
| 10.18632/oncotarget.13811
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Oncotarget 2017 ; 8 (2): 2949-59 Nephropedia Template TP
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Refractory testicular germ cell tumors are highly sensitive to the second generation DNA methylation inhibitor guadecitabine #MMPMID27936464Albany C; Hever-Jardine MP; von Herrmann KM; Yim CY; Tam J; Warzecha JM; Shin L; Bock SE; Curran BS; Chaudhry AS; Kim F; Sandusky GE; Taverna P; Freemantle SJ; Christensen BC; Einhorn LH; Spinella MJOncotarget 2017[Jan]; 8 (2): 2949-59 PMID27936464show ga
Testicular germ cell tumors (TGCTs) are the most common cancers of young males. A substantial portion of TGCT patients are refractory to cisplatin. There are no effective therapies for these patients, many of whom die from progressive disease. Embryonal carcinoma (EC) are the stem cells of TGCTs. In prior in vitro studies we found that EC cells were highly sensitive to the DNA methyltransferase inhibitor, 5-aza deoxycytidine (5-aza). Here, as an initial step in bringing demethylation therapy to the clinic for TGCT patients, we evaluated the effects of the clinically optimized, second generation demethylating agent guadecitabine (SGI-110) on EC cells in an animal model of cisplatin refractory testicular cancer. EC cells were exquisitely sensitive to guadecitabine and the hypersensitivity was dependent on high levels of DNA methyltransferase 3B. Guadecitabine mediated transcriptional reprogramming of EC cells included induction of p53 targets and repression of pluripotency genes. As a single agent, guadecitabine completely abolished progression and induced complete regression of cisplatin resistant EC xenografts even at doses well below those required to impact somatic solid tumors. Low dose guadecitabine also sensitized refractory EC cells to cisplatin in vivo. Genome-wide analysis indicated that in vivo antitumor activity was associated with activation of p53 and immune-related pathways and the antitumor effects of guadecitabine were dependent on p53, a gene rarely mutated in TGCTs. These preclinical findings suggest that guadecitabine alone or in combination with cisplatin is a promising strategy to treat refractory TGCT patients.�
  
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