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Ref Type Journal Article
PMID (25715763)
Authors Oh DY, Lee SH, Han SW, Kim MJ, Kim TM, Kim TY, Heo DS, Yuasa M, Yanagihara Y, Bang YJ
Title Phase I Study of OPB-31121, an Oral STAT3 Inhibitor, in Patients with Advanced Solid Tumors.
Journal Cancer research and treatment : official journal of Korean Cancer Association
Vol 47
Issue 4
Date 2015 Oct
Abstract Text OPB-31121 is an oral STAT3 inhibitor with a good preclinical antitumor activity. This phase I dose-escalation study of OPB-31121 was conducted to determine maximum-tolerated dose (MTD), safety, pharmacokinetics, and preliminary antitumor efficacy in patients with advanced solid tumors.Patients received OPB-31121 once daily for 28 days of each cycle followed by 2 weeks rest. A standard 3+3 design was used for dose-escalation. Safety and response were evaluated by the National Cancer Institute-Common Terminology Criteria for Adverse Events (NCI-CTCAE) ver. 3.0 and Response Evaluation Criteria in Solid Tumor (RECIST) ver. 1.0, respectively.Twenty-five patients were treated with OPB-31121 at five dose levels: 100 mg (n=4), 200 mg (n=3), 400 mg (n=3), 600 mg (n=7), and 800 mg (n=8). Seven patients discontinued treatment during cycle 1 for various reasons other than study drug-related adverse events. Among 18 patients who were evaluable for dose-limiting toxicity (DLT), three DLTs were observed: one DLT (grade 3 vomiting) at 600 mg and two DLTs (grade 3 vomiting, grade 3 diarrhea) at 800 mg. The MTD was determined as 800 mg/day. Common adverse events were gastrointestinal adverse event including nausea (84%), vomiting (80%), and diarrhea (72%). Pharmacokinetics did not demonstrate dose-proportionality of OPB-31121. Eight patients had stable disease and 10 patients had disease progression. Two patients (1 colon cancer, 1 rectal cancer) showed tumor shrinkage. One gastric cancer patient continued treatment up to cycle 13 before disease progression.This study demonstrates feasibility of STAT3 inhibition in patients with advanced solid tumor. OPB-31121, at the MTD of 800 mg/day, was safe and relatively well tolerated, and has a preliminary antitumor activity.


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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
OPB-31121 OPB 31121 STAT3 Inhibitor 21 OPB-31121 is a small molecule inhibitor of Stat3 that demonstrates antitumor activity (PMID: 23402820, PMID: 25715763, PMID: 25676869, PMID: 24819685).
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
Unknown unknown Advanced Solid Tumor not applicable OPB-31121 Phase I Actionable In a Phase I trial, OPB-31121 treatment resulted in stable diseases in 44% (8/18) of patients with advanced solid tumors, and tumor shrinkage in 2 patients (1 colon cancer, 1 rectal cancer) (PMID: 25715763). 25715763