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  • American Association for Cancer Research (AACR)  (7)
  • Byers, Lauren A.  (7)
  • Myers, Jeffrey N.  (7)
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  • American Association for Cancer Research (AACR)  (7)
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  • 1
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 75, No. 15_Supplement ( 2015-08-01), p. 417-417
    Abstract: Background: HNSCC is the sixth most common cancer worldwide. To date, Cetuximab is the only approved targeted therapy for HNSCC treatment. Thus,there is an immediate need to discover effective targets. Two pharmacogenomic HTS studies, Cancer Genome Project (CGP) and Cancer Cell Line Encyclopedia (CCLE) provide a large repository of drug sensitivity data. The PI3K/mTOR pathway is one of the frequently activated signaling cascades in HNSCC. However, it is unclear which class of PI3K/mTOR inhibitors is most promising and which biomarkers may be used to predict sensitivity. The rationale for this study is to identify novel biomarkers to targets such as PI3K/mTOR pathway by data mining these public databases. The potential biomarkers will be characterized in vitro in 68 HNSCC cell lines.Methods:The landscape of drug sensitivity profiles in 23 HNSCC cell lines (CGP) was analyzed by boxplot illustrations. Drugs that induce growth inhibition at low doses (median≤10 μM) were considered “effective”. Chemotherapy drugs, drugs with missing values and unknown targets were excluded from analyses. Hierarchical clustering of cell lines was performed based on drug sensitivity using GOWER distance metric and Ward's linkage after normalization. Clustering of 140 drugs based on their sensitivity profiles was also done. In vitro, drug response to PI3K pathway inhibitors in 28 HNSCC cell lines was assessed by ATP based cell viability assay (CellTiter-Glo). Results: In the CGP datasets, we identified a set of effective drugs with median IC75 & lt;10 μM. These include drugs targeting HDAC, HSP, BCL2 and CHK1/2, and PI3K/mTOR pathway. When hierarchical clustering of drugs based on drug sensitivity was performed, 3 clusters were classified. Predictably, chemotherapy agents clustered together. Selective drugs that were effective in a subset of cell lines were also identified. To identify cell lines that were uniformly sensitive to inhibitors targeting the PI3K/mTOR pathway, diverse classes of inhibitors targeting PI3K pathway were selected and drug sensitivity was analyzed across 28 HNSCC cell lines. Notably, all cell lines were sensitive to the pan Class I PI3K inhibitor, BKM120 (IC75 & lt;Cmax: 1.68 μM). We identified seven lines that were resistant and twelve lines that were sensitive to different PI3K/mTOR inhibitors. To identify novel biomarkers of sensitivity, we will use Reverse Phase Protein Array (RPPA), exome sequencing and gene expression data on cells that are uniformly sensitive and resistant to PI3K pathway inhibition. Conclusion: HNSCC cell lines were sensitive to a broad range of targeted therapies in in vitro screens including several inhibitors of the PI3K/mTOR pathway. We independently confirmed sensitivity to similar inhibitors and identified lines that were universally sensitive and resistant to this class of drug for biomarker development. Citation Format: Vaishnavi Sambandam, Li Shen, Ming Zhang, Rishi Saigal, Lauren A. Byers, Curtis Pickering, Jeffrey N. Myers, Jing Wang, Faye M. Johnson. Integrative drug sensitivity analysis of PI3K /mTOR pathway inhibitors in Head and Neck Squamous Cell Carcinoma (HNSCC). [abstract]. In: Proceedings of the 106th Annual Meeting of the American Association for Cancer Research; 2015 Apr 18-22; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Res 2015;75(15 Suppl):Abstract nr 417. doi:10.1158/1538-7445.AM2015-417
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    RVK:
    RVK:
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2015
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  • 2
    In: Clinical Cancer Research, American Association for Cancer Research (AACR), Vol. 22, No. 18 ( 2016-09-15), p. 4643-4650
    Abstract: Purpose: Head and neck squamous cell carcinoma (HNSCC) is commonly treated with radiotherapy, and local failure after treatment remains the major cause of disease-related mortality. To date, human papillomavirus (HPV) is the only known clinically validated, targetable biomarkers of response to radiation in HNSCC. Experimental Design: We performed proteomic and transcriptomic analysis of targetable biomarkers of radioresistance in HPV-negative HNSCC cell lines in vitro, and tested whether pharmacologic blockade of candidate biomarkers sensitized cells to radiotherapy. Candidate biomarkers were then investigated in several independent cohorts of patients with HNSCC. Results: Increased expression of several targets was associated with radioresistance, including FGFR, ERK1, EGFR, and focal adhesion kinase (FAK), also known as PTK2. Chemical inhibition of PTK2/FAK, but not FGFR, led to significant radiosensitization with increased G2–M arrest and potentiated DNA damage. PTK2/FAK overexpression was associated with gene amplification in HPV-negative HNSCC cell lines and clinical tumors. In two independent cohorts of patients with locally advanced HPV-negative HNSCC, PTK2/FAK amplification was highly associated with poorer disease-free survival (DFS; P = 0.012 and 0.034). PTK2/FAK mRNA expression was also associated with worse DFS (P = 0.03). Moreover, both PTK2/FAK mRNA (P = 0.021) and copy number (P = 0.063) were associated with DFS in the Head and Neck Cancer subgroup of The Cancer Genome Atlas. Conclusions: Proteomic analysis identified PTK2/FAK overexpression is a biomarker of radioresistance in locally advanced HNSCC, and PTK2/FAK inhibition radiosensitized HNSCC cells. Combinations of PTK2/FAK inhibition with radiotherapy merit further evaluation as a therapeutic strategy for improving local control in HPV-negative HNSCC. Clin Cancer Res; 22(18); 4643–50. ©2016 AACR.
    Type of Medium: Online Resource
    ISSN: 1078-0432 , 1557-3265
    RVK:
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2016
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  • 3
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 75, No. 15_Supplement ( 2015-08-01), p. 2427-2427
    Abstract: Objectives: Infection with the human papillomavirus (HPV) is an important risk factor for development of head and neck squamous cell carcinoma (HNSCC). Strikingly, HPV-positive HNSCCs carry a more favorable prognosis and are a biologically distinct subgroup when compared with their HPV-negative counterparts. We aimed to discover novel therapeutic targets by conducting a high-throughput drug screening platform in vitro with both FDA approved and investigational drugs. Based on our prior proteomic analysis we tested inhibitors of pathways activated in HPV+ HNSCC tumors. Methods: Cell viability assays were performed by the Cell Titer Glo method in a panel of 66 fingerprinted HNSCC cell lines using 13 drugs at concentrations of 0.011 to 9.613 μM. This panel includes 9 HPV+ lines and 57 HPV- lines (5 oropharynx, 15 oral cavity, and 37 others). The IC50 values were calculated. Western Blot assay was used to confirm that the drugs inhibited their targets. Results: We observed a wide range of sensitivities to all 13 drugs with the exception of BKM120 which was effective in all tested lines (Table 1). In contrast, nearly all cell lines were resistant to BMN673, ruxolitinib, LEE011, and selicilib. The HPV+ cell lines were more sensitive to MEK162 (p & lt;0.05) and resistant to Bosutinib (p & lt;0.01) when compared to the HPV- HNSCC cell lines or oropharynx and oral cavity cell lines (Table 2). Western blotting confirmed target inhibition for the targeted therapies. Conclusions: For most agents tested, HNSCC cell lines displayed similar drug sensitivity regardless of the tumor site. However, HPV+ lines were more sensitive to MEK162 and more resistant to Bosutinib. Future analysis will include comparing drug sensitivity to mutation, gene and protein expression in these lines. Taken together, the results may provide a rationale for the clinical evaluation of MEK inhibitors as a molecular targeted approach for the treatment of HPV+ HNSCC. Table 1. IC50 values in 66 HNSCC cell lines DrugDrug's targetMedian IC50 (μM)Range of IC50(μM)Cmax (μM)ErlotinibEGFR5.970.12- & gt;9.614LEE011CDK4/69.610.01- & gt;9.61NABKM120PI3K0.640.01- & gt;1.434MEK162MEK9.610.01- & gt;9.611BosutinibSrc2.320.19- & gt;9.610.8SeliciclibCDK2/59.610.01- & gt;9.619.02VolasertibPLK1.120.01- & gt;9.611.2AZD7762CHK1/20.120.02- & gt;3.02NADocetaxelChemotherapy9.610.01- & gt;9.610.08CisplatinChemotherapy8.620.01- & gt;9.617.33RuxolitinibJAK9.610.01- & gt;9.611.48AZD1775Wee10.250.03- & gt;7.521.65BMN673PARP9.610.20- & gt;9.610.07 Citation Format: Ming Zhang, Tuhina Mazumdar, Shaohua Peng, Pan Tong, Vaishnavi Sambandam, Lauren A. Byers, Jeffrey N. Myers, Jing Wang, Faye M. Johnson. The difference of drug sensitivity between HPV-positive and HPV-negative head and neck squamous cell carcinoma cell lines. [abstract]. In: Proceedings of the 106th Annual Meeting of the American Association for Cancer Research; 2015 Apr 18-22; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Res 2015;75(15 Suppl):Abstract nr 2427. doi:10.1158/1538-7445.AM2015-2427
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
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    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2015
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  • 4
    In: Clinical Cancer Research, American Association for Cancer Research (AACR), Vol. 23, No. 11 ( 2017-06-01), p. 2713-2722
    Abstract: Purpose: The primary cause of death due to head and neck squamous cell carcinoma (HNSCC) is local treatment failure. The goal of this study was to examine this phenomenon using an unbiased approach. Experimental Design: We utilized human papilloma virus (HPV)-negative cell lines rendered radiation-resistant (RR) via repeated exposure to radiation, a panel of HPV-negative HNSCC cell lines and three cohorts of HPV-negative HNSCC tumors (n = 68, 97, and 114) from patients treated with radiotherapy and subjected to genomic, transcriptomic, and proteomic analysis. Results: RR cell lines exhibited upregulation of several proteins compared with controls, including increased activation of Axl and PI3 kinase signaling as well as increased expression of PD-L1. Additionally, inhibition of either Axl or PI3 kinase led to decreased PD-L1 expression. When clinical samples were subjected to RPPA and mRNA expression analysis, PD-L1 was correlated with both Axl and PI3K signaling as well as dramatically associated with local failure following radiotherapy. This finding was confirmed examining a third cohort using immunohistochemistry. Indeed, tumors with high expression of PD-L1 had failure rates following radiotherapy of 60%, 70%, and 50% compared with 20%, 25%, and 20% in the PD-L1–low expression group (P = 0.01, 1.9 × 10−3, and 9 × 10−4, respectively). This finding remained significant on multivariate analysis in all groups. Additionally, patients with PD-L1 low/CD8+ tumor-infiltrating lymphocytes high had no local failure or death due to disease (P = 5 × 10−4 and P = 4 × 10−4, respectively). Conclusions: Taken together, our data point to a targetable Axl–PI3 kinase–PD-L1 axis that is highly associated with radiation resistance. Clin Cancer Res; 23(11); 2713–22. ©2017 AACR.
    Type of Medium: Online Resource
    ISSN: 1078-0432 , 1557-3265
    RVK:
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2017
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  • 5
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 78, No. 3 ( 2018-02-01), p. 781-797
    Abstract: Checkpoint kinase inhibitors (CHKi) exhibit striking single-agent activity in certain tumors, but the mechanisms accounting for hypersensitivity are poorly understood. We screened a panel of 49 established human head and neck squamous cell carcinoma (HNSCC) cell lines and report that nearly 20% are hypersensitive to CHKi monotherapy. Hypersensitive cells underwent early S-phase arrest at drug doses sufficient to inhibit greater than 90% of CHK1 activity. Reduced rate of DNA replication fork progression and chromosomal shattering were also observed, suggesting replication stress as a root causative factor in CHKi hypersensitivity. To explore genomic underpinnings of CHKi hypersensitivity, comparative genomic analysis was performed between hypersensitive cells and cells categorized as least sensitive because they showed drug IC50 value greater than the cell panel median and lacked early S-phase arrest. Novel association between CDKN2A/p16 copy number loss, CDK2 activation, replication stress, and hypersensitivity of HNSCC cells to CHKi monotherapy was found. Restoring p16 in cell lines harboring CDKN2A/p16 genomic deletions alleviated CDK2 activation and replication stress, attenuating CHKi hypersensitivity. Taken together, our results suggest a biomarker-driven strategy for selecting HNSCC patients who may benefit the most from CHKi therapy. Significance: These results suggest a biomarker-driven strategy for selecting HNSCC patients who may benefit the most from therapy with CHK inhibitors. Cancer Res; 78(3); 781–97. ©2017 AACR.
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    RVK:
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    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2018
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  • 6
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 75, No. 15_Supplement ( 2015-08-01), p. 3441-3441
    Abstract: One of the primary treatments for head and neck squamous cell carcinoma (HNSCC) is radiotherapy. Despite decades of study, few if any targetable biomarkers for resistance to this modality. To systematically evaluate resistance to radiotherapy in HNSCC, we evaluated 50 HNSCC cell lines using reverse phase protein array (RPPA). Utilizing this method we identified 11 protein markers with altered expression in radioresistant HNSCC cell lines (FDR 1%), including PTK2/FAK. Both PTK2/Fak gene expression and copy number were highly correlated to PTK2/Fak protein expression and both were associated with radioresistance in these cell lines. Additionally, in clinical samples from the TCGA, PTK2/Fak copy number was highly associated with gene expression, with high expression levels in HNSCC tumors. To validate the association between PTK2/Fak and clinical radioresistance in HNSCC, we examined PTK2/FAK copy number in two separate cohorts of HNSCC patients treated uniformly with radiotherapy (n = 39 and n = 44). In both cohorts, PTK2/Fak amplification was associated with treatment failure following radiotherapy (p = 0.04 and p = 0.03 respectively and p = 0.004 for the combined population). Additionally, in a separate cohort of HNSCC patients treated with radiotherapy, high levels of PTK2/Fak gene expression were associated with failure following radiotherapy (p = 0.02). Additionally, in vitro pharmacologic inhibition of PTK2/FAK function led to radiosensitization in multiple HNSCC cell lines, primarily via induction of G2/M arrest, with minimal apoptosis observed. Taken together, these data identify a validated, targetable biomarker of radioresistance in HNSCC. Citation Format: Heath D. Skinner, Uma Giri, John S. Yordy, Michael D. Story, Jing Wang, Lauren A. Byers, Michelle D. Williams, Adel K. El-Naggar, Sang H. Woo, Liang P. Yang, You Fan, Curtis R. Pickering, Jeffrey N. Myers,, John V. Heymach. Proteomic profiling identifies PTK2/FAK as a targetable marker of radioresistance in head and neck cancer. [abstract]. In: Proceedings of the 106th Annual Meeting of the American Association for Cancer Research; 2015 Apr 18-22; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Res 2015;75(15 Suppl):Abstract nr 3441. doi:10.1158/1538-7445.AM2015-3441
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    RVK:
    RVK:
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2015
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  • 7
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 76, No. 14_Supplement ( 2016-07-15), p. 393-393
    Abstract: Recently published whole exome sequencing studies in head and neck squamous cell carcinoma (HNSCC) tumors revealed that few had therapeutically targetable alterations using current strategies. This finding defines translational gap between genomics and HNSCC treatment. One potential targetable alteration is PIK3CA mutations. However, clinical trials testing PI3K/mTOR pathway inhibitors have had limited success and these inhibitors only lead to cell cycle arrest in PIK3CA mutant HNSCC cell lines. Thus, there is a critical need to identify therapeutic vulnerabilities for common mutation groups, including tumor suppressors, in HNSCC. One of these molecular subgroups is NOTCH1 which is the second most frequently mutated gene in HNSCC, with a 10-15% prevalence of inactivating mutations. Although there are several studies underscoring the importance of NOTCH1 as a tumor suppressor in HNSCC, none has identified a therapy that targets NOTCH1 mutant (mut) HNSCC. Our objective was to identify predictive biomarkers of sensitivity to PI3K/mTOR inhibitors by integrating drug and multiple-omics data. Cell viability with six PI3K/mTOR inhibitors in 68 HNSCC lines was measured by the CellTiter Glo assay. The peak plasma concentration of each drug was used as the cut-off to determine sensitivity. We observed a striking correlation between NOTCH1mut and sensitivity to PI3K/mTOR pathway inhibitors. When fisher's exact test was performed, NOTCH1mut lines were more sensitive to GSK2126458 (P & lt;0.027), BYL719 (P & lt;0.004) and PQR309 (P & lt;0.014) than NOTCH1 wild type cell lines. NOTCH1 was also identified as an upstream regulator in sensitive cell lines by Ingenuity® Pathway Analysis. Basal NOTCH1 protein expression was higher in HNSCC lines resistant to PI3K/mTOR inhibition using unsupervised hierarchical clustering of Reverse Phase Protein Array data. NOTCH1mut lines underwent more apoptosis after GSK2126458 treatment compared to NOTCH1wt lines (PCI15B- 48.1 fold; P & lt;0.05, HN31- 46.9 fold; P & lt;0.05). There was also increased accumulation of cells in G1 after GSK2126458 treatment in NOTCH1mut lines (PCI15B-1.3 fold, P & lt;0.05; HN31- 1.4 fold, P & lt;0.05). To check if inhibition of NOTCH1 pathway inhibition sensitizes NOTCH1wt lines to PI3K/mTOR inhibition, resistant NOTCH1wt lines were treated with Gamma secretase inhibitors and GSK2126458. The combination led to significantly decreased cell viability (DAPT- 1.5 fold and YO010227- 1.7 fold). The combination studies will be further expanded to 38 NOTCH1wt lines. On-going studies include assessment of drug sensitivity in vivo, mechanistic studies and the effect of genetic manipulation of NOTCH1 signaling on sensitivity to PI3K/mTOR inhibitors. Our data suggests that loss of active NOTCH1 signaling confers sensitivity to PI3K/mTOR inhibition. If the combination of NOTCH1 and PI3K/mTOR inhibition leads to apoptosis, this combination could be translated into the clinic. Citation Format: Faye M. Johnson, Vaishnavi Sambandam, Li Shen, Ming Zhang, Rishi Saigal, Pan Tong, Tuhina Mazumdar, Lauren A. Byers, Curtis Pickering, Jeffrey N. Myers, Jing Wang, Mitchell Frederick. NOTCH1 inactivating mutation mediates sensitivity to PI3K/mTOR inhibitors in head and neck squamous cell carcinoma. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 393.
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    RVK:
    RVK:
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2016
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