The following study hypothesized that a gene expression diagnostic possibly indicates whether cancer stem cells are present in a patient's cancer and predict a poor prognosis: “Microarray analysis identifies a death-from-cancer signature predicting therapy failure in patients with multiple types of cancer” (emphasis on prostate cancer): http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=15931389&query_hl=1
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