Reference Detail

Ref Type

Journal Article

PMID

(24231268)

Authors

Henssen A, Thor T, Odersky A, Heukamp L, El-Hindy N, Beckers A, Speleman F, Althoff K, Schafers S, Schramm A, Sure U, Fleischhack G, Eggert A, Schulte JH

Title

BET bromodomain protein inhibition is a therapeutic option for medulloblastoma.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Oncotarget	4	11	2013 Nov	2080-95	Oncotarget

URL

Abstract Text

Medulloblastoma is the most common malignant brain tumor of childhood, and represents a significant clinical challenge in pediatric oncology, since overall survival currently remains under 70%. Patients with tumors overexpressing MYC or harboring a MYC oncogene amplification have an extremely poor prognosis. Pharmacologically inhibiting MYC expression may, thus, have clinical utility given its pathogenetic role in medulloblastoma. Recent studies using the selective small molecule BET inhibitor, JQ1, have identified BET bromodomain proteins, especially BRD4, as epigenetic regulatory factors for MYC and its targets. Targeting MYC expression by BET inhibition resulted in antitumoral effects in various cancers. Our aim here was to evaluate the efficacy of JQ1 against preclinical models for high-risk MYC-driven medulloblastoma. Treatment of medulloblastoma cell lines with JQ1 significantly reduced cell proliferation and preferentially induced apoptosis in cells expressing high levels of MYC. JQ1 treatment of medulloblastoma cell lines downregulated MYC expression and resulted in a transcriptional deregulation of MYC targets, and also significantly altered expression of genes involved in cell cycle progression and p53 signalling. JQ1 treatment prolonged the survival of mice harboring medulloblastoma xenografts and reduced the tumor burden in these mice. Our preclinical data provide evidence to pursue testing BET inhibitors, such as JQ1, as molecular targeted therapeutic options for patients with high-risk medulloblastomas overexpressing MYC or harboring MYC amplifications.

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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
JQ1	JQ1	7	0

Drug Name	Trade Name	Synonyms	Drug Classes	Drug Description
JQ1		JQ-1	BET Inhibitor (Pan) 32	JQ1 is a BET bromodomain inhibitor with greatest specificity towards BRD4, resulting in decreased Myc expression, increased cell death, reduced macrophage immunosuppression, and inhibition of tumor growth (PMID: 24231268, PMID: 31018997, PMID: 30906568, PMID: 32800944).

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
TP53 mutant	medulloblastoma	decreased response	JQ1	Preclinical	Actionable	In a preclinical study, medulloblastoma cell lines with TP53 mutations had significantly less sensitivity to the BET inhibitor, JQ1, than cell lines carrying wild-type TP53 (PMID: 24231268).	24231268
TP53 wild-type	medulloblastoma	sensitive	JQ1	Preclinical	Actionable	In a preclinical study, medulloblastoma cell lines with TP53 mutations had significantly less sensitivity to the BET inhibitor, JQ1, than cell lines carrying wild-type TP53 (PMID: 24231268).	24231268