Reference Detail

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	Vol	Issue	Date	Pages	Journal Short Title
Clinical cancer research : an official journal of the American Association for Cancer Research	24	22	2018 Nov 15	5516-5524	Clin Cancer Res

URL

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