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Ref Type Journal Article
PMID (23361621)
Authors Naing A, Cohen R, Dy GK, Hong DS, Dyster L, Hangauer DG, Kwan R, Fetterly G, Kurzrock R, Adjei AA
Title A phase I trial of KX2-391, a novel non-ATP competitive substrate-pocket- directed SRC inhibitor, in patients with advanced malignancies.
Journal Investigational new drugs
Vol 31
Issue 4
Date 2013 Aug
Abstract Text Src kinase is central to tumor cell proliferation, apoptosis, and metastasis. KX2-391 is a synthetic, orally bioavailable small molecule inhibitor of Src tyrosine kinase (TK) signaling and tubulin polymerization. This compound is distinct from other Src kinase inhibitors by targeting the peptide substrate rather than the ATP binding site; the binding site on hetero-dimeric tubulin is novel and distinct from the taxanes and other known tubulin inhibitors.This multicenter Phase I trial utilized a 4 + 2 study design to determine the maximum tolerated dose (MTD), safety, and pharmacokinetics (PK) of KX2-391 in patients with refractory solid tumors.Forty-four (44) patients (18 M, 26 F; median age, 59) were enrolled in 9 dose cohorts. Dose-limiting toxicities, all reversible within 7 days, occurred in 7 patients and consisted of elevated AST (n = 4), ALT (n = 2), neutropenia (n = 1), thrombocytopenia (n = 1), failure to thrive (n = 1) and anorexia (n = 1). The MTD is 40 mg BID continuously. Eleven patients had stable disease for ≥ 4 months, including patients with ovarian, carcinoid, papillary thyroid, prostate, pancreas and head and neck cancer. Patients with prostate and pancreatic cancer also had significant biomarker decreases (PSA, 205 ng/mL to 39 ng/mL; CA19-9, 38,838 U/mL to 267 U/mL). The ovarian cancer patient has had stable disease > 12 months. KX2-391 was orally available, rapidly absorbed, and exposure was proportional to dose across the range investigated.KX2-391 has a favorable pharmacokinetic profile, is well tolerated, demonstrates preliminary evidence of biologic activity, and warrants further evaluation in Phase II trials.


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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
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 KX2-391 Phase I Actionable In a Phase I trial, KX2-391 demonstrated safety and preliminary efficacy, resulted in stable disease for more than 4 months in 25% (11/44) of patients with advanced solid tumors (PMID: 23361621). 23361621