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Professional Summary
Professional Education
- 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, 33(15). -
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.
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 »
- Cyberknife® Partial Breast Irradiation (PBI) for Early Stage Breast Cancer »
- Radiation Therapy With or Without Trastuzumab in Treating Women With Ductal Carcinoma In Situ Who Have Undergone Lumpectomy »
- Accelerated Partial Breast Irradiation Following Lumpectomy for Breast Cancer »
- Molecular and Cellular Analysis of Breast Cancer »
- The IDEA Study (Individualized Decisions for Endocrine Therapy Alone) »
- 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, CA
Radiation Oncology at Blake Wilbur Building
875 Blake Wilbur Drive
Palo Alto , CA 94304
Make An Appointment More Clinic Information » Getting Here »Patient Reviews
(125 reviews)
I felt very reassured after our meeting about my current progress & treatment plan
Dr Horst left me lightweight and confident explaining the treatment and listening to all my questions and concerns till the end.
Very informative and direct, and personally was very attentive and friendly.
Thanks for flexibility
Everything was on time, and everyone was professional.
A talented, dedicated and compassionate physician. One couldn't ask for more.
Dr Horst is always engaged and takes her time with me.
She is very good with the basics which I needed to understand...a very good profession with empathy!
She explained everything I needed to know.
Dr Horst explained possible future treatments in terms that I could under stand.
Dr Horst is one of the doctors with whom you have a great sense of assurance with her care. You know she will take the extra step to be sure patients receive the very best care.
Dear Dr. Horst: Thanks. I get your take care well.
Excellent communicatior. Enjoy working with her and her team
Was good a quick visit as the doctor did not have results
Dr. Horst is absolutely the best!! She explains everything, takes the time to listen and discuss options available. Always make me feel comfortable and valued as a patient. I feel that I am in good hands as her patient.
Dr Horst was extremely thorough with her information and explaining the facts and figures.
Answered my questions without hesitation and in easily understand language.
Was a very good 'visit' and left me with much to think about and consider.
Dr Horst is one of the most caring, intelligent, and thoughtful physicians I have ever encountered.
Dr. Horst is absolutely amazing. She's top of her field, smart, and compassionate. I feel so much better about my cancer diagnosis after speaking with her.
I was told that she is very kind and great at explaining things. That person was Right! I felt very comfortable with Dr. Horst and I knew I could trust her. I'm glad she is going to be my doctor!
Dr. Horst is a great listener and very attentive. I am very pleased she is my doctor.
Appreciated the time she spent answering my questions. Excellent visit with her.
Dr. Horst is very knowledgeable, has excellent communication skills and style. She answered all my questions and wanted to make sure my husband and I were satisfied with her responses. Very impressive.
A welcoming smile and gentle care
Dr. Horst is just outstanding. Her Radiation team is outstanding.
Dr. Horst is very attentive, very caring and answers all the Q's and concerns of the patient. Very skilled clinician with excellent Dr./patient relations.
Stanford and patients like me are very lucky to have Dr. Horst on the faculty.
Always the best.
I find her to be excellent and informative.
She is the most compassionate and empathetic Dr. I know from the Women Cancer Center.
She is also the only Dr. that has mapped a plan than actually gave me some positive results on my healthy status.
By far I consider her one of my favorite Drs. On my Oncology team of care.
Thanks you for reviewing my case to be sure I did not need radiation at this point.
She was excellent. Explained clearly all the relevant information.
Dr. Horst is an excellent caring Dr. Very easy to talk with. She is very through. I'm very happy she is my Dr.
She is great! Dr. Horst always provides valuable information and answers my questions thoroughly.
Thank you so much ! Dr Horst,
It’s been five years since my cyber knife.â ¤ï¸
A very good doctor
Dr. Horst is an excellent .
She was kind, insightful and attentive
She seems excellent. Caring and knowledgeable.
Dr. Horst and her team were fantastic.
I’ve always felt that Dr Horst gave me her full attention and listened to my concerns.
Di like Dr. Horst. She is fun to talk to and always ready to help in case there’s a problem on your health arise.
She was clear in her explanation, allowed for my questions and gave clear response. She was very professional and knowledgeable, while also being very approachable.
Dr Horst and her team have all been amazing throughout this process - they have been kind and caring and I feel I have revived the best support possible.
I liked her. She presented the information very well and answered my questions.
She and others at Stanford saved my life. She’s a rock star!
Dr. Horst was wonderful. She is kind, knowledgeable and takes the time necessary to answer all of your questions. I feel very fortunate to have her oversee my radiation therapy treatment.
Extremely thorough and displayed compassion and genuine concern. Very
Positive
This was my first meeting with Dr Horst. She has a pleasant demeanor and was informative, confirming and supplementing the detailed introduction carried out by Dr Frick.
Very positive and her team always seems happy.
She is wonderful! She is kind, lovely and keeps a take your breath away schedule.
Thank you so much I Dr. Horst
Dr. Horst is professional, knowledgeable, personable, competent. She explains things well, and had plenty of time to answer my questions, some of which may have been repeat questions due to a bit of nervousness on my part. Nevertheless, she was extremely patient. She was very accommodating to my personal needs re: setting up the upcoming radiation schedule. I feel like she understands that life goes on around us despite a cancer diagnosis, and that coordinating my personal needs with medical needs is important to her.
Dr. Horst is an excellent physician. In addition she listens well and gives me an opportunity to ask questions and participate in the plan of care.
She was very friendly and informative.
Dr. Horst and her resident both responded to my questions and concerns in a professional, competent and supportive manner. Dr. Horst’s team also followed up today with links to websites that further addressed my questions.
Engaged in questions and answers, talked about overall functioning, explained research findings about an area of concern and what that may indicate. Discussed future steps and care.
Very good experience.
Dr. Horst is a wonderful care provider/dr. she listens, offers advice, had a friendly & calm demeanor.
I love Dr. Horst - Very knowledgeable very caring and compassionate. The resident and fellow present also exhibited their knowledge & were equally caring.
Dr. Horst is friendly, knowledgeable, patient in answering questions & giving information. She's great & I would highly recommend her.
Dr. Horst excellent in every way.
This provider helped save my life when I had stage III cancer so I'm very confident & optimistic that her TX plan will also be very successful now that I am stage IV cancer. Dr. Horst has SUCH positive energy, is an expert in her field; mentors others and is very compassionate. I have highly recommended her to other patients.
Dr. Horst was very patient and kindly explained all treatment options and answered all our questions.
Amazing! Kate is the best! So smart & so caring!
She was amazing, very thorough.
The doctor clearly explains all aspects of visit and follow-up, and she listens carefully to concerns or questions (and answers completely.)
Dr. Horst was excellent!
Dr. Horst is excellent! My 7th year with her - always the best and always feel so cared for by her. Kind and incredible person.
Very well pleased.
New/temporary/researcher, great care & attention.
The fellow this time was very good. The new NP was learning, & Dr. Horst is always awesome.
Kathleen is an exceptional physician! She cares about her patient provides good explanation of my medical condition, & what the research shows regarding topics that concern me & health. She is great!
Dr. Horst continues to exceed all expectations as a care provider. During this visit there was a resident/student as well - lucky him - he gets to see the highest example of care in this field.
Dr. Horst very good at explaining choices available to me & & pros & cons on radiation treatment.
I love Dr. Horst. She is a wonderful physician. She has very knowledgeable & caring staff.
Services were provided mostly by technicians.
I'm so grateful to have Dr. Horst as my health care provider. I knew I could rely on her intelligence and her compassion. Stanford is VERY lucky to have her.
I drive 360 miles (one-way) to see Dr. Horst annually because of the outstanding care and concern she has personally given tome. I cannot imagine having a care provider better than her. Absolutely, tops!
Dr. Horst is wonderful. She took the time to explain everything very clearly and answered all my questions. Highly recommended!
If you have to be sick Stanford is a great place to get help.
I would run out of superlatives to describe Dr. Horst's bedside manner. Dr. Horst is simply the best in her class!
Very good.
Dr. Horst is friendly, caring, and knowledgeable. Excellent physician!
Dr. Horst is an incredible doctor. She is caring and goes above and beyond to manage my needs.
She is an excellent doctor.
Great experience!! These people came in dr. on staff 1st went over all records and did exam. Nurse then came in went over all information and answering families questions. Then Doctor Hurst came in and went over options and answered question.
Dr. Horst is a good doctor.
Always feel well cared for by Dr. Horst!
Dr. Horst is such a caring and compassionate doctor. A great listener, who always puts her patients first. A+. Her nurse coordinator, Christy is fantastic!
Dr. Horst always answered all my questions before she left the room.
Dr. Horst is great. She is very kind & caring. I was recommended to her & I'll do the same for someone else! Love her.
I've always been treated with respect, dignity, kindness. I've been given clearly explained options; treatment provided expeditiously. I don't know how they manage to give each patient full attention AND run on time!
So very happy with Dr. Horst. She always accommodates my appt. to coincide with my oncologist, same day appt. As we travel almost 2 hrs. ea. way. Appreciate her. Very good Doctor.
Dr. Horst's explanations are crystal-clear. She is attentive to concerns and thorough and understanding her her responses to questions. She provides exceptionally positive care.
Very good continuity of care & knowledge of past personal medical history even past providers that have moved on beyond Stanford & how they are doing. 9. Known both many years now.
Never felt hurried.
Dr. Hurst returned calls ASAP & caring, too.
Outstanding information. Caring staff, professional.
Dr. Horst made it possible for me to attend my daughter's wedding - truly amazing.
Dr. Horst is VERY caring.
Dr. Horst is excellent - patient, kind, knowledgeable.
Dr. Horst so excellent. Makes me feel secure.
Dr Horst always keeps me informed of current info related to our study. I love her, she is the best!
Dr. Horst makes her patients feel comfortable, unafraid, and well cared for in every way. She is a superb physician, and I feel privileged to be her patient.
Outstanding care - Attentive, caring, professional, calm, reassuring, just plain nice person.
Dr. Horst is great -
Dr. Horst was excellent - very knowledgeable, patient, kind, caring. She provided lots of great info to help me make my decision about treatment.
Dr. Horst & wonderfully sharp & caring always.
Dr. Horst is superb at what she does and how she relates to her patients. I have also observed her taking time to teach her residents & include them in discussion.
I look forward to my annual visits.
I actually came back to this provider multiple times for care due to my lack of confidence in my own provider in Santa Cruz. Love Dr. Horst!!!
Dr. Horst is a wonderful doctor. She cares her patients just like family.
Kate Horst, her Intern & the Resident were all thorough & pleasant. I liked them all a lot. Much, much better than my previous experience w/Stanford Radiation Oncology 12 yrs. ago.
Both Dr. Hortz and her resident, Dr. Shafer were very helpful- "dream team!"
Outstanding level of respect, care and knowledge given - Dr. Horst & Dr. Shah were compassionate and addressed our concerns thoroughly & thoughtfully.
Dr. Horst & Dr. Shah are excellent. As is Christy (RN) in radiation oncology.
Dr. Horst is wonderful, caring physician. Answered all my questions.
Very good experience.
She always showed compassion, but this last visit was best.
Great experience! Got answers to all my questions.
Dr. Horst is excellent!
Dr. Horst went out of her way to think through my clinical condition and gave me a very thorough easy to understand, thoughtful explanations.
I have had exceptionally wonderful treatment for the breast cancer in 2007 and all the follow up since then.
Very good experience. Dr. Horst is the best!
Dr. Horst has always gone way beyond what is necessary. She has excellent. Suggestions for my continuing care.
She is best ever! Compassionate & very good @ explaining shocking news.
Dr. Horst is exceptional. She goes beyond her specialty & is concerned w/the whole path of treatment.
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