First-in-human trial of a STAT3 decoy oligonucleotide in head and neck tumors: implications for cancer therapy.

Abstract:

UNLABELLED:Despite evidence implicating transcription factors, including STAT3, in oncogenesis, these proteins have been regarded as "undruggable." We developed a decoy targeting STAT3 and conducted a phase 0 trial. Expression levels of STAT3 target genes were decreased in head and neck cancers following injection with the STAT3 decoy compared with tumors receiving saline control. Decoys have not been amenable to systemic administration due to instability. To overcome this barrier, we linked the oligonucleotide strands using hexaethylene glycol spacers. This cyclic STAT3 decoy bound with high affinity to STAT3 protein, reduced cellular viability, and suppressed STAT3 target gene expression in cancer cells. Intravenous injection of the cyclic STAT3 decoy inhibited xenograft growth and downregulated STAT3 target genes in the tumors. These results provide the first demonstration of a successful strategy to inhibit tumor STAT3 signaling via systemic administration of a selective STAT3 inhibitor, thereby paving the way for broad clinical development. SIGNIFICANCE:This is the fi rst study of a STAT3-selective inhibitor in humans and the fi rst evidence that a transcription factor decoy can be modifi ed to enable systemic delivery. These findings have therapeutic implications beyond STAT3 to other “undruggable” targets in human cancers.

journal_name

Cancer Discov

journal_title

Cancer discovery

authors

Sen M,Thomas SM,Kim S,Yeh JI,Ferris RL,Johnson JT,Duvvuri U,Lee J,Sahu N,Joyce S,Freilino ML,Shi H,Li C,Ly D,Rapireddy S,Etter JP,Li PK,Wang L,Chiosea S,Seethala RR,Gooding WE,Chen X,Kaminski N,Pandit K,Jo

doi

10.1158/2159-8290.CD-12-0191

subject

Has Abstract

pub_date

2012-08-01 00:00:00

pages

694-705

issue

8

eissn

2159-8274

issn

2159-8290

pii

2159-8290.CD-12-0191

journal_volume

2

pub_type

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