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Ref Type Journal Article
PMID (29674508)
Authors Eroglu Z, Chen YA, Gibney GT, Weber JS, Kudchadkar RR, Khushalani NI, Markowitz J, Brohl AS, Tetteh LF, Ramadan H, Arnone G, Li J, Zhao X, Sharma R, Darville LNF, Fang B, Smalley I, Messina JL, Koomen JM, Sondak VK, Smalley KSM
Title Combined BRAF and HSP90 Inhibition in Patients with Unresectable BRAFV600E-Mutant Melanoma.
Journal Clinical cancer research : an official journal of the American Association for Cancer Research
Vol 24
Issue 22
Date 2018 Nov 15
Abstract Text Purpose: BRAF inhibitors are clinically active in patients with advanced BRAFV600-mutant melanoma, although acquired resistance remains common. Preclinical studies demonstrated that resistance could be overcome using concurrent treatment with the HSP90 inhibitor XL888.Patients and Methods: Vemurafenib (960 mg p.o. b.i.d.) combined with escalating doses of XL888 (30, 45, 90, or 135 mg p.o. twice weekly) was investigated in 21 patients with advanced BRAFV600-mutant melanoma. Primary endpoints were safety and determination of a maximum tolerated dose. Correlative proteomic studies were performed to confirm HSP inhibitor activity.Results: Objective responses were observed in 15 of 20 evaluable patients [75%; 95% confidence interval (CI), 51%-91%], with 3 complete and 12 partial responses. Median progression-free survival and overall survival were 9.2 months (95% CI, 3.8-not reached) and 34.6 months (6.2-not reached), respectively. The most common grade 3/4 toxicities were skin toxicities, such as rash (n = 4, 19%) and cutaneous squamous cell carcinomas (n = 3, 14%), along with diarrhea (n = 3, 14%). Pharmacodynamic analysis of patients' peripheral blood mononuclear cells (PBMC) showed increased day 8 HSP70 expression compared with baseline in the three cohorts with XL888 doses ≥45 mg. Diverse effects of vemurafenib-XL888 upon intratumoral HSP client protein expression were noted, with the expression of multiple proteins (including ERBB3 and BAD) modulated on therapy.Conclusions: XL888 in combination with vemurafenib has clinical activity in patients with advanced BRAFV600-mutant melanoma, with a tolerable side-effect profile. HSP90 inhibitors warrant further evaluation in combination with current standard-of-care BRAF plus MEK inhibitors in BRAFV600-mutant melanoma. Clin Cancer Res; 24(22); 5516-24. ©2018 AACRSee related commentary by Sullivan, p. 5496.


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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
XL888 XL888 1 0
Drug Name Trade Name Synonyms Drug Classes Drug Description
XL888 XL-888 HSP90 Inhibitor 35 XL888 inhibits HSP90, resulting in degradation of HSP90 client proteins, and potentially leading to decreased tumor growth (PMID: 23538902, PMID: 22877636, PMID: 29674508).
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
BRAF V600E/K melanoma predicted - sensitive Vemurafenib + XL888 Phase I Actionable In a Phase I trial, combined Zelboraf (vemurafenib) and XL888 treatment in patients with unresectable, BRAF inhibitor naive, metastatic melanoma harboring BRAF V600E (n=20) or V600K (n=1) resulted in complete and partial responses in 15% (3/20) and 60% (12/20) of evaluable patients, respectively, a 9.2-month median progression free survival, and a 34.6-month overall survival (PMID: 29674508). 29674508