Kathleen Horst, MD

Radiation oncologist

Assistant Professor of Radiation Oncology (Radiation Therapy) at the Stanford University Medical Center

Radiation Oncology

  • 875 Blake Wilbur Drive
  • Palo Alto, CA 94304
  • Phone: 650-498-6000
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Breast Cancer Program

  • 900 Blake Wilbur Drive
  • Palo Alto, CA 94304
  • Phone: 650-498-6004
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Women's Cancer Center

  • 900 Blake Wilbur Drive
  • Palo Alto, CA 94304
  • Phone: 650-498-6004
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Cyberknife Stereotactic Radiosurgery Program

  • 900 Blake Wilbur Drive
  • Palo Alto, CA 94304
  • Phone: 650-725-0084
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Cyberknife Stereotactic Radiosurgery Program at Advanced Medicine Center Building

  • 875 Blake Wilbur Drive
  • Palo Alto, CA 94304
  • Phone: 650-725-0084
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Cyberknife Stereotactic Radiosurgery Program at Boswell Building

  • 300 Pasteur Drive
  • Stanford, CA 94305
  • Phone: 650-725-0084
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Professional Education

Internship: Santa Clara Valley Medical Center (2000) CA

Residency: Stanford University - Radiation Oncology (2004) CA

Board Certification: Radiation Oncology, American Board of Radiology (2005)

Medical Education: Stanford University School of Medicine (1999) CA

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. Er., Arthur, D. W., Bailey, L., & 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), 178-182.

ACR Appropriateness Criteria (R) Ductal Carcinoma in Situ
Moran, M. S., Bai, H. X., Harris, E. Er., Arthur, D. W., Bailey, L., & Haffty, B. G. (2012). ACR Appropriateness Criteria (R) Ductal Carcinoma in Situ. BREAST JOURNAL, 18(1), 8-15.

ACR Appropriateness Criteria (R) Locally Advanced Breast Cancer
MacDonald, S. M., Harris, E. Er., Arthur, D. W., Bailey, L., Bellon, J. R., & Haffty, B. G. (2011). ACR Appropriateness Criteria (R) Locally Advanced Breast Cancer. BREAST JOURNAL, 17(6), 579-585.

ACR Appropriateness Criteria (R) Conservative surgery and Radiation - Stage I and II Breast Carcinoma
Bellon, J. R., Harris, E. Er., Arthur, D. W., Bailey, L., Carey, L., & Haffty, B. G. (2011). ACR Appropriateness Criteria (R) Conservative surgery and Radiation - Stage I and II Breast Carcinoma. BREAST JOURNAL, 17(5), 448-455.

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., & 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, 75(1), 285-293.

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), 324-330.

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), 254-262.

Intraoperative Radiotherapy following Lumpectomy for Breast Cancer
Dirbas FM, & Horst KC. (2007). Intraoperative Radiotherapy following Lumpectomy for Breast Cancer. 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
Smitt MC, & Horst K. (2007). Association of Clinical and Pathologic Variables with Lumpectomy Surgical Margin Status after Preoperative Diagnosis or Excisional Biopsy of Invasive Breast Cancer. Ann Surg Oncol, 14(3).

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, 190(4), 633-640.

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), 425-438.

Predictors of Re-excision Findings and Ipsilateral Breast Tumor Recurrence after Breast Conservation Therapy
Horst KC, Smitt MC, & Goffinet DR. (2004). Predictors of Re-excision Findings and Ipsilateral Breast Tumor Recurrence after Breast Conservation Therapy. Current Medical Literature, 16(4).