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No retraction, correction or concern found when last checked on Oct 16, 2026.

Targeting oncogenic Myc as a strategy for cancer treatment

Hui Chen, Hudan Liu, Guoliang Qing

Signal Transduction and Targeted Therapy · 2018 · Review · CC BY

doi:10.1038/s41392-018-0008-7

Abstract

The MYC family oncogene is deregulated in >50% of human cancers, and this deregulation is frequently associated with poor prognosis and unfavorable patient survival. Myc has a central role in almost every aspect of the oncogenic process, orchestrating proliferation, apoptosis, differentiation, and metabolism. Although Myc inhibition would be a powerful approach for the treatment of many types of cancers, direct targeting of Myc has been a challenge for decades owing to its “undruggable” protein structure. Hence, alternatives to Myc blockade have been widely explored to achieve desirable anti-tumor effects, including Myc/Max complex disruption, MYC transcription and/or translation inhibition, and Myc destabilization as well as the synthetic lethality associated with Myc overexpression. In this review, we summarize the latest advances in targeting oncogenic Myc, particularly for cancer therapeutic purposes.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 16, 2026. Paragraph numbers are ours, so an answer can point at one.

Introduction

The MYC oncogene family consists of three members, C-MYC, MYCN, and MYCL, which encode c-Myc, N-Myc, and L-Myc, respectively.– The Myc oncoproteins belong to a family of so-called “super-transcription factors” that potentially regulate the transcription of at least 15% of the entire genome. The major downstream effectors of Myc include those involved in ribosome biogenesis, protein translation, cell-cycle progression and metabolism, orchestrating a broad range of biological functions, such as cell proliferation, differentiation, survival, and immune surveillance (Fig. 1).,

Myc family members exhibit high-structural homology, including the basic-region /helix-loop-helix/leucine-zipper (BR/HLH/LZ) motif at the C terminus and three highly conserved elements, known as Myc boxes 1–3 at the N terminus (Fig. 2a).,, As a master transcription factor, Myc binds to Max through the common BR/HLH/LZ motif, which is required for DNA–protein interactions.,, The Myc/Max heterodimer recruits a chromatin-modifying complex (TRRAP, GCN5, TIP60, and TIP48) and activates transcription by binding to the conserved E-box DNA sequence (CACGTG) located in the transcriptional regulatory region of target genes (Fig. 2b).,, Recent studies have shown that, in addition to recognizing specific E-box sequences, c-Myc also accumulates in the promoter regions of active genes, leading to transcriptional amplification (Fig. 2c).,

The expression of Myc family members is tightly controlled under normal circumstances., Yet, Myc is frequently deregulated in human cancers. Excess Myc expression can be induced upon retroviral promoter insertion, chromosomal translocation/amplification, activation of super-enhancers within the MYC gene, and/or mutation of upstream signaling pathways that enhance Myc stability. Studies in transgenic mouse models have demonstrated that even transient inactivation of Myc elicits tumor regression, suggesting that regulation of oncogenic Myc could be harnessed to treat cancer patients.– Yet, drug development aimed at directly targeting Myc has proved challenging. First, as a transcription factor, Myc lacks a specific active site for small molecules, making it difficult to functionally inhibit its activities using strategies similar to those used for kinases. Second, Myc is predominantly located in the nucleus, thus, targeting nuclear Myc with specific monoclonal antibodies is technically impractical. To overcome these obstacles, alternative approaches to indirectly abrogate Myc oncogenic functions have been extensively investigated.

Indirect targeting of Myc

Because strategies to directly target Myc have not been achieved thus far, essential targets involved in Myc deregulation have been exploited as new approaches to treat Myc-driven cancers. Targeting MYC transcription by interfering with chromatin-dependent signal transduction to RNA polymerase, a process in which BRD4 has been implicated, has shown great promise., Myc stability is tightly controlled by the ubiquitin-proteasome system, thus, a potential strategy to target Myc is to selectively inhibit the kinases and/or deubiquitinases that stabilize Myc., Myc strictly depends on its partner Max to regulate gene transcription, so interrupting the Myc–Max complex is therefore an additional approach to inhibit Myc signaling. Here, we provide a concise overview of the key factors involved in the transcription, translation, stability, and activation of Myc, which could be targeted for the treatment of Myc-addicted cancers (Fig. 3).

Bromodomain-containing 4 (BRD4)

BRD4 is a member of the mammalian bromodomain and extraterminal (BET) family. BRD4 regulates transcription through recruitment of the positive transcription elongation factor b (P-TEFb), which phosphorylates the carboxy-terminal domain of RNA polymerase II (pol II), to the site of hyperacetylated chromatin. These changes lead to the release of RNA pol II from pausing in the promoter-proximal region, ultimately resulting in transcriptional elongation., MYC transcription is under BRD4 regulation. JQ1, a powerful inhibitor of BRD4, competes with BRD4 for binding to acetylated lysines and displaces BRD4 from the super-enhancers within the MYC oncogene., As such, inhibition of the BET bromodomain with JQ1 showed potent anti-cancer effects both in vitro and in vivo in multiple hematopoietic cancers and pancreatic ductal adenocarcinoma (PDAC) exhibiting C-MYC overexpression.– Neuroblastomas and other MYCN-driven cancers are also sensitive to BET inhibitors. GSK525762, a specific BET inhibitor, is currently in early-phase clinical trials for treating these hematopoietic malignancies and solid tumors (ClinicalTrials.gov: NCT01943851, NCT03266159).

Cyclin-dependent kinase 7 and 9 (CDK7 and CDK9)

In contrast to the classical cell-cycle CDKs which are largely responsible for cell-cycle transition, CDK7 and CDK9 are CDKs that have critical roles in transcription initiation and elongation., CDK7 is a catalytic subunit of the transcription factor IIH complex (TFIIH), and CDK9 is a kinase subunit of P-TEFb., These two transcriptional kinases phosphorylate specific serine residues within the carboxy-terminal domain of Pol II, facilitating efficient transcriptional initiation, pause release and elongation. Numerous studies demonstrate that inhibition of transcriptional CDKs primarily affects the accumulation of transcripts critical for the control of cell identity, growth, and proliferation.–

A general feature of MYC deregulation is its transcriptional regulation by Super-Enhancers (SEs), clusters of enhancers that are densely occupied by transcription factors and chromatin regulators, including CDK7 and CDK9, rendering this group of kinases ideal candidates for blocking Myc-dependent transcriptional amplification., Indeed, inhibition of CDK7 and/or CDK9 substantially reduces MYC expression, attendant to widespread transcriptional downregulation of Myc target genes.,, Administration of specific inhibitors against CDK7 (THZ1) and/or CDK9 (PC585) induced potent anti-tumor effects in MYC-overexpressing T-cell acute lymphoblastic leukemia, mixed-lineage leukemia, neuroblastomas, and small cell lung cancers, validating these newly developed transcriptional CDK inhibitors as a potential treatment strategy that targets global transcriptional amplification in Myc-driven cancers.,,

Mammalian target of rapamycin (mTOR)

The phosphatidylinositol 3-kinase (PI3K)/AKT/mTOR pathway is frequently altered in various cancers. mTOR is a serine/threonine kinase that functions as the catalytic subunit of two distinct complexes called mTOR complexes 1 and 2 (mTORC1 and mTORC2). The central role of mTOR in protein synthesis is largely attributed to mTORC1., mTORC1-dependent phosphorylation of eukaryotic translation initiation factor 4E (eIF4E) binding protein 1 (4EBP1) blocks its ability to negatively regulate the translation initiation factor eIF4E, thus promoting the translation of mRNAs containing long 5′-untranslated regions (5′-UTRs) with complex RNA secondary structures, such as MYC., As such, pharmacological inhibition of the PI3K/AKT/mTOR pathway markedly decreased Myc level and exhibited remarkable therapeutic efficacy in Myc-driven cancers, including neuroblastoma, small-cell lung carcinoma, breast cancer, and multiple hematopoietic cancers., –

Cytoplasmic polyadenylation element-binding protein (CPEB)

The CPEB-family proteins are sequence-specific RNA-binding proteins which control the elongation of the poly(A) tail and polyadenylation-induced translation. CPEB binds the cytoplasmic polyadenylation element (CPE) containing the conserved UUUUAU or UUUUAAU sequence within the 3′-UTRs of responding mRNAs. A recent study revealed that the C-MYC mRNA contains CPEs that can be recognized by CPEB. Mechanistically, CPEB recruits Caf1 deadenylase through an interaction with Tob, an antiproliferative protein, and inhibits c-Myc expression by accelerating the deadenylation and decay of its mRNA. Expression of CPEB-family proteins are frequently downregulated in human cancers. Therefore, pharmacological approaches aimed at reactivating CPEB expression would lead to Myc inhibition in Myc-driven cancers.

USP28, USP36, and USP7

Myc stability is tightly controlled by the ubiquitin-proteasome system. Upon phosphorylation at Thr58, Myc is polyubiquitinated by the E3 ligase FBW7 and degraded by the proteasome. The human FBW7 locus encodes three protein isoforms, FBW7α, FBW7β, and FBW7ɣ, that differ in their N-terminal sequences and in their subcellular localization. Both FBW7α and FBW7ɣ are responsible for the selective degradation of endogenous Myc in human cells. Several deubiquitinating enzymes are involved in Myc stabilization. USP28 was shown to bind c-Myc through an interaction with FBW7α and antagonize its E3 ligase activities in the nucleus, leading to Myc stabilization and tumor cell proliferation. USP36 deubiquitinates and stabilizes c-Myc through interactions with FBW7ɣ in the nucleolus. USP7 directly binds to and stabilizes N-Myc through deubiquitination in neuroblastomas cells, and a small-molecule inhibitor of USP7, P22077, markedly suppressed growth of MYCN-amplified neuroblastoma in a xenograft model. In principle, targeting these deubiquitinases could cause Myc destabilization and tumor suppression.

AURKA

The Aurora family includes AURKA, AURKB, and AURKC, which are key regulators of mitosis. AURKA contributes to tumorigenesis through interactions with P53 and Myc.– Recently, Otto et al. showed that Aurora A and N-Myc acted as oncogenic partners in neuroblastomas. AURKA forms a complex with N-Myc, which protects N-Myc from FBW7-mediated proteasomal degradation. Two AURKA inhibitors, MLN8054 and MLN8237, disrupt the Myc–AURKA complex, resulting in N-Myc degradation and tumor regression in MYCN-amplified neuroblastomas., MLN8237 also induced c-Myc degradation in P53-mutant human hepatocellular carcinoma cells. These data suggest that AURKA inhibitors may be potential therapeutics for the treatment of Myc-dependent cancers.

Polo-like kinase 1 (PLK1)

The Polo-like kinases (PLKs) comprise a family of five serine/threonine protein kinases that control many crucial biological processes. The best characterized PLK family member is PLK1. Using MYCN-amplified neuroblastomas and small cell lung carcinomas as model systems, we recently demonstrated that PLK1 and Myc created a positive, feedforward activation loop that was essential for sustaining mutual high expression, leading to Myc-dependent transcriptional amplification and aggressive tumor progression. Inhibitors of PLK1, such as BI 6727 or BI2356, preferentially induce potent apoptosis of Myc-overexpressing tumor cells and synergistically potentiate the therapeutic efficacies of BCL-2 antagonists. These findings reveal a PLK1-FBW7-Myc signaling circuit that underlies tumorigenesis and validate PLK1 inhibitors, alone or with BCL-2 antagonists, as potential effective therapeutics for Myc-overexpressing cancers.

Targeting the MYC–MAX complex

The Myc–Max complex is required for the binding of Myc to DNA and its subsequent activation of target gene transcription. The Myc–Max dimer interface is a parallel, left-handed, four-helix bundle, with each monomer comprising two R-helices separated by a loop. Although studies have shown that this structure has no apparent sites for positioning a small-molecule inhibitor, several labs have screened small molecules that block this interaction. The peptide mimetic IIA6B17 was first reported as a small-molecule inhibitor of Myc–Max dimerization. A compound called 10058-F4 was capable of disrupting the Myc–Max complex in HL60 cells. Another widely known inhibitor, Omomyc, a mutant basic helix-loop-helix peptide that sequesters Myc in a transcriptionally incompetent complex, prevents Myc-induced tumorigenesis in multiple mouse tumor models.–

Synthetic lethal interaction with MYC

Two genes (“A” and “B”) are said to be “synthetic lethal” if mutation of either gene alone is compatible with viability but simultaneous mutation of both genes causes death. Synthetic lethal interactions are most commonly described for loss-of-function alleles but can also involve gain-of-function alleles. For example, gene A might become essential for survival when a particular gene B is overexpressed. This situation describes Myc-mediated synthetic lethality. MYC overexpression is found in many cancers, and MYC overexpression sensitizes cells to apoptosis, enabling targeting a gene that is synthetic lethal to a cancer-relevant MYC overexpression should kill only cancer cells but spare normal counterparts. Here, we describe key factors that exhibit synthetic lethal interactions with Myc deregulation (Fig. 4).

Cyclin-dependent kinase 1 (CDK1)

CDK1 is a catalytic subunit of the highly conserved protein kinase complex known as the M-phase-promoting factor, which is essential for the G1/S and G2/M-phase transitions of the eukaryotic cell cycle. RNAi screens for synthetic lethality in MYC overexpressing cells highlight the promise of targeting this cell-cycle kinase for Myc-dependent cancers. Indeed, inhibiting CDK1 function using the small molecule purvalanol A selectively induced apoptosis in cells with MYC overexpression and significantly decreased tumor growth in Myc-dependent lymphoma and hepatoblastoma mouse models. It appears that the selective induction of apoptosis upon CDK1 inhibition is associated with upregulation of the pro-apoptotic molecule BIM and/or downregulation of the anti-apoptotic molecule survivin., It should be noted that CDK1 inhibition could also selectively kill transformed cells by targeting E2F-1 and/or enhancer of zeste homolog 2 (EZH2)., Most likely, multiple mechanisms contributed to the CDK1 inhibition-induced tumor regression. Nevertheless, these results suggest the potential value of targeting CDK1 in Myc-driven cancers.

Checkpoint kinase 1 (CHK1)

CHK1 has a key role in cell-cycle progression and DNA damage checkpoint control., The use of CHK1 inhibitors to treat cancer was derived from observations that tumor cells without DNA damage checkpoints during tumorigenesis or therapy are highly sensitive to additional genomic instability. Myc deregulation is sufficient to induce genome instability. Myc induces replication stresses and DNA damages through excessive replication-fork firing, making Myc-overexpressing tumors substantially more sensitive to CHK1 inhibition. As such, CHK1 inhibition leads to massive cell death in Myc-overexpressing lymphomas, neuroblastomas, breast and lung cancers.–

Glutaminase (GLS)

Many tumor cells rely on glutamine metabolism to fuel their unabated growth and proliferation., Oncogenic Myc increases the surface expression of glutamine transporters and alters mitochondrial metabolism, making the cell dependent on exogenous glutamine for survival.– Glutamine is converted to glutamate by GLS, an enzyme that is highly expressed in tumor cells. Accordingly, inhibition of glutamine metabolism by GLS inhibitors selectively induces apoptosis in Myc-overexpressing tumor cells.– Of note, CB-839, a potent and selective GLS inhibitor, is currently in phase I clinical studies for treating leukemias and other hematological tumors with Myc deregulation.

Conclusion and perspectives

Here, we have described multiple pharmacological approaches to indirectly target Myc at different levels (Table 1). These approaches should be translated as a strategy to move forward in future patient care, as patients with Myc deregulation are likely to respond. Although direct targeting of Myc has not yet been achieved, promise remains in developing innovative approaches to effectively and specifically target this cancer super-controller. As a matter of fact, BCL-2 was also considered undruggable until a decade of fragment-based nuclear magnetic resonance (NMR) screening altered and broadened the view of this potential inhibitory molecule. Whether through direct or indirect targeting of Myc, better therapeutics to target Myc-dependent cancers will be required in the future.

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    Not in our library10.1128/mcb.21.13.4129-4139.2001

  67. 67.

    Furnari B, Rhind N, Russell P. Cdc25 mitotic inducer targeted by chk1 DNA damage checkpoint kinase. Science. 1997;277:1495-1497.

    Not in our library10.1126/science.277.5331.1495

  68. 68.

    Höglund A, et al. Therapeutic implications for the induced levels of Chk1 in Myc-expressing cancer cells. Clin. Cancer Res. 2011;17:7067-7079.

    Not in our library10.1158/1078-0432.ccr-11-1198

  69. 69.

    Dominguez-Sola D, et al. Non-transcriptional control of DNA replication by c-Myc. Nature. 2007;448:445-451.

    Not in our library10.1038/nature05953

  70. 70.

    Cole KA, et al. RNAi screen of the protein kinome identifies checkpoint kinase 1 (CHK1) as a therapeutic target in neuroblastoma. Proc. Natl Acad. Sci. USA. 2011;108:3336-3341.

    Not in our library10.1073/pnas.1012351108

  71. 71.

    Murga M, et al. Exploiting oncogene-induced replicative stress for the selective killing of Myc-driven tumors. Nat. Struct. Mol. Biol. 2011;18:1331-1335.

    Not in our library10.1038/nsmb.2189

  72. 72.

    Ferrao PT, Bukczynska EP, Johnstone RW, McArthur GA. Efficacy of CHK inhibitors as single agents in MYC-driven lymphoma cells. Oncogene. 2012;31:1661-1672.

    Not in our library10.1038/onc.2011.358

  73. 73.

    DeBerardinis RJ, Lum JJ, Hatzivassiliou G, Thompson CB. The biology of cancer: metabolic reprogramming fuels cell growth and proliferation. Cell Metab. 2008;7:11-20.

    Not in our library10.1016/j.cmet.2007.10.002

  74. 74.

    Dang CV. A time for MYC: metabolism and therapy. Cold Spring Harb. Symp. Quant. Biol. 2016;81:79-83.

    Not in our library10.1101/sqb.2016.81.031153

  75. 75.

    Yuneva M, Zamboni N, Oefner P, Sachidanandam R, Lazebnik Y. Deficiency in glutamine but not glucose induces MYC-dependent apoptosis in human cells. J. Cell Biol. 2007;178:93-105.

    Not in our library10.1083/jcb.200703099

  76. 76.

    Gao P, et al. c-Myc suppression of miR-23a/b enhances mitochondrial glutaminase expression and glutamine metabolism. Nature. 2009;458:762-765.

    Not in our library10.1038/nature07823

  77. 77.

    Mullen AR, et al. Reductive carboxylation supports growth in tumour cells with defective mitochondria. Nature. 2011;481:385-388.

    Not in our library10.1038/nature10642

  78. 78.

    Metallo CM, et al. Reductive glutamine metabolism by IDH1 mediates lipogenesis under hypoxia. Nature. 2011;481:380-384.

    Not in our library10.1038/nature10602

  79. 79.

    Qing G, et al. ATF4 regulates MYC-mediated neuroblastoma cell death upon glutamine deprivation. Cancer Cell. 2012;22:631-644.

    Not in our library10.1016/j.ccr.2012.09.021

  80. 80.

    Xiao D, et al. Myc promotes glutaminolysis in human neuroblastoma through direct activation of glutaminase 2. Oncotarget. 2015;6:40655-40666.

    Not in our library10.18632/oncotarget.5821

  81. 81.

    Jacque N, et al. Targeting glutaminolysis has antileukemic activity in acute myeloid leukemia and synergizes with BCL-2 inhibition. Blood. 2015;126:1346-1356.

    Not in our library10.1182/blood-2015-01-621870

  82. 82.

    Superti-Furga G, et al. Where is the future of drug discovery for cancer? Cell. 2017;168:564-565.

    Not in our library10.1016/j.cell.2017.01.032

  83. 83.

    Fong CY, et al. BET inhibitor resistance emerges from leukaemia stem cells. Nature. 2015;525:538-542.

    Not in our library10.1038/nature14888

  84. 84.

    Matkar S, et al. An epigenetic pathway regulates sensitivity of breast cancer cells to HER2 inhibition via FOXO/c-Myc axis. Cancer Cell. 2015;28:472-485.

    Not in our library10.1016/j.ccell.2015.09.005

  85. 85.

    Cicenas J, et al. Roscovitine in cancer and other diseases. Ann. Transl. Med. 2015;3:135.

    Not in our library10.3978/j.issn.2305-5839.2015.03.61

  86. 86.

    Awan FT, et al. A phase 1 clinical trial of flavopiridol consolidation in chronic lymphocytic leukemia patients following chemoimmunotherapy. Ann. Hematol. 2016;95:1137-1143.

    Not in our library10.1007/s00277-016-2683-1

  87. 87.

    Vignot S, Faivre S, Aguirre D, Raymond E. mTOR-targeted therapy of cancer with rapamycin derivatives. Ann. Oncol. 2005;16:525-537.

    Not in our library10.1093/annonc/mdi113

  88. 88.

    Xu CX, et al. The combination of RAD001 and NVP-BEZ235 exerts synergistic anticancer activity against non-small cell lung cancer in vitro and in vivo. PLoS ONE. 2011;6:e20899.

    Not in our library10.1371/journal.pone.0020899

  89. 89.

    Pal SK, Reckamp K, Yu H, Figlin RA. Akt inhibitors in clinical development for the treatment of cancer. Expert Opin. Investig. Drugs. 2010;19:1355-1366.

    Not in our library10.1517/13543784.2010.520701

  90. 90.

    Blackburn JS, et al. Clonal evolution enhances leukemia-propagating cell frequency in T cell acute lymphoblastic leukemia through Akt/mTORC1 pathway activation. Cancer Cell. 2014;25:366-378.

    Not in our library10.1016/j.ccr.2014.01.032

  91. 91.
    Discovery and development of the Polo-like kinase inhibitor volasertib in cancer therapy · 2014
    No notice
  92. 92.

    Schoffski P, et al. A phase I, dose-escalation study of the novel Polo-like kinase inhibitor volasertib (BI 6727) in patients with advanced solid tumours. Eur. J. Cancer. 2012;48:179-186.

    Not in our library10.1016/j.ejca.2011.11.001

  93. 93.

    Sebastian M, et al. The efficacy and safety of BI 2536, a novel Plk-1 inhibitor, in patients with stage IIIB/IV non-small cell lung cancer who had relapsed after, or failed, chemotherapy: results from an open-label, randomized phase II clinical trial. J. Thorac. Oncol. 2010;5:1060-1067.

    Not in our library10.1097/jto.0b013e3181d95dd4

  94. 94.

    Awad MM, et al. An open-label, phase II study of the polo-like kinase-1 (Plk-1) inhibitor, BI 2536, in patients with relapsed small cell lung cancer (SCLC). Lung Cancer. 2017;104:126-130.

    Not in our library10.1016/j.lungcan.2016.12.019

  95. 95.

    Cassaday RD, et al. A phase II, single-arm, open-label, multicenter study to evaluate the efficacy and safety of P276-00, a cyclin-dependent kinase inhibitor, in patients with relapsed or refractory mantle cell lymphoma. Clin. Lymphoma Myeloma Leuk. 2015;15:392-397.

    Not in our library10.1016/j.clml.2015.02.021

  96. 96.

    Sen T, et al. CHK1 inhibition in small-cell lung cancer produces single-agent activity in biomarker-defined disease subsets and combination activity with cisplatin or olaparib. Cancer Res. 2017;77:3870-3884.

    Not in our library10.1158/0008-5472.can-16-3409

  97. 97.

    Hong D, et al. Phase I study of LY2606368, a checkpoint kinase 1 inhibitor, in patients with advanced cancer. J. Clin. Oncol. 2016;34:1764-1771.

    Not in our library10.1200/jco.2015.64.5788

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