

Professional Summary
Education & Certifications
- Internship: Santa Clara Valley Medical Center (2000) CA
- Residency: Stanford University Radiation Oncology Residency (2004) CA
- Board Certification: American Board of Radiology, Radiation Oncology (2005)
- Medical Education: Stanford University School of Medicine (1999) CA
Publications
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Predictors of local recurrence after breast-conservation therapy.
Horst, K. C., Smitt, M. C., Goffinet, D. R., & Carlson, R. W. (2005). Predictors of local recurrence after breast-conservation therapy. Clinical Breast Cancer, 5(6), 425–38. -
Pathologic correlates of false positive breast magnetic resonance imaging findings: which lesions warrant biopsy?
Langer, S. A., Horst, K. C., Ikeda, D. M., Daniel, B. L., Kong, C. S., & Dirbas, F. M. (2005). Pathologic correlates of false positive breast magnetic resonance imaging findings: which lesions warrant biopsy? AMERICAN JOURNAL OF SURGERY. LOS ANGELES,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA,CA: EXCERPTA MEDICA INC-ELSEVIER SCIENCE INC. -
Association of clinical and pathologic variables with lumpectomy surgical margin status after preoperative diagnosis or excisional biopsy of invasive breast cancer
Smitt, M. C., & Horst, K. (2007). Association of clinical and pathologic variables with lumpectomy surgical margin status after preoperative diagnosis or excisional biopsy of invasive breast cancer. ANNALS OF SURGICAL ONCOLOGY, 14(3), 1040–44. -
Phyllodes tumors of the breast: natural history, diagnosis, and treatment.
Telli, M. L., Horst, K. C., Guardino, A. E., Dirbas, F. M., & Carlson, R. W. (2007). Phyllodes tumors of the breast: natural history, diagnosis, and treatment. Journal of the National Comprehensive Cancer Network , 5(3), 324–30. -
Impact of increasing margin around the lumpectomy cavity to define the planning target volume for 3d conformal external beam accelerated partial breast irradiation
Cox, B. W., Horst, K. C., Thornton, S., & Dirbas, F. M. (2007). Impact of increasing margin around the lumpectomy cavity to define the planning target volume for 3d conformal external beam accelerated partial breast irradiation. MEDICAL DOSIMETRY, 32(4), 254–62. -
MRI GUIDANCE FOR ACCELERATED PARTIAL BREAST IRRADIATION IN PRONE POSITION: IMAGING PROTOCOL DESIGN AND EVALUATION
Ahn, K.-H., Hargreaves, B. A., Alley, M. T., Horst, K. C., Luxton, G., Daniel, B. L., & Hristov, D. (2009). MRI GUIDANCE FOR ACCELERATED PARTIAL BREAST IRRADIATION IN PRONE POSITION: IMAGING PROTOCOL DESIGN AND EVALUATION. INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS. BOSTON,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA,MA: ELSEVIER SCIENCE INC. -
ACR Appropriateness Criteria (R) Conservative surgery and Radiation - Stage I and II Breast Carcinoma
Bellon, J. R., Harris, E. E. R., Arthur, D. W., Bailey, L., Carey, L., Goyal, S., … Haffty, B. G. (2011). ACR Appropriateness Criteria (R) Conservative surgery and Radiation - Stage I and II Breast Carcinoma. BREAST JOURNAL, 17(5), 448–55. -
ACR Appropriateness Criteria (R) Locally Advanced Breast Cancer
MacDonald, S. M., Harris, E. E. R., Arthur, D. W., Bailey, L., Bellon, J. R., Carey, L., … Haffty, B. G. (2011). ACR Appropriateness Criteria (R) Locally Advanced Breast Cancer. BREAST JOURNAL, 17(6), 579–85. -
ACR Appropriateness Criteria (R) Ductal Carcinoma in Situ
Moran, M. S., Bai, H. X., Harris, E. E. R., Arthur, D. W., Bailey, L., Bellon, J. R., … Haffty, B. G. (2012). ACR Appropriateness Criteria (R) Ductal Carcinoma in Situ. BREAST JOURNAL, 18(1), 8–15. -
Evolving trends in the initial locoregional management of male breast cancer
Bratman, S. V., Kapp, D. S., & Horst, K. C. (2012). Evolving trends in the initial locoregional management of male breast cancer. BREAST, 21(3), 296–302. -
ACR Appropriateness Criterias (R) Local-regional Recurrence (LR) and Salvage Surgery Breast Cancer
Halyard, M. Y., Wasif, N., Harris, E. E. R., Arthur, D. W., Bailey, L., Bellon, J. R., … Haffty, B. G. (2012). ACR Appropriateness Criterias (R) Local-regional Recurrence (LR) and Salvage Surgery Breast Cancer. AMERICAN JOURNAL OF CLINICAL ONCOLOGY-CANCER CLINICAL TRIALS, 35(2), 178–82. -
Breast magnetic resonance imaging alters patient selection for accelerated partial breast irradiation.
Horst, K. C., Ikeda, D. M., Fero, K. E., Daniel, B. L., Goffinet, D. R., & Dirbas, F. M. (2014). Breast magnetic resonance imaging alters patient selection for accelerated partial breast irradiation. American Journal of Clinical Oncology, 37(3), 248–54. -
Defining an optimal role for breast magnetic resonance imaging when evaluating patients otherwise eligible for accelerated partial breast irradiation.
Horst, K. C., Fero, K. E., Ikeda, D. M., Daniel, B. L., & Dirbas, F. M. (2013). Defining an optimal role for breast magnetic resonance imaging when evaluating patients otherwise eligible for accelerated partial breast irradiation. Radiotherapy and Oncology , 108(2), 220–25. -
Predictors of Re-excision Findings and Ipsilateral Breast Tumor Recurrence after Breast Conservation Therapy
Predictors of Re-excision Findings and Ipsilateral Breast Tumor Recurrence after Breast Conservation Therapy. (2004). Current Medical Literature, 16(4). -
Intraoperative Radiotherapy following Lumpectomy for Breast Cancer
Intraoperative Radiotherapy following Lumpectomy for Breast Cancer. (2007). Semin Breast Dis, 10. -
Association of Clinical and Pathologic Variables with Lumpectomy Surgical Margin Status after Preoperative Diagnosis or Excisional Biopsy of Invasive Breast Cancer
Association of Clinical and Pathologic Variables with Lumpectomy Surgical Margin Status after Preoperative Diagnosis or Excisional Biopsy of Invasive Breast Cancer. (2007). Ann Surg Oncol, 14(3). -
Trajectory modulated prone breast irradiation: A LINAC-based technique combining intensity modulated delivery and motion of the couch
Fahimian, B., Yu, V., Horst, K., Xing, L., & Hristov, D. (2013). Trajectory modulated prone breast irradiation: A LINAC-based technique combining intensity modulated delivery and motion of the couch. RADIOTHERAPY AND ONCOLOGY, 109(3), 475–81. -
Breast Cancer Treatment Across Health Care Systems
Kurian, A. W., Mitani, A., Desai, M., Yu, P. P., Seto, T., Weber, S. C., … Das, A. K. (2014). Breast Cancer Treatment Across Health Care Systems. CANCER, 120(1), 103–11. -
Breast cancer treatment across health care systems: linking electronic medical records and state registry data to enable outcomes research.
Kurian, A. W., Mitani, A., Desai, M., Yu, P. P., Seto, T., Weber, S. C., … Das, A. K. (2014). Breast cancer treatment across health care systems: linking electronic medical records and state registry data to enable outcomes research. Cancer, 120(1), 103–11. -
Nonisocentric treatment strategy for breast radiation therapy: a proof of concept study.
Li, R., Xing, L., Horst, K. C., & Bush, K. (2014). Nonisocentric treatment strategy for breast radiation therapy: a proof of concept study. International Journal of Radiation Oncology, Biology, Physics, 88(4), 920–26. -
Nonisocentric treatment strategy for breast radiation therapy: a proof of concept study.
Li, R., Xing, L., Horst, K. C., & Bush, K. (2014). Nonisocentric treatment strategy for breast radiation therapy: a proof of concept study. International Journal of Radiation Oncology, Biology, Physics, 88(4), 920–26. -
ACR Appropriateness Criteria (R) Local-Regional Recurrence (LRR) and Salvage Surgery-Breast Cancer
Halyard, M. Y., Harris, E. E. R., Bailey, L., Freedman, G. M., Goyal, S., Horst, K. C., … Haffty, B. G. (2014). ACR Appropriateness Criteria (R) Local-Regional Recurrence (LRR) and Salvage Surgery-Breast Cancer. ONCOLOGY-NEW YORK, 28(2), 157-? -
Histologic subtypes of breast cancer following radiotherapy for Hodgkin lymphoma.
Horst, K. C., Hancock, S. L., OGNIBENE, G., Chen, C., Advani, R. H., Rosenberg, S. A., … Hoppe, R. T. (2014). Histologic subtypes of breast cancer following radiotherapy for Hodgkin lymphoma. Annals of Oncology , 25(4), 848–51. -
Breast Magnetic Resonance Imaging Alters Patient Selection for Accelerated Partial Breast Irradiation
Horst, K. C., Ikeda, D. M., Fero, K. E., Daniel, B. L., Goffinet, D. R., & Dirbas, F. M. (2014). Breast Magnetic Resonance Imaging Alters Patient Selection for Accelerated Partial Breast Irradiation. AMERICAN JOURNAL OF CLINICAL ONCOLOGY-CANCER CLINICAL TRIALS, 37(3), 248–54. -
Solid Malignancies in Individuals With Down Syndrome: A Case Presentation and Literature Review
Bratman, S. V., Horst, K. C., Carlson, R. W., & Kapp, D. S. (2014). Solid Malignancies in Individuals With Down Syndrome: A Case Presentation and Literature Review. JOURNAL OF THE NATIONAL COMPREHENSIVE CANCER NETWORK, 12(11), 1537–45. -
ACR Appropriateness Criteria (R) Ductal Carcinoma in Situ
Kaufman, S. A., Harris, E. E. R., Bailey, L., Chadha, M., Dutton, S. C., Freedman, G. M., … Haffty, B. G. (2015). ACR Appropriateness Criteria (R) Ductal Carcinoma in Situ. ONCOLOGY-NEW YORK, 29(6), 446-? -
Trajectory Modulated Arc Therapy: A Fully Dynamic Delivery With Synchronized Couch and Gantry Motion Significantly Improves Dosimetric Indices Correlated With Poor Cosmesis in Accelerated Partial Breast Irradiation
Liang, J., Atwood, T., von Eyben, R., Fahimian, B., Chin, E., Horst, K., … Hristov, D. (2015). Trajectory Modulated Arc Therapy: A Fully Dynamic Delivery With Synchronized Couch and Gantry Motion Significantly Improves Dosimetric Indices Correlated With Poor Cosmesis in Accelerated Partial Breast Irradiation. INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS, 92(5), 1148–56. -
Cost-Effectiveness of Pertuzumab in Human Epidermal Growth Factor Receptor 2-Positive Metastatic Breast Cancer.
Durkee, B. Y., Qian, Y., Pollom, E. L., King, M. T., Dudley, S. A., Shaffer, J. L., … Horst, K. C. (2016). Cost-Effectiveness of Pertuzumab in Human Epidermal Growth Factor Receptor 2-Positive Metastatic Breast Cancer. Journal of Clinical Oncology , 34(9), 902–9. -
Solid malignancies in individuals with Down syndrome: a case presentation and literature review.
Bratman, S. V., Horst, K. C., Carlson, R. W., & Kapp, D. S. (2014). Solid malignancies in individuals with Down syndrome: a case presentation and literature review. Journal of the National Comprehensive Cancer Network , 12(11), 1537–45. -
Breast Imaging in Women Previously Irradiated for Hodgkin Lymphoma.
Horst, K. C., Fero, K. E., Hancock, S. L., Advani, R. H., Ikeda, D. M., Daniel, B., … Hoppe, R. T. (2016). Breast Imaging in Women Previously Irradiated for Hodgkin Lymphoma. American Journal of Clinical Oncology, 39(2), 114–19. -
Impact of a Sit-Stand Workstation on Chronic Low Back Pain: Results of a Randomized Trial.
Ognibene, G. T., Torres, W., von Eyben, R., & Horst, K. C. (2016). Impact of a Sit-Stand Workstation on Chronic Low Back Pain: Results of a Randomized Trial. Journal of Occupational and Environmental Medicine , 58(3), 287–93. -
Five-year results of a prospective clinical trial investigating accelerated partial breast irradiation using 3D conformal radiotherapy after lumpectomy for early stage breast cancer
Horst, K. C., Fasola, C., Ikeda, D., Daniel, B., Ognibene, G., Goffinet, D. R., & Dirbas, F. M. (2016). Five-year results of a prospective clinical trial investigating accelerated partial breast irradiation using 3D conformal radiotherapy after lumpectomy for early stage breast cancer. BREAST, 28, 178–83. -
CT-Guided Wire Localization for Involved Axillary Lymph Nodes After Neo-adjuvant Chemotherapy in Patients With Initially Node-Positive Breast Cancer
Long Trinh, L., Miyake, K. K., Dirbas, F. M., Kothary, N., Horst, K. C., Lipson, J. A., … Ikeda, D. M. (2016). CT-Guided Wire Localization for Involved Axillary Lymph Nodes After Neo-adjuvant Chemotherapy in Patients With Initially Node-Positive Breast Cancer. BREAST JOURNAL, 22(4), 390–96. -
Reply to R. Colomer et al.
Durkee, B. Y., Qian, Y., Goldhaber-Fiebert, J. D., & Horst, K. C. (2016). Reply to R. Colomer et al. Journal of Clinical Oncology , 34(26), 3227–28. -
Clinical Utility of the 12-Gene DCIS Score Assay: Impact on Radiotherapy Recommendations for Patients with Ductal Carcinoma In Situ.
Manders, J. B., Kuerer, H. M., Smith, B. D., McCluskey, C., Farrar, W. B., Frazier, T. G., … White, J. (2016). Clinical Utility of the 12-Gene DCIS Score Assay: Impact on Radiotherapy Recommendations for Patients with Ductal Carcinoma In Situ. Annals of Surgical Oncology, -? -
Clinical Utility of the 12-Gene DCIS Score Assay: Impact on Radiotherapy Recommendations for Patients with Ductal Carcinoma In Situ
Manders, J. B., Kuerer, H. M., Smith, B. D., McCluskey, C., Farrar, W. B., Frazier, T. G., … White, J. (2017). Clinical Utility of the 12-Gene DCIS Score Assay: Impact on Radiotherapy Recommendations for Patients with Ductal Carcinoma In Situ. ANNALS OF SURGICAL ONCOLOGY, 24(3), 660–68. -
Will oncotype DX DCIS testing guide therapy? A single-institution correlation of oncotype DX DCIS results with histopathologic findings and clinical management decisions.
Lin, C.-Y. Y., Mooney, K., Choy, W., Yang, S.-R. R., Barry-Holson, K., Horst, K., … Allison, K. (2017). Will oncotype DX DCIS testing guide therapy? A single-institution correlation of oncotype DX DCIS results with histopathologic findings and clinical management decisions. Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc. -
Higher Absolute Lymphocyte Counts Predict Lower Mortality from Early-Stage Triple-Negative Breast Cancer.
Afghahi, A., Purington, N., Han, S. S., Desai, M., Pierson, E., Mathur, M. B., … Kurian, A. W. (2018). Higher Absolute Lymphocyte Counts Predict Lower Mortality from Early-Stage Triple-Negative Breast Cancer. Clinical Cancer Research : an Official Journal of the American Association for Cancer Research. -
Impact of Insurance Coverage on Outcomes in Primary Breast Sarcoma.
Koenig, J. L., Tsai, C. J., Sborov, K., Horst, K. C., & Pollom, E. L. (2018). Impact of Insurance Coverage on Outcomes in Primary Breast Sarcoma. Sarcoma, 2018, 4626174. -
National trends in mastectomy for operable breast cancers treated with neoadjuvant chemotherapy
Pollom, E., Qian, Y., Dirbas, F., Horst, K., & Tsai, C. J. (2018). National trends in mastectomy for operable breast cancers treated with neoadjuvant chemotherapy. CANCER RESEARCH. AMER ASSOC CANCER RESEARCH. -
Accelerated, Partial Breast Irradiation Overview
Wheeler, A. J., Dirbas, F. M., & Horst, K. C. (2011). Accelerated, Partial Breast Irradiation Overview. BREAST SURGICAL TECHNIQUES AND INTERDISCIPLINARY MANAGEMENT, 829–36. -
Accelerated, Partial Breast Irradiation with Intraoperative Radiotherapy
Baynosa, J., Horst, K. C., & Dirbas, F. M. (2011). Accelerated, Partial Breast Irradiation with Intraoperative Radiotherapy. BREAST SURGICAL TECHNIQUES AND INTERDISCIPLINARY MANAGEMENT, 883–97. -
Breast Imaging Following Breast Conservation Therapy
Gutierrez, R., Horst, K. C., Dirbas, F. M., & Ikeda, D. M. (2011). Breast Imaging Following Breast Conservation Therapy. BREAST SURGICAL TECHNIQUES AND INTERDISCIPLINARY MANAGEMENT, 975–95. -
Patterns of Distant Failure by Intrinsic Breast Cancer Subtype in Premenopausal Women Treated With Neoadjuvant Chemotherapy.
Kozak, M. M., Jacobson, C. E., von Eyben, R., Walck, E., Pollom, E. L., Telli, M., & Horst, K. C. (2018). Patterns of Distant Failure by Intrinsic Breast Cancer Subtype in Premenopausal Women Treated With Neoadjuvant Chemotherapy. Clinical Breast Cancer. -
Fractionation of palliative radiotherapy in metastatic breast cancer: Selection and survival
Qian, Y., Dudley, S., Durkee, B. Y., Kumar, K., Chaudhuri, A., Pollom, E. L., … Chang, D. T. (2015). Fractionation of palliative radiotherapy in metastatic breast cancer: Selection and survival. JOURNAL OF CLINICAL ONCOLOGY. AMER SOC CLINICAL ONCOLOGY. -
Macrophages Promote Circulating Tumor Cell-Mediated Local Recurrence Following Radiation Therapy in Immunosuppressed Patients.
Rafat, M., Aguilera, T. A., Vilalta, M., Bronsart, L. L., Soto, L. A., von Eyben, R., … Graves, E. E. (2018). Macrophages Promote Circulating Tumor Cell-Mediated Local Recurrence Following Radiation Therapy in Immunosuppressed Patients. Cancer Research. -
Radiation therapy for the whole breast: Executive summary of an American Society for Radiation Oncology (ASTRO) evidence-based guideline
Smith, B. D., Bellon, J. R., Blitzblau, R., Freedman, G., Haffty, B., Hahn, C., … Jagsi, R. (2018). Radiation therapy for the whole breast: Executive summary of an American Society for Radiation Oncology (ASTRO) evidence-based guideline. PRACTICAL RADIATION ONCOLOGY, 8(3), 145–52. -
Detection of local recurrence in premenopausal patients treated with neoadjuvant chemotherapy and mastectomy with or without breast reconstruction
Jacobson, C. E., Kozak, M., Walck, E., Hawley, E., & Horst, K. (2018). Detection of local recurrence in premenopausal patients treated with neoadjuvant chemotherapy and mastectomy with or without breast reconstruction. CANCER RESEARCH, 78(4). -
Characteristics and clinical outcomes of pleomorphic lobular carcinoma in situ of the breast
Fasola, C. E., Chen, J. J., Jensen, K. C., Allison, K. H., & Horst, K. C. (2018). Characteristics and clinical outcomes of pleomorphic lobular carcinoma in situ of the breast. BREAST JOURNAL, 24(1), 66–69. -
Integrating Radiosensitivity and Immune Gene Signatures for Predicting Benefit of Radiotherapy in Breast Cancer.
Cui, Y., Li, B., Pollom, E. L., Horst, K., & Li, R. (2018). Integrating Radiosensitivity and Immune Gene Signatures for Predicting Benefit of Radiotherapy in Breast Cancer. Clinical Cancer Research : an Official Journal of the American Association for Cancer Research. -
Rising rates of bilateral mastectomy with reconstruction following neoadjuvant chemotherapy.
Pollom, E. L., Qian, Y., Chin, A. L., Dirbas, F. M., Asch, S. M., Kurian, A. W., … Tsai, C. J. (2018). Rising rates of bilateral mastectomy with reconstruction following neoadjuvant chemotherapy. International Journal of Cancer. -
Outcomes Following Neoadjuvant Chemotherapy for Breast Cancer in Women Aged 40 Years and Younger: Impact of Pathologic Nodal Response.
Kozak, M. M., Jacobson, C. E., von Eyben, R., Pollom, E. L., Telli, M., & Horst, K. C. (2018). Outcomes Following Neoadjuvant Chemotherapy for Breast Cancer in Women Aged 40 Years and Younger: Impact of Pathologic Nodal Response. Journal of the National Comprehensive Cancer Network : JNCCN, 16(7), 845–50. -
Clinical perineural invasion of cutaneous head and neck cancer: Impact of radiotherapy, imaging, and nerve growth factor receptors on symptom control and prognosis.
Chen, J. J., Harris, J. P., Kong, C. S., Sunwoo, J. B., Divi, V., Horst, K. C., … Hara, W. Y. (2018). Clinical perineural invasion of cutaneous head and neck cancer: Impact of radiotherapy, imaging, and nerve growth factor receptors on symptom control and prognosis. Oral Oncology, 85, 60–67. -
Lymphopenia after adjuvant radiotherapy (RT) to predict poor survival in triple-negative breast cancer (TNBC).
Afghahi, A., Mathur, M., Seto, T., Desai, M., Kenkare, P., Horst, K. C., … Sledge, G. W. (2015). Lymphopenia after adjuvant radiotherapy (RT) to predict poor survival in triple-negative breast cancer (TNBC). JOURNAL OF CLINICAL ONCOLOGY. AMER SOC CLINICAL ONCOLOGY. -
Radiation Complications
Horst, K. C. (2011). Radiation Complications. LYMPHEDEMA: A CONCISE COMPENDIUM OF THEORY AND PRACTICE, 515–22. -
Basic Principles of Radiobiology
Horst, K. C., & Giaccia, A. J. (2011). Basic Principles of Radiobiology. BREAST SURGICAL TECHNIQUES AND INTERDISCIPLINARY MANAGEMENT, 799–811. -
Association between primary language, a lack of mammographic screening, and later stage breast cancer presentation.
Balazy, K. E., Benitez, C. M., Gutkin, P. M., Jacobson, C. E., von Eyben, R., & Horst, K. C. (2019). Association between primary language, a lack of mammographic screening, and later stage breast cancer presentation. Cancer. -
Adjuvant treatment and survival in older women with triple negative breast cancer: A Surveillance, Epidemiology, and End Results analysis.
Kozak, M. M., Xiang, M., Pollom, E. L., & Horst, K. C. (2019). Adjuvant treatment and survival in older women with triple negative breast cancer: A Surveillance, Epidemiology, and End Results analysis. The Breast Journal. -
Corrigendum to 'Clinical perineural invasion of cutaneous head and neck cancer: Impact of radiotherapy, imaging, and nerve growth factor receptors on symptom control and prognosis'. [Oral Oncol. 85 (2018) 60-67].
Chen, J. J., Harris, J. P., Kong, C. S., Sunwoo, J. B., Divi, V., Horst, K. C., … Hara, W. Y. (2019). Corrigendum to 'Clinical perineural invasion of cutaneous head and neck cancer: Impact of radiotherapy, imaging, and nerve growth factor receptors on symptom control and prognosis'. [Oral Oncol. 85 (2018) 60-67]. Oral Oncology. -
Integrating Radiosensitivity and Immune Gene Signatures for Predicting Benefit of Radiotherapy in Breast Cancer
Cui, Y., Li, B., Pollom, E. L., Horst, K. C., & Li, R. (2018). Integrating Radiosensitivity and Immune Gene Signatures for Predicting Benefit of Radiotherapy in Breast Cancer. CLINICAL CANCER RESEARCH, 24(19), 4754–62. -
Association between primary language, a lack of mammographic screening, and later stage breast cancer presentation
Balazy, K. E., Benitez, C. M., Gutkin, P. M., Jacobson, C. E., von Eyben, R., & Horst, K. C. (2019). Association between primary language, a lack of mammographic screening, and later stage breast cancer presentation. CANCER, 125(12), 2057–65. -
Use of Preoperative Radiation Therapy in Early-stage and Locally Advanced Breast Cancer
Koenig, J. L., Kozak, M. M., Sabolch, A., Horst, K., Tsai, J., Wapnir, I. L., & Pollom, E. (2019). Use of Preoperative Radiation Therapy in Early-stage and Locally Advanced Breast Cancer. CUREUS, 11(9). -
Use of Preoperative Radiation Therapy in Early-stage and Locally Advanced Breast Cancer.
Koenig, J. L., Kozak, M. M., Sabolch, A., Horst, K., Tsai, J., Wapnir, I. L., & Pollom, E. (2019). Use of Preoperative Radiation Therapy in Early-stage and Locally Advanced Breast Cancer. Cureus, 11(9), e5748. -
Systemic Inflammation after Radiation Predicts Locoregional Recurrence, Progression, and Mortality in Stage II-III Triple-Negative Breast Cancer.
Sherry, A. D., von Eyben, R., Newman, N. B., Gutkin, P., Mayer, I., Horst, K., … Rafat, M. (2019). Systemic Inflammation after Radiation Predicts Locoregional Recurrence, Progression, and Mortality in Stage II-III Triple-Negative Breast Cancer. International Journal of Radiation Oncology, Biology, Physics. -
Health mindset is associated with anxiety and depression in patients undergoing treatment for breast cancer.
Gutkin, P. M., Fero, K. E., Jacobson, C. E., Chen, J. J., Liang, R. V., Kolar, C., … Horst, K. C. (2020). Health mindset is associated with anxiety and depression in patients undergoing treatment for breast cancer. The Breast Journal. -
Erythema of the skin after breast radiotherapy: It is not always recurrence.
Gutkin, P. M., Fernandez-Pol, S., & Horst, K. C. (2020). Erythema of the skin after breast radiotherapy: It is not always recurrence. International Wound Journal. -
Postmastectomy and Regional Nodal Radiation for Breast Cancer.
Torres, M. A., Horst, K. C., & Freedman, G. M. (2020). Postmastectomy and Regional Nodal Radiation for Breast Cancer. Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology, JCO1902908. -
A randomized phase II study comparing surgical excision versus NeOadjuvant Radiotherapy followed by delayed surgical excision of Ductal carcinoma In Situ (NORDIS)
Wapnir, I., DeMartini, W., Allison, K., Stone, K., Dirbas, F., Marquez, C., … Horst, K. (2020). A randomized phase II study comparing surgical excision versus NeOadjuvant Radiotherapy followed by delayed surgical excision of Ductal carcinoma In Situ (NORDIS). CANCER RESEARCH. AMER ASSOC CANCER RESEARCH. -
Patterns of Failure in Women Who Have Residual Nodal Disease After Neoadjuvant Chemotherapy for Breast Cancer According to Extent of Lymph Node Surgery.
Kozak, M. M., Horst, K. C., Gutkin, P. M., Jacobson, C. E., Walck, E., von Eyben, R., & Dirbas, F. M. (2020). Patterns of Failure in Women Who Have Residual Nodal Disease After Neoadjuvant Chemotherapy for Breast Cancer According to Extent of Lymph Node Surgery. Clinical Breast Cancer. -
Continuing Medical Student Education During the Coronavirus Disease 2019 (COVID-19) Pandemic: Development of a Virtual Radiation Oncology Clerkship.
Pollom, E. L., Sandhu, N., Frank, J., Miller, J. A., Obeid, J.-P., Kastelowitz, N., … Gibbs, I. (2020). Continuing Medical Student Education During the Coronavirus Disease 2019 (COVID-19) Pandemic: Development of a Virtual Radiation Oncology Clerkship. Advances in Radiation Oncology, 5(4), 732–36. -
Importance of a Culture Committee for Boosting Morale and Maintaining a Healthy Work Environment in Radiation Oncology.
Gutkin, P. M., Minneci, M. O., Valenton, J., Kovalchuk, N., Chang, D. T., & Horst, K. C. (2020). Importance of a Culture Committee for Boosting Morale and Maintaining a Healthy Work Environment in Radiation Oncology. Advances in Radiation Oncology. -
Impact of mastectomy for breast cancer on spinal curvature: Considerations when treating patients with scoliosis.
Gutkin, P. M., Kapp, D. S., von Eyben, R., Dirbas, F. M., & Horst, K. C. (2020). Impact of mastectomy for breast cancer on spinal curvature: Considerations when treating patients with scoliosis. The Breast Journal. -
Development of a Classification Tree to Predict Implant-Based Reconstruction Failure with or without Postmastectomy Radiation Therapy for Breast Cancer.
Chen, J. J., von Eyben, R., Gutkin, P. M., Hawley, E., Dirbas, F. M., Lee, G. K., & Horst, K. C. (2020). Development of a Classification Tree to Predict Implant-Based Reconstruction Failure with or without Postmastectomy Radiation Therapy for Breast Cancer. Annals of Surgical Oncology. -
ASO Author Reflections: Sequential Decision Tree Analysis Reveals Pivotal Branch Points in Predicting Implant-Based Reconstruction Failure Outcomes.
Chen, J. J., & Horst, K. C. (2020). ASO Author Reflections: Sequential Decision Tree Analysis Reveals Pivotal Branch Points in Predicting Implant-Based Reconstruction Failure Outcomes. Annals of Surgical Oncology. -
Angiosarcoma of the Breast: Management and Outcomes.
Gutkin, P. M., Ganjoo, K. N., Lohman, M., von Eyben, R., Charville, G. W., Nazerali, R. S., … Horst, K. C. (2020). Angiosarcoma of the Breast: Management and Outcomes. American Journal of Clinical Oncology. -
Virtual Radiation Oncology Clerkship During the COVID-19 Pandemic and Beyond.
Sandhu, N., Frank, J., von Eyben, R., Miller, J., Obeid, J.-P., Kastelowitz, N., … Pollom, E. (2020). Virtual Radiation Oncology Clerkship During the COVID-19 Pandemic and Beyond. International Journal of Radiation Oncology, Biology, Physics, 108(2), 444–51. -
Telemedicine in Radiation Oncology: Is It Here to Stay? Impacts on Patient Care and Resident Education.
Gutkin, P. M., Prionas, N. D., Minneci, M. O., Allen, E. 3rd, Balazy, K. E., Rahimy, E., … Horst, K. C. (2020). Telemedicine in Radiation Oncology: Is It Here to Stay? Impacts on Patient Care and Resident Education. International Journal of Radiation Oncology, Biology, Physics, 108(2), 416–20. -
Lymphopenia and clinical outcomes in patients with residual nodal disease after neoadjuvant chemotherapy for breast cancer.
Gutkin, P. M., Kozak, M. M., von Eyben, R., & Horst, K. C. (2020). Lymphopenia and clinical outcomes in patients with residual nodal disease after neoadjuvant chemotherapy for breast cancer. Cancer Causes & Control : CCC. -
Insurance status and ethnicity/race are associated with late-stage presentation for breast cancer patients
Balazy, K. E., Benitez, C. M., Jacobson, C. E., Von Eyben, R., & Horst, K. C. (2020). Insurance status and ethnicity/race are associated with late-stage presentation for breast cancer patients. CANCER EPIDEMIOLOGY BIOMARKERS & PREVENTION, 29(6). -
Insurance status and ethnicity/race are associated with late-stage presentation for breast cancer patients
Balazy, K. E., Benitez, C. M., Jacobson, C. E., Von Eyben, R., & Horst, K. C. (2020). Insurance status and ethnicity/race are associated with late-stage presentation for breast cancer patients. CANCER EPIDEMIOLOGY BIOMARKERS & PREVENTION, 29(6). -
Association between Patient Education Videos and Knowledge of Radiation Treatment.
Kumar, K. A., Balazy, K. E., Gutkin, P. M., Jacobson, C. E., Chen, J. J., Karl, J., … Horst, K. C. (2020). Association between Patient Education Videos and Knowledge of Radiation Treatment. International Journal of Radiation Oncology, Biology, Physics. -
Inflammation mediates the development of aggressive breast cancer following radiotherapy.
Ma, L., Gonzalez-Junca, A., Zheng, Y., Ouyang, H., Illa-Bochaca, I., Horst, K. C., … Barcellos-Hoff, M. H. (2021). Inflammation mediates the development of aggressive breast cancer following radiotherapy. Clinical Cancer Research : an Official Journal of the American Association for Cancer Research. -
Locoregional and Distant Outcomes in Women With cT1-3N1 Breast Cancer Treated With Neoadjuvant Chemotherapy With or Without Adjuvant Radiotherapy.
Kozak, M. M., von Eyben, R., Gutkin, P. M., Vemuri, M., Jacobson, C. E., Karl, J. J., … Horst, K. C. (2021). Locoregional and Distant Outcomes in Women With cT1-3N1 Breast Cancer Treated With Neoadjuvant Chemotherapy With or Without Adjuvant Radiotherapy. Clinical Breast Cancer. -
Surgical Excision Versus Neoadjuvant Radiotherapy Followed by Delayed Surgical Excision of Ductal Carcinoma In Situ (NORDIS).
Rossi, A. J., Verbus, E. A., Horst, K., De Martini, W., Allison, K., Hernandez, J. M., & Wapnir, I. L. (2021). Surgical Excision Versus Neoadjuvant Radiotherapy Followed by Delayed Surgical Excision of Ductal Carcinoma In Situ (NORDIS). Annals of Surgical Oncology. -
Use of breast MRI to distinguish treatment failure versus new primary tumor following single fraction breast intraoperative radiotherapy for breast cancer (SF-IORT).
Payne, S., Payne, S., Horst, K. C., Ikeda, D. M., & Dirbas, F. M. (2022). Use of breast MRI to distinguish treatment failure versus new primary tumor following single fraction breast intraoperative radiotherapy for breast cancer (SF-IORT). JOURNAL OF CLINICAL ONCOLOGY. LIPPINCOTT WILLIAMS & WILKINS. -
Utilizing a Culture Committee to Improve and Maintain a Positive Workplace Environment During a Global Pandemic.
Lau, B., Guo, F., Valenton, J., Chang, D., Le, Q.-T., & Horst, K. (2023). Utilizing a Culture Committee to Improve and Maintain a Positive Workplace Environment During a Global Pandemic. Practical Radiation Oncology. -
Management of Local-Regional Recurrence of Breast Cancer
Hui, C., Dirbas, F. M. M., & Horst, K. C. C. (2023). Management of Local-Regional Recurrence of Breast Cancer. CURRENT BREAST CANCER REPORTS. -
Individualized Stereotactic Ablative Radiotherapy for Lung Tumors: The iSABR Phase 2 Nonrandomized Controlled Trial.
Gensheimer, M. F., Gee, H., Shirato, H., Taguchi, H., Snyder, J. M., Chin, A. L., … Diehn, M. (2023). Individualized Stereotactic Ablative Radiotherapy for Lung Tumors: The iSABR Phase 2 Nonrandomized Controlled Trial. JAMA Oncology.
Clinical Trials
Clinical trials are research studies that evaluate a new medical approach, device, drug, or other treatment. As a Stanford Health Care patient, you may have access to the latest, advanced clinical trials.
Open trials refer to studies currently accepting participants. Closed trials are not currently enrolling, but may open in the future.
- Assessment of Patient Experience During Treatment for Cancer »
- CyberKnife Radiosurgical Treatment of Inoperable Early Stage Non-Small Cell Lung Cancer »
- Radiation Therapy With or Without Trastuzumab in Treating Women With Ductal Carcinoma In Situ Who Have Undergone Lumpectomy »
- Cyberknife® Partial Breast Irradiation (PBI) for Early Stage Breast Cancer »
- Molecular and Cellular Analysis of Breast Cancer »
- The IDEA Study (Individualized Decisions for Endocrine Therapy Alone) »
- Accelerated Partial Breast Irradiation Following Lumpectomy for Breast Cancer »
- Breast Density and the Role of Preoperative Mammography, Ultrasound, Elastography and MRI »
Practice Locations
Radiation Oncology at Blake Wilbur Building Palo Alto, CA
Palo Alto, CARadiation Oncology at Blake Wilbur Building
875 Blake Wilbur Drive
Palo Alto , CA 94304
Make An Appointment More Clinic Information » Getting Here »Important Information about Our Organizations and Physician Affiliation
Stanford Health Care, Stanford Health Care Tri-Valley, and Stanford Medicine Partners are each independent nonprofit organizations that are affiliated with but separate from each other and from Stanford University. The physicians who provide care at facilities operated by Stanford Health Care, Stanford Health Care Tri-Valley, and Stanford Medicine Partners are faculty, foundation, or community physicians who are not employees, representatives, or agents of Stanford Health Care, Stanford Health Care Tri- Valley, or Stanford Medicine Partners. Stanford Health Care, Stanford Health Care Tri-Valley, and Stanford Medicine Partners do not exercise control over the care provided by such faculty, foundation, and community physicians and are not responsible for their actions.
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Referring Physicians
PHYSICIAN HELPLINE
Fax: 650-320-9443
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Stanford Health Care provides comprehensive services to refer and track patients, as well as the latest information and news for physicians and office staff. For help with all referral needs and questions, visit Referring Physicians.
You may also submit a web referral or complete a referral form and fax it to 650-320-9443 or email the Referral Center at ReferralCenter@stanfordhealthcare.org.

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