and neuroendocrine carcinoma of the prostate are invariably fatal diseases for which only palliative therapies exist. As part of a prostate tumor sequencing program, a patient tumor was analyzed using Illumina genome sequencing and a matched renal capsule tumor xenograft was generated. Both tumor and xenograft had a homozygous 9p21 deletion spanning the MTAP, CDKN2, and ARF genes. It is rare for this deletion to occur in primary prostate tumors, yet approximately 10% express decreased levels of methylthioadenosine phosphorylase (MTAP) mRNA. Decreased MTAP expression is a prognosticator for poor outcome. Moreover, it seems that this deletion is more commoninCRPCthan in primary prostate cancer.Weshow for the first time that treatment with methylthioadenosine and high dose 6-thioguanine causes marked inhibition of a patient-derived neuroendocrine xenograft growth while protecting the host from 6-thioguanine toxicity. This therapeutic approach can be applied to other MTAP-deficient human cancers as deletion or hypermethylation of the MTAP gene occurs in a broad spectrum of tumors at high frequency. The combination of genome sequencing and patient-derived xenografts can identify candidate therapeutic agents and evaluate them for personalized oncology.

Original languageEnglish
Pages (from-to)775-781
Number of pages7
JournalMolecular Cancer Therapeutics
Volume11
Issue number3
DOIs
StatePublished - Mar 2012

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    Collins, C. C., Volik, S. V., Lapuk, A. V., Wang, Y., Gout, P. W., Wu, C., Xue, H., Cheng, H., Haegert, A., Bell, R. H., Brahmbhatt, S., Anderson, S., Fazli, L., Hurtado-Coll, A., Rubin, M. A., Demichelis, F., Beltran, H., Hirst, M., Marra, M., ... Wang, Y. (2012). Next generation sequencing of prostate cancer from a patient identifies a deficiency of methylthioadenosine phosphorylase, an exploitable tumor target. Molecular Cancer Therapeutics, 11(3), 775-781. https://doi.org/10.1158/1535-7163.MCT-11-0826