Stephen Keysar, PhD

Associate Research Professor, Medicine-Medical Oncology

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Publications

  • Gan GN, Eagles J, Keysar SB, Wang G, Glogowska MJ, Altunbas C, Anderson RT, Le PN, Morton JJ, Frederick B, Raben D, Wang XJ, Jimeno A. Hedgehog signaling drives radioresistance and stroma-driven tumor repopulation in head and neck squamous cancers. Cancer Res. 2014 Dec 1;74(23):7024-36. PubMed PMID: 25297633
  • Bowles DW, Diamond JR, Lam ET, Weekes CD, Astling DP, Anderson RT, Leong S, Gore L, Varella-Garcia M, Vogler BW, Keysar SB, Freas E, Aisner DL, Ren C, Tan AC, Wilhelm F, Maniar M, Eckhardt SG, Messersmith WA, Jimeno A. Phase I study of oral rigosertib (ON 01910.Na), a dual inhibitor of the PI3K and Plk1 pathways, in adult patients with advanced solid malignancies. Clin Cancer Res. 2014 Mar 15;20(6):1656-65. PubMed PMID: 24493827
  • Bowles DW, Keysar SB, Eagles JR, Wang G, Glogowska MJ, McDermott JD, Le PN, Gao D, Ray CE, Rochon PJ, Roop DR, Tan AC, Serracino HS, Jimeno A. A pilot study of cetuximab and the hedgehog inhibitor IPI-926 in recurrent/metastatic head and neck squamous cell carcinoma. Oral Oncol. 2016 Feb;53:74-9. PubMed PMID: 26705064
  • Allen CP, Tinganelli W, Sharma N, Nie J, Sicard C, Natale F, King M 3rd, Keysar SB, Jimeno A, Furusawa Y, Okayasu R, Fujimori A, Durante M, Nickoloff JA. DNA Damage Response Proteins and Oxygen Modulate Prostaglandin E2 Growth Factor Release in Response to Low and High LET Ionizing Radiation. Front Oncol. 2015;5:260. PubMed PMID: 26697402
  • Kleczko EK, Kim J, Keysar SB, Heasley LR, Eagles JR, Simon M, Marshall ME, Singleton KR, Jimeno A, Tan AC, Heasley LE. An Inducible TGF-ß2-TGFßR Pathway Modulates the Sensitivity of HNSCC Cells to Tyrosine Kinase Inhibitors Targeting Dominant Receptor Tyrosine Kinases. PLoS One. 2015;10(5):e0123600. PubMed PMID: 25946135
  • Morton JJ, Bird G, Keysar SB, Astling DP, Lyons TR, Anderson RT, Glogowska MJ, Estes P, Eagles JR, Le PN, Gan G, McGettigan B, Fernandez P, Padilla-Just N, Varella-Garcia M, Song JI, Bowles DW, Schedin P, Tan AC, Roop DR, Wang XJ, Refaeli Y, Jimeno A. XactMice: humanizing mouse bone marrow enables microenvironment reconstitution in a patient-derived xenograft model of head and neck cancer. Oncogene. 2015 Apr 20. [Epub ahead of print] PubMed PMID: 25893296
  • Doebele RC, Davis LE, Vaishnavi A, Le AT, Estrada-Bernal A, Keysar S, Jimeno A, Varella-Garcia M, Aisner DL, Li Y, Stephens PJ, Morosini D, Tuch BB, Fernandes M, Nanda N, Low JA. An Oncogenic NTRK Fusion in a Patient with Soft-Tissue Sarcoma with Response to the Tropomyosin-Related Kinase Inhibitor LOXO-101. Cancer Discov. 2015 Oct;5(10):1049-57. PubMed PMID: 26216294
  • Arcaroli JJ, Tai WM, McWilliams R, Bagby S, Blatchford PJ, Varella-Garcia M, Purkey A, Quackenbush KS, Song EK, Pitts TM, Gao D, Lieu C, McManus M, Tan AC, Zheng X, Zhang Q, Ozeck M, Olson P, Jiang ZQ, Kopetz S, Jimeno A, Keysar S, Eckhardt G, Messersmith WA. A NOTCH1 gene copy number gain is a prognostic indicator of worse survival and a predictive biomarker to a Notch1 targeting antibody in colorectal cancer. Int J Cancer. 2016 Jan 1;138(1):195-205. PubMed PMID: 26152787
  • Keysar SB, Le PN, Miller B, Jackson BC, Eagles JR, Nieto C, Kim J, Tang B, Glogowska MJ, Morton JJ, Padilla-Just N, Gomez K, Warnock E, Reisinger J, Arcaroli JJ, Messersmith WA, Wakefield LM, Gao D, Tan AC, Serracino H, Vasiliou V, Roop DR, Wang XJ, Jimeno A. Regulation of Head and Neck Squamous Cancer Stem Cells by PI3K and SOX2. J Natl Cancer Inst. 2017 Jan;109(1). PubMed PMID: 27634934
  • Oweida A, Bhatia S, Hirsch K, Calame D, Griego A, Keysar S, Pitts T, Sharma J, Eckhardt G, Jimeno A, Wang XJ, Parkash G, Califano J, Karam SD. Ephrin-B2 overexpression predicts for poor prognosis and response to therapy in solid tumors. Mol Carcinog. 2016 Sep 20. [Epub ahead of print] PubMed PMID: 27649287
  • Bhatia S, Hirsch K, Sharma J, Oweida A, Griego A, Keysar S, Jimeno A, Raben D, Krasnoperov V, Gill PS, Pasquale EB, Wang XJ, Karam SD. Enhancing radiosensitization in EphB4 receptor-expressing Head and Neck Squamous Cell Carcinomas. Sci Rep. 2016 Dec 12;6:38792. PubMed PMID: 27941840
  • Hernandez AL, Wang Y, Somerset HL, Keysar SB, Aisner DL, Marshall C, Bowles DW, Karam SD, Raben D, Jimeno A, Varella-Garcia M, Wang XJ. Inter- and intra-tumor heterogeneity of SMAD4 loss in head and neck squamous cell carcinomas. Mol Carcinog. 2018 Dec 21. [Epub ahead of print] PubMed PMID: 30575147
  • Le PN, Keysar SB, Miller B, Eagles JR, Chimed TS, Reisinger J, Gomez KE, Nieto C, Jackson BC, Somerset HL, Morton JJ, Wang XJ, Jimeno A. Wnt signaling dynamics in head and neck squamous cell cancer tumor-stroma interactions. Mol Carcinog. 2019 Mar;58(3):398-410. PubMed PMID: 30378175
  • Morton JJ, Keysar SB, Perrenoud L, Chimed TS, Reisinger J, Jackson B, Le PN, Nieto C, Gomez K, Miller B, Gao D, Somerset H, Wang XJ, Jimeno A. Dual use of hematopoietic and mesenchymal stem cells enhances engraftment and immune cell trafficking in an allogeneic humanized mouse model of head and neck cancer. Mol Carcinog. 2018 Nov;57(11):1651-1663. PubMed PMID: 30129680
  • Keysar SB, Eagles JR, Miller B, Jackson BC, Chowdhury FN, Reisinger J, Chimed TS, Le PN, Morton JJ, Somerset HL, Varella-Garcia M, Tan AC, Song JI, Bowles DW, Reyland ME, Jimeno A. Salivary Gland Cancer Patient-Derived Xenografts Enable Characterization of Cancer Stem Cells and New Gene Events Associated with Tumor Progression. Clin Cancer Res. 2018 Jun 15;24(12):2935-2943. PubMed PMID: 29555661
  • Chowdhury FN, Reisinger J, Gomez KE, Chimed TS, Thomas CM, Le PN, Miller B, Morton JJ, Nieto CM, Somerset HL, Wang XJ, Keysar SB, Jimeno A. Leading edge or tumor core: Intratumor cancer stem cell niches in oral cavity squamous cell carcinoma and their association with stem cell function. Oral Oncol. 2019 Nov;98:118-124. PubMed PMID: 31586893
  • Berggren KL, Restrepo Cruz S, Hixon MD, Cowan AT, Keysar SB, Craig S, James J, Barry M, Ozbun MA, Jimeno A, McCance DJ, Beswick EJ, Gan GN. MAPKAPK2 (MK2) inhibition mediates radiation-induced inflammatory cytokine production and tumor growth in head and neck squamous cell carcinoma. Oncogene. 2019 Nov;38(48):7329-7341. PubMed PMID: 31417185
  • Keysar SB, Gomes N, Miller B, Jackson BC, Le PN, Morton JJ, Reisinger J, Chimed TS, Gomez KE, Nieto C, Frederick B, Pronk GJ, Somerset HL, Tan AC, Wang XJ, Raben D, Su TT, Jimeno A. Inhibiting translation elongation with SVC112 suppresses cancer stem cells and inhibits growth in head and neck squamous carcinoma. Cancer Res. 2020 Jan 7. [Epub ahead of print] PubMed PMID: 31911553
  • Hernandez AL, Wang Y, Somerset HL, Keysar SB, Aisner DL, Marshall C, Bowles DW, Karam SD, Raben D, Jimeno A, Varella-Garcia M, Wang XJ. Inter- and intra-tumor heterogeneity of SMAD4 loss in head and neck squamous cell carcinomas. Mol Carcinog. 2019 May;58(5):666-673. PubMed PMID: 30575147
  • Le PN, Keysar SB, Miller B, Eagles JR, Chimed TS, Reisinger J, Gomez KE, Nieto C, Jackson BC, Somerset HL, Morton JJ, Wang XJ, Jimeno A. Wnt signaling dynamics in head and neck squamous cell cancer tumor-stroma interactions. Mol Carcinog. 2019 Mar;58(3):398-410. PubMed PMID: 30378175
  • Bouhaddou M, Lee RH, Li H, Bhola NE, O'Keefe RA, Naser M, Zhu TR, Nwachuku K, Duvvuri U, Olshen AB, Roy R, Hechmer A, Bolen J, Keysar SB, Jimeno A, Mills GB, Vandenberg S, Swaney DL, Johnson DE, Krogan NJ, Grandis JR. Caveolin-1 and Sox-2 are predictive biomarkers of cetuximab response in head and neck cancer. JCI Insight. 2021 Oct 22;6(20). PubMed PMID: 34546978
  • Morton JJ, Alzofon N, Keysar SB, Chimed TS, Reisinger J, Perrenoud L, Le PN, Nieto C, Gomez K, Miller B, Yeager R, Gao D, Tan AC, Somerset H, Medina T, Wang XJ, Wang JH, Robinson W, Roop DR, Gonzalez R, Jimeno A. Studying Immunotherapy Resistance in a Melanoma Autologous Humanized Mouse Xenograft. Mol Cancer Res. 2021 Feb;19(2):346-357. PubMed PMID: 33087417
  • Nguyen KA, Keith MJ, Keysar SB, Hall SC, Bimali A, Jimeno A, Wang XJ, Young CD. Epidermal growth factor receptor signaling in precancerous keratinocytes promotes neighboring head and neck cancer squamous cell carcinoma cancer stem cell-like properties and phosphoinositide 3-kinase inhibitor insensitivity. Mol Carcinog. 2022 Jul;61(7):664-676. PubMed PMID: 35417043
  • Nieto C, Miller B, Alzofon N, Chimed T, Himes J, Joshi M, Gomez K, Chowdhury FN, Le PN, Weaver A, Somerset H, Morton JJ, Wang JH, Wang XJ, Gao D, Hansen K, Keysar SB, Jimeno A. The programmed death ligand 1 interactome demonstrates bidirectional signaling coordinating immune suppression and cancer progression in head and neck squamous cell carcinoma. J Natl Cancer Inst. 2023 Nov 8;115(11):1392-1403. PubMed PMID: 37389416

Specialty Information

Specialties
  • Psychology

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