Roman O. Kowalchuk, M.D.

  1. Radiation Oncologist
  1. Kowalchuk RO, Ahmed SK, Hara D, Tseung HWC, Schoettler PJ, Allen-Rhoades WA, Self CM, Owen D, Grams MP, Mahajan A, Laack NN. Encouraging Local Control With Pediatric Spatially Fractionated Radiation Therapy. Adv Radiat Oncol. 2026 Aug; 11 (8):102069 Epub 2026 June 23
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  2. Kowalchuk RO, Fossati P, Miller J, Sorenson KL, Spears GM, Frechette KM, Kraling AJ, Wilson Z, Daniels DJ, Schwartz J, Laack NN, Mahajan A. Strategic modulation to avoid radiation toxicities for brain integrity (SMART-BRAIN). Radiother Oncol. 2026 Jul 9; 111685 Epub 2026 July 09
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  3. Kessel AC, Kim H, Brown PD, Lehrer EJ, Laack NN, Mahajan A, Yan E, Schultz SE, Kizilbash S, Neth B, Sener U, Waddle M, Breen WG, Kowalchuk RO. Cost-effectiveness of vorasidenib in treatment of isocitrate dehydrogenase-mutated low-grade glioma. Cancer. 2026 Jun 1; 132 (11):e70463
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  4. Lucido JJ, Mullikin TC, Harmsen WS, Pulsipher SD, Johnson-Tesch BA, Morris JM, Rose PS, Siontis BL, Brinkmann DH, Owen D, Park SS, Rajkumar AW, Kowalchuk RO, Merrell KW. Long-Term Outcomes After Reirradiation With Spine Stereotactic Body Radiation Therapy: Single-Institutional Retrospective Experience. Pract Radiat Oncol. 2026 Mar-Apr; 16 (2):e131-e138 Epub 2025 Sept 03
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  5. Lozko Y, Beznosenko A, Suchowerska N, Iakovenko V, Zelinskyi R, Shepil Z, Brovchuk S, Kowalchuk R, Ford E, Li B, Strauss J, Das IJ, Seuntjens J, Wong RKS, Breiktreutz D, Avery S, Viswanathan AN, Aland T, Koscharsky R, Walsh A, Chen A, Chang DT, Le QT, Kovalchuk N. Advancing radiation oncology care in Ukraine during the war: impact of international observerships on professional development and clinical practice. Front Oncol. 2026; 16:1752691 Epub 2026 Mar 25
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  6. Frechette KM, Meyer AF, Leier SB, Harmsen WS, Pulsipher SD, Matysiak W, Bradley TB, Sener UT, Webb LM, Routman DM, Yan E, Laack NN, Brown PD, Lehrer EJ, Breen WG, Kowalchuk RO, Mahajan A. Real-World Experience Using Proton Versus Photon Craniospinal Irradiation for Leptomeningeal Disease. Pract Radiat Oncol. 2025 Sep-Oct; 15 (5):472-480 Epub 2025 Apr 29
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  7. Capp JC, Pennington Z, Hamouda A, Mikula AL, Lakomkin N, Sebastian AS, Freedman BA, Rose PS, Karim SM, Nassr A, Bydon M, Krauss WE, Fogelson JL, Kowalchuk RO, Merrell KW, Clarke MJ, Elder BD. Risk factors for early pathological fracture following stereotactic body radiation therapy for spinal metastases. Neurosurg Focus. 2025 May 1; 58 (5):E13
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  8. Florez MA, De B, Kowalchuk R, Tang C, Bishop AJ, Kouzy R, Amini B, Briere T, Beckham TH, Wang C, Li J, Tatsui CE, Rhines LD, Brown PD, Merrell K, Ghia AJ. Validation of the prognostic index for spine metastasis (PRISM) for stratifying survival in patients treated with spinal stereotactic body radiation. Radiother Oncol. 2024 Dec; 201:110570 Epub 2024 Oct 02
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  9. Pikis S, Mantziaris G, Protopapa M, Tos SM, Kowalchuk RO, Ross RB, Rusthoven CG, Tripathi M, Langlois AM, Mathieu D, Lee CC, Yang HC, Peker S, Samanci Y, Zhang MY, Braunstein SE, Wei Z, Niranjan A, Lunsford DL, Sheehan J. Stereotactic radiosurgery for brain metastases from human epidermal receptor 2 positive breast Cancer: an international, multi-center study. J Neurooncol. 2024 Oct; 170 (1):199-208 Epub 2024 Aug 27
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  10. Kowalchuk RO, Mullikin TC, Spears GM, Johnson-Tesch BA, Rose PS, Siontis BL, Kun Kim D, Costello BA, Morris JM, Gao RW, Shiraishi S, Lucido JJ, Olivier KR, Owen D, Stish BJ, Waddle MR, Laack NN, Park SS, Brown PD, Merrell KW. Assessment of minimum target dose as a predictor of local failure after spine SBRT. Radiother Oncol. 2024 Jun; 195:110260. Epub 2024 Mar 27.
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  11. Sutton EA, Kamdem Talom BC, Ebner DK, Weiskittel TM, Breen WG, Kowalchuk RO, Gunn HJ, Day CN, Moore EJ, Holton SJ, Van Abel KM, Abdel-Halim CN, Routman DM, Waddle MR. Accuracy of a Cancer Registry Versus Clinical Care Team Chart Abstraction in Identifying Cancer Recurrence. Mayo Clin Proc Innov Qual Outcomes. 2024 Jun; 8(3):225-231. Epub 2024 Apr 21.
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  12. Gao RW, Ma J, Pisansky TM, Kruse JJ, Stish BJ, Kowalchuk RO, McMenomy BP, Waddle MR, Phillips RM, Choo R, Davis BJ. Dosimetric Features of Ultra-Hypofractionated Intensity Modulated Proton Therapy for Prostate Cancer. Int J Part Ther. 2024 Jun; 12:100015 Epub 2024 Apr 24
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  13. Waters MR, Inkman M, Jayachandran K, Kowalchuk RM, Robinson C, Schwarz JK, Swamidass SJ, Griffith OL, Szymanski JJ, Zhang J. GAiN: An integrative tool utilizing generative adversarial neural networks for augmented gene expression analysis. Patterns (N Y). 2024 Feb 9; 5 (2):100910 Epub 2024 Jan 08
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  14. Pennington Z, Mikula AL, Lakomkin N, Martini M, Clarke MJ, Sebastian AS, Freedman BA, Rose PS, Karim SM, Nassr A, Bydon M, Kowalchuk RO, Merrell KW, Krauss WE, Fogelson JL, Elder BD. Comparison of Hounsfield units and vertebral bone quality score for the prediction of time to pathologic fracture in mobile spine metastases treated with radiotherapy. J Neurosurg Spine. 2024 Jan 1; 40 (1):19-27 Epub 2023 Oct 13
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  15. Breen WG, Young JR, Hathcock MA, Kowalchuk RO, Thorpe MP, Bansal R, Khurana A, Bennani NN, Paludo J, Bisneto JV, Wang Y, Ansell SM, Peterson JL, Johnston PB, Lester SC, Lin Y. Metabolic PET/CT analysis of aggressive Non-Hodgkin lymphoma prior to Axicabtagene Ciloleucel CAR-T infusion: predictors of progressive disease, survival, and toxicity. Blood Cancer J. 2023 Aug 18; 13 (1):127
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  16. Lehrer EJ, Kowalchuk RO, Gurewitz J, Bernstein K, Kondziolka D, Niranjan A, Wei Z, Lunsford LD, Fakhoury KR, Rusthoven CG, Mathieu D, Trudel C, Malouff TD, Ruiz-Garcia H, Bonney P, Hwang L, Yu C, Zada G, Patel S, Deibert CP, Picozzi P, Franzini A, Attuati L, Prasad RN, Raval RR, Palmer JD, Lee CC, Yang HC, Harmsen WS, Jones BM, Sharma S, Ahluwalia MS, Sheehan JP, Trifiletti DM. Concurrent Administration of Immune Checkpoint Inhibitors and Single Fraction Stereotactic Radiosurgery in Patients With Non-Small Cell Lung Cancer, Melanoma, and Renal Cell Carcinoma Brain Metastases. Int J Radiat Oncol Biol Phys. 2023 Jul 15; 116 (4):858-868 Epub 2023 Jan 21
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  17. Kowalchuk RO, Trifiletti DM, Brown PD, Sheehan JP. Contemporary radiotherapy and radiosurgery techniques for refractory pituitary adenomas. Pituitary. 2023 Jun; 26 (3):298-302 Epub 2023 Feb 17
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  18. Kowalchuk RO, Niranjan A, Hess J, Antonios JP, Zhang MY, Braunstein S, Ross RB, Pikis S, Deibert CP, Lee CC, Yang HC, Langlois AM, Mathieu D, Peker S, Samanci Y, Rusthoven CG, Chiang V, Wei Z, Lunsford LD, Trifiletti DM, Sheehan JP. Stereotactic radiosurgery and local control of brain metastases from triple-negative breast cancer. J Neurosurg. 2023 Jun 1; 138 (6):1608-1614 Epub 2022 Nov 25
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  19. Kowalchuk RO, Mullikin TC, Florez M, De BS, Spears GM, Rose PS, Siontis BL, Kim DK, Costello BA, Morris JM, Marion JT, Johnson-Tesch BA, Gao RW, Shiraishi S, Lucido JJ, Trifiletti DM, Olivier KR, Owen D, Stish BJ, Waddle MR, Laack NN, Park SS, Brown PD, Ghia AJ, Merrell KW. Development and validation of a recursive partitioning analysis-based pretreatment decision-making tool identifying ideal candidates for spine stereotactic body radiation therapy. Cancer. 2023 Mar 15; 129(6):956-965. Epub 2022 Dec 26.
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  20. Lehrer EJ, Kowalchuk RO, Trifiletti DM, Sheehan JP. The Role of Stereotactic Radiosurgery for Functioning and Nonfunctioning Pituitary Adenomas. Neurol India. 2023 Mar-Apr; 71 (Supplement):S133-S139
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  21. Allen AJ, Labella DA, Kowalchuk RO, Waters MR, Kersh CR. Effect of histology on stereotactic body radiotherapy for non-small cell lung cancer oligometastatic pulmonary lesions. Transl Lung Cancer Res. 2023 Jan 31; 12 (1):66-78 Epub 2023 Jan 16
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  22. Kowalchuk R, Mullikin TC, Breen W, Gits HC, Florez M, De B, Harmsen WS, Rose PS, Siontis BL, Costello BA, Morris JM, Lucido JJ, Olivier KR, Stish B, Laack NN, Park S, Owen D, Ghia AJ, Brown PD, Merrell KW. Development and validation of a unifying pre-treatment decision tool for intracranial and extracranial metastasis-directed radiotherapy. Front Oncol. 2023; 13:1095170. Epub 2023 Mar 27.
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  23. Kowalchuk RO, Spears GM, Morris LK, Owen D, Yoon HH, Jethwa K, Chuong MD, Ferris MJ, Haddock MG, Hallemeier CL, Wigle D, Lin SH, Merrell KW. Risk stratification of postoperative cardiopulmonary toxicity after trimodality therapy for esophageal cancer. Front Oncol. 2023; 13:1081024 Epub 2023 Feb 09
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  24. Kowalchuk RO, Kim H, Harmsen WS, Jeans EB, Morris LK, Mullikin TC, Miller RC, Wong WW, Vargas CE, Trifiletti DM, Phillips RM, Choo CR, Davis BJ, Beriwal S, Tendulkar RD, Stish BJ, Breen WG, Waddle MR. Cost effectiveness of treatment strategies for high risk prostate cancer. Cancer. 2022 Nov 1; 128 (21):3815-3823 Epub 2022 Sept 07
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  25. Mikula AL, Pennington Z, Lakomkin N, Clarke MJ, Rose PS, Bydon M, Freedman B, Sebastian AS, Lu L, Kowalchuk RO, Merrell KW, Fogelson JL, Elder BD. Independent predictors of vertebral compression fracture following radiation for metastatic spine disease. J Neurosurg Spine. 2022 Oct 1; 37 (4):617-623 Epub 2022 Apr 15
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  26. Moassefi M, Faghani S, Conte GM, Kowalchuk RO, Vahdati S, Crompton DJ, Perez-Vega C, Cabreja RAD, Vora SA, Quiñones-Hinojosa A, Parney IF, Trifiletti DM, Erickson BJ. A deep learning model for discriminating true progression from pseudoprogression in glioblastoma patients. J Neurooncol. 2022 Sep; 159(2):447-455. Epub 2022 Jul 19.
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  27. Zhu Z, Ni J, Cai X, Su S, Zhuang H, Yang Z, Chen M, Ma S, Xie C, Xu Y, Li J, Ge H, Liu A, Zhao L, Rao C, Xie C, Bi N, Hui Z, Zhu G, Yuan Z, Wang J, Zhao L, Zhou W, Rim CH, Navarro-Martin A, Vanneste BGL, Ruysscher D, Choi JI, Jassem J, Chang JY, Kepka L, Kasmann L, Milano MT, Van Houtte P, Suwinski R, Traverso A, Doi H, Suh YG, Noel G, Tomita N, Kowalchuk RO, Sio TT, Li B, Lu B, Fu X. International consensus on radiotherapy in metastatic non-small cell lung cancer. Transl Lung Cancer Res. 2022 Sep; 11 (9):1763-1795
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  28. Kowalchuk RO, Van Abel KM, Sauer AB, Yin LX, Garcia JJ, Harmsen WS, Moore EJ, Price DL, Chintakuntlawar AV, Price KR, Lester SC, Wittich MN, Patel SH, Foote RL, Ma DM, Nagelschneider AA, Routman DM. The Number of Radiographically Positive Lymph Nodes Further Stratifies Patient Survival Among Clinical N1 Patients With Human Papillomavirus-Associated Oropharyngeal Cancer. Adv Radiat Oncol. 2022 Jul-Aug; 7 (4):100926 Epub 2022 Feb 23
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  29. Breen WG, Hathcock MA, Young JR, Kowalchuk RO, Bansal R, Khurana A, Bennani NN, Paludo J, Villasboas Bisneto JC, Wang Y, Ansell SM, Peterson JL, Johnston PB, Lester SC, Lin Y. Metabolic characteristics and prognostic differentiation of aggressive lymphoma using one-month post-CAR-T FDG PET/CT. J Hematol Oncol 2022 Mar 26; 15 (1):36
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  30. Kowalchuk RO, Johnson-Tesch BA, Marion JT, Mullikin TC, Harmsen WS, Rose PS, Siontis BL, Kim DK, Costello BA, Morris JM, Gao RW, Shiraishi S, Lucido JJ, Sio TT, Trifiletti DM, Olivier KR, Owen D, Stish BJ, Waddle MR, Laack NN, Park SS, Brown PD, Merrell KW. Development and Assessment of a Predictive Score for Vertebral Compression Fracture After Stereotactic Body Radiation Therapy for Spinal Metastases. JAMA Oncol. 2022 Mar 01; 8(3):412-419.
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  31. Kowalchuk RO, Niranjan A, Lee CC, Yang HC, Liscak R, Guseynova K, Tripathi M, Kumar N, Peker S, Samanci Y, Hess J, Chiang V, Iorio-Morin C, Mathieu D, Pikis S, Wei Z, Lunsford LD, Trifiletti DM, Sheehan JP. Reirradiation With Stereotactic Radiosurgery After Local or Marginal Recurrence of Brain Metastases From Previous Radiosurgery. Int J Radiat Oncol Biol Phys. 2022 Mar 1; 112 (3):726-734 Epub 2021 Oct 10
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  32. Kowalchuk RO, Corbin KS, Jimenez RB. Particle Therapy for Breast Cancer. Cancers (Basel). 2022 Feb 20; 14 (4)
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  33. Yan Y, Fu J, Kowalchuk RO, Wright CM, Zhang R, Li X, Xu Y. Exploration of radiation-induced lung injury, from mechanism to treatment: a narrative review. Transl Lung Cancer Res. 2022 Feb; 11 (2):307-322
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  34. Kowalchuk RO, Kamdem Talom BC, Van Abel KM, Ma DM, Waddle MR, Routman DM. Estimated Cost of Circulating Tumor DNA for Posttreatment Surveillance of Human Papillomavirus-Associated Oropharyngeal Cancer. JAMA Netw Open. 2022 Jan 4; 5 (1):e2144783 Epub 2022 Jan 04
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  35. Kowalchuk RO, Mullikin TC, Harmsen WS, Rose PS, Siontis BL, Kim DK, Costello BA, Morris JM, Marion JT, Johnson-Tesch BA, Gao RW, Shiraishi S, Lucido JJ, Olivier KR, Owen D, Stish BJ, Laack NN, Park SS, Brown PD, Merrell KW. Development and Internal Validation of a Recursive Partitioning Analysis-Based Model Predictive of Pain Flare Incidence After Spine Stereotactic Body Radiation Therapy. Pract Radiat Oncol. 2022 Jul-Aug; 12(4):e269-e277. Epub 2022 Feb 10.
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  36. Kowalchuk RO, Mullikin TC, Kim DK, Morris JM, Ebner DK, Harmsen WS, Merrell KW, Beriwal S, Waddle MR, Kim H. Cost-Effectiveness of Treatment Strategies for Spinal Metastases. Pract Radiat Oncol. 2022 May-Jun; 12(3):236-244. Epub 2022 Jan 16.
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  37. Akinduro OO, De Biase G, Goyal A, Meyer JH, Sandhu SJS, Kowalchuk RO, Trifiletti DM, Sheehan J, Merrell KW, Vora SA, Broderick DF, Clarke MJ, Bydon M, McClendon J Jr, Kalani MA, Quiñones-Hinojosa A, Abode-Iyamah K. Focused versus conventional radiotherapy in spinal oncology: is there any difference in fusion rates and pseudoarthrosis? J Neurooncol. 2022 Jan; 156(2):329-339. Epub 2022 Jan 07.
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  38. Lucido JJ, Mullikin TC, Abraha F, Harmsen WS, Vaishnav BD, Brinkmann DH, Kowalchuk RO, Marion JT, Johnson-Tesch BA, El Sherif O, Brown PD, Rose PS, Owen D, Morris JM, Waddle MR, Siontis BL, Stish BJ, Pafundi DH, Laack NN, Olivier KR, Park SS, Merrell KW. Single and Multifraction Spine Stereotactic Body Radiation Therapy and the Risk of Radiation Induced Myelopathy. Adv Radiat Oncol. 2022 Nov-Dec; 7(6):101047. Epub 2022 Aug 13.
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  39. Lehrer EJ, Kowalchuk RO, Ruiz-Garcia H, Merrell KW, Brown PD, Palmer JD, Burri SH, Sheehan JP, Quninoes-Hinojosa A, Trifiletti DM. Preoperative stereotactic radiosurgery in the management of brain metastases and gliomas. Front Surg. 2022; 9:972727 Epub 2022 Oct 24
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  40. Liu L, He L, Li W, Zhao T, Li G, Xiu X, Xu Y, Bourbonne V, Kasmann L, Kowalchuk RO, Zhong Q. The miR-4306/IGF2R axis modulates the lung adenocarcinoma response to irradiation in vitro and in vivo. Transl Lung Cancer Res. 2021 Dec; 10 (12):4494-4510
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  41. Kowalchuk RO, Van Abel KM, Yin LX, Garcia J, Harmsen WS, Moore EJ, Price DL, Chintakuntlawar AV, Price KR, Lester SC, Neben Wittich M, Patel SH, Foote RL, Ma DM, Nagelschneider AA, Routman DM. Correlation between radiographic and pathologic lymph node involvement and extranodal extension via CT and PET in HPV-associated oropharyngeal cancer. Oral Oncol. 2021 Dec; 123:105625 Epub 2021 Nov 20
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  42. Kowalchuk RO, Hillman D, Daniels TB, Vargas CE, Rwigema JM, Wong WW, Stish BJ, Dueck AC, Choo R. Assessing concordance between patient-reported and investigator-reported CTCAE after proton beam therapy for prostate cancer. Clin Transl Radiat Oncol. 2021 Nov; 31:34-41 Epub 2021 Sept 15
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  43. Gits HC, Tang AH, Harmsen WS, Bamlet WR, Graham RP, Petersen GM, Smyrk TC, Mahipal A, Kowalchuk RO, Ashman JB, Rule WG, Owen D, Neben Wittich MA, McWilliams RR, Halfdanarson T, Ma WW, Sio TT, Cleary SP, Truty MJ, Haddock MG, Hallemeier CL, Merrell KW. Intact SMAD-4 is a predictor of increased locoregional recurrence in upfront resected pancreas cancer receiving adjuvant therapy. J Gastrointest Oncol. 2021 Oct; 12 (5):2275-2286
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  44. Kowalchuk RO, Shepard MJ, Sheehan K, Sheehan D, Faramand A, Niranjan A, Kano H, Gurewitz J, Bernstein K, Liscak R, Guseynova K, Grills IS, Parzen JS, Cifarelli CP, Rehman AA, Atik A, Bakhsheshian J, Zada G, Chang E, Giannotta S, Speckter H, Wu HM, Kondziolka D, Mathieu D, Lee CC, Warnick RE, Lunsford LD, Trifiletti DM, Sheehan JP. Treatment of WHO Grade 2 Meningiomas With Stereotactic Radiosurgery: Identification of an Optimal Group for SRS Using RPA. Int J Radiat Oncol Biol Phys. 2021 Jul 1; 110 (3):804-814 Epub 2021 Feb 03
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  45. Kowalchuk RO, Waters MR, Dutta SW, Mack ML, Richardson KM, Spencer K, Romano KD, Larner JM, Sheehan JP, Kersh CR. Recursive Partitioning Analysis for Local Control Achieved With Stereotactic Body Radiation Therapy for the Liver, Spine, or Lymph Nodes. Adv Radiat Oncol. 2021 May-Jun; 6 (3):100612 Epub 2020 Nov 10
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  46. Kowalchuk RO, Waters MR, Richardson KM, Spencer KM, Larner JM, Kersh CR. A single institutional experience with central lung stereotactic body radiation therapy demonstrating encouraging results with increased inter-fraction time. J Thorac Dis. 2021 Feb; 13 (2):642-652
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  47. Kowalchuk RO, Cousins D, Spencer KM, Richardson KM, Larner JM, Showalter TN, McAllister WH, Sheehan JP, Kersh CR, Dutta SW. Local control of 1-5 fraction radiotherapy regimens for spinal metastases: an analysis of the impacts of biologically effective dose and primary histology. Rep Pract Oncol Radiother. 2021; 26 (6):883-891 Epub 2021 Dec 30
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  48. Kowalchuk RO, Lester SC, Graham RP, Harmsen WS, Zhang L, Halfdanarson TR, Smoot RL, Gits HC, Ma WW, Owen D, Mahipal A, Miller RC, Wittich MAN, Cleary SP, McWilliams RR, Haddock MG, Hallemeier CL, Truty MJ, Merrell KW. Predicting Adverse Pathologic Features and Clinical Outcomes of Resectable Pancreas Cancer With Preoperative CA 19-9. Front Oncol. 2021; 11:651119 Epub 2021 May 11
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  49. Kowalchuk RO, Waters MR, Richardson KM, Spencer KM, Larner JM, Kersh CR. Stereotactic Body Radiation Therapy for Salvage Treatment of Recurrent Non-Small Cell Lung Cancer. Pract Radiat Oncol. 2020 Nov-Dec; 10 (6):e475-e484 Epub 2020 May 23
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  50. Kowalchuk RO, Waters MR, Richardson KM, Spencer KM, Larner JM, Kersh CR. A single-institutional experience with low dose stereotactic body radiation therapy for liver metastases. Rep Pract Oncol Radiother. 2020 Nov-Dec; 25 (6):987-993 Epub 2020 Oct 02
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  51. Kowalchuk RO, Waters MR, Richardson KM, Spencer K, Larner JM, McAllister WH, Sheehan JP, Kersh CR. Stereotactic body radiation therapy for spinal metastases: a novel local control stratification by spinal region. J Neurosurg Spine. 2020 Oct 23; 34 (2):267-276
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  52. Kowalchuk RO, Waters MR, Baliga S, Richardson KM, Spencer KM, Larner JM, Kersh CR. Stereotactic body radiation therapy for empirically treated hypermetabolic lung lesions: a single-institutional experience identifying the Charlson score as a key prognostic factor. Transl Lung Cancer Res. 2020 Oct; 9 (5):1862-1872
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  53. Kowalchuk RO, Waters MR, Richardson M, Spencer K, Larner JM, Kersh CR. Low-dose hilar and mediastinal stereotactic body radiation therapy for non-small cell lung cancer: Analysis of outcomes in patients receiving one or multiple courses of treatment. Thorac Cancer. 2020.
  54. Kowalchuk RO, Waters MR, Richardson KM, Spencer KM, Larner JM, Sheehan JP, McAllister WH, Kersh CR. Stereotactic radiosurgery for the treatment of bulky spine metastases. J Neurooncol. 2020 Jun; 148 (2):381-388 Epub 2020 May 15
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  55. Kowalchuk RO, Waters MR, Richardson KM, Spencer K, Larner JM, Irvin WP, Kersh CR. Stereotactic body radiation therapy in the treatment of ovarian cancer. Radiat Oncol. 2020 May 13; 15 (1):108
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  56. Schad M, Kowalchuk R, Beriwal S, Showalter TN. How might financial pressures have impacted brachytherapy? A proposed narrative to explain the declines in cervical and prostate brachytherapy utilization. Brachytherapy. 2019 Nov-Dec; 18 (6):780-786 Epub 2019 Aug 19
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  57. Kowalchuk RO, Kowalchuk RM, Kaplan-List K. Spontaneous left atrial intramural hematoma with cystic degeneration. Applied Radiology. 2019.
  58. Kowalchuk RO, Trifiletti DM, Khandelwal S, Larner J, Watkins W. A Risk Model for Lung Complication Combining Radiation Therapy and Chronic Obstructive Pulmonary Disease Journal of Radiation Oncology. 2019.
  59. Dutta SW, Kowalchuk RO, Trifiletti DM, Peach MS, Sheehan JP, Larner JM, Schlesinger D. Stereotactic Shifts During Frame-Based Image-Guided Stereotactic Radiosurgery: Clinical Measurements. Int J Radiat Oncol Biol Phys. 2018 Nov 15; 102(4):895-902. Epub 2018 May 24.
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  60. Kowalchuk RM, Kowalchuk RO, Kaplan-List K, Caplash JM, Block P. Temporomandibular Joint Internal Derangement Score (TIDS): novel magnetic resonance imaging assessment score and its relation to invasive treatment in patients with clinical temporomandibular joint pathology. Heliyon. 2018 Nov; 4 (11):e00916 Epub 2018 Nov 11
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  61. Kowalchuk RO, Kowalchuk RM, Kaplan-List K, Oates TK, Smith SC. Symptomatic cholelithiasis in an ectopic retrocolic retroduodenal subhepatic duplicated gallbladder. Radiol Case Rep. 2018 Aug; 13 (4):904-908 Epub 2018 July 05
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  62. Kowalchuk RO, Romano KD, Trifiletti DM, Dutta SW, Showalter TN, Morris MM. Preliminary toxicity results using partial breast 3D-CRT with once daily hypo-fractionation and deep inspiratory breath hold Radiation Oncology. 2018.