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Robert Stewart, PhD

Associate Professor

Education and Training

College: Kansas State University, Manhattan, KS

Graduate School: Kansas State University, Manhattan, KS

Selected Publications from a Total of 70:

Moffitt GB, Wootton LS, Hårdemark B, Sandison GA, Laramore GE, Parvathaneni U, Stewart RD. Scattering kernels for fast neutron therapy treatment planning. Phys Med Biol. 2020 Jun 8. doi: 10.1088/1361-6560/ab9a85. Online ahead of print. PMID: 32512540

Oztek MA, Mayr NA, Mossa-Basha M, Nyflot M, Sponseller PA, Wu W, Hofstetter CP, Saigal R, Bowen SR, Hippe DS, Yuh WTC, Stewart RD, Lo SS. The Dancing Cord: Inherent Spinal Cord Motion and Its Effect on Cord Dose in Spine Stereotactic Body Radiation Therapy. Neurosurgery. 2020 Jun 4:nyaa202. doi: 10.1093/neuros/nyaa202. PMID: 32497210

Chvetsov AV, Stewart RD, Kim M, Meyer J, Rengan R. Volume effects in the TCP for hypoxic and oxygenated tumors. Med Phys. 2020 May 26. doi: 10.1002/mp.14257. PMID: 32452034

Tseng YD, Maes SM, Kicska G, Sponsellor P, Traneus E, Wong T, Stewart RD, Saini J. Comparative photon and proton dosimetry for patients with mediastinal lymphoma in the era of Monte Carlo treatment planning and variable relative biological effectiveness. Radiat Oncol. 2019 Dec 30;14(1):243. doi: 10.1186/s13014-019-1432-8. PMID: 31888769

Stewart RD, Carlson DJ, Butkus MP, Hawkins R, Friedrich T, Scholz M. A comparison of mechanism-inspired models for particle relative biological effectiveness (RBE).  Med Phys. 2018 Nov;45(11):e925-e952. doi: 10.1002/mp.13207. PMID: 30421808

Paganetti H, Blakely E, Carabe-Fernandez A, Carlson DJ, Das IJ, Dong L, Grosshans D, Held KD, Mohan R, Moiseenko V, Niemierko A, Stewart RD, Willers H.  Report of the AAPM TG-256 on the relative biological effectiveness of proton beams in radiation therapy.  Med Phys. 2019 Mar;46(3):e53-e78. doi: 10.1002/mp.13390. Epub 2019 Feb 14. PMID: 30661238

Stewart RD. Induction of DNA Damage by Light Ions Relative to 60Co γ-rays.  Int J Part Ther. 2018 Summer;5(1):25-39. doi: 10.14338/IJPT-18-00030. Epub 2018 Sep 21. PMID: 31773018

Meyer J, Stewart RD, Smith D, Eagle J, Lee E, Cao N, Ford E, Hashemian R, Schuemann J, Saini J, Marsh S, Emery R, Dorman E, Schwartz J, Sandison G.  Biological and dosimetric characterisation of spatially fractionated proton minibeams.  Phys Med Biol. 2017 Nov 21;62(24):9260-9281. doi: 10.1088/1361-6560/aa950c. PMID: 29053105

Streitmatter SW, Stewart RD, Jenkins PA, Jevremovic T, DNA Double Strand Break (DSB) Induction and Cell Survival in Iodine-Enhanced Computed Tomography (CT). Phys Med Biol. 62, 6164-6184 (2017).

Moffitt GB, Stewart RD, Sandison GA, Goorley JT, Argento DC, Jevremovic T. MCNP6 model of the University of Washington clinical neutron therapy system (CNTS). Phys Med Biol. 61(2):937-957 (2016).

Nikitaki Z, Mavragani IV, Laskaratou DA, Gika V, Moskvin VP, Theofilatos K, Vougas K, Stewart RD, Georgakilas AG6.. Systemic mechanisms and effects of ionizing radiation: A new ‘old’ paradigm of how the bystanders and distant can become the players. Semin Cancer Biol. (2016) pii: S1044-579X(16)30004-9. doi: 0.1016/j.semcancer.2016.02.002.

Stewart RD, Streitmatter SW, Argento DC, Kirkby C, Goorley JT, Moffitt G, Jevremovic T, Sandison GA, Rapid MCNP Simulation of DNA Double Strand Break (DSB) Relative Biological Effectiveness (RBE) for Photons, Neutrons, and Light Ions. Phys. Med. Biol. 60(21), 8249-8274 (2015).

Kim M, Stewart RD, Phillips MH. A feasibility study: Selection of a personalized radiotherapy fractionation schedule using spatiotemporal optimization. Med Phys. 42(11), 6671-6678 (2015).

Stewart RD, Yu VK, Georgakilas AG, Koumenise C, Park JH, Carlson DJ, Effects of Radiation Quality and Oxygen on Clustered DNA Lesions and Cell Death, Radiat. Res. 176, 587-602 (2011)

Semenenko VA, Stewart RD, Ackerman EJ. Monte Carlo Simulation of Base and Nucleotide Excision Repair of Clustered DNA Damage Sites. I. Model Properties and Predicted Trends. Radiat. Res. 164, 180-193 (2005)

Semenenko VA, Stewart RD. Monte Carlo Simulation of Base and Nucleotide Excision Repair of Clustered DNA Damage Sites. II. Comparisons of Model Predictions to Measured Data. Radiat. Res. 164, 194-201 (2005)

Semenenko VA, Stewart RD. Fast Monte Carlo simulation of DNA damage formed by electrons and light ions. Phys. Med. Biol. 51(7), 1693-1706 (2006)

Semenenko VA, Stewart RD. A Fast Monte Carlo Algorithm to Simulate the Spectrum of DNA Damages Formed by Ionizing Radiation. Radiat. Res. 161, 451-457, (2004)

Research Interests

  • Mechanism-inspired biophysical modeling of particle relative biological effectiveness (RBE)
  • Mechanisms of interaction related to radiation and the immune system
  • Radiation biology in clinical decision making and outcome assessment
  • Intensity modulated neutron therapy (IMNT) for the treatment of cancers resistant to low linear energy transfer (LET) radiations

Clinical interests

  • Personalized delivery of radiation- and immune-therapies
  • Treatment personalization to exploit particle RBE, dose and dose rate effects

Education Involvement

  • Didactic Instructor, radiation biology
  • Mentor, clinical development projects (especially translation research related to radiation biology)

Professional Involvement

  • Associate Editor, British Journal of Radiology (Radiation Biology)
  • AAPM TG-256 on Proton RBE (published 2019)