Kathleen Claire Horst MD
Assistant Professor, Radiation Oncology, Stanford University Medical Center
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875 Blake Wilbur DrCc-G221aStanford, CA 94305
Phone+1 650-736-0921
Fax+1 650-725-8231
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Education & Training
Stanford Health Care-Sponsored Stanford UniversityResidency, Radiation Oncology, 2000 - 2004
Santa Clara Valley Medical CenterInternship, Transitional Year, 1999 - 2000
Stanford University School of MedicineClass of 1999
Certifications & Licensure
CA State Medical License 2000 - 2026
American Board of Radiology Radiation Oncology
Awards, Honors, & Recognition
- CMS Meaningful Use Stage 1 Certification EpicCare Ambulatory EMR, Epic Systems Corporation, 2011-2013
Clinical Trials
- Whole-Brain Radiation Therapy or Stereotactic Radiosurgery With or Without Lapatinib Ditosylate in Treating Patients With Brain Metastasis From HER2-Positive Breast Cancer Start of enrollment: 2012 Dec 06
- Lapatinib Ditosylate and Radiation Therapy in Treating Patients With Locally Advanced or Locally Recurrent Breast Cancer Start of enrollment: 2013 Jul 01
- Standard or Comprehensive Radiation Therapy in Treating Patients With Early-Stage Breast Cancer Previously Treated With Chemotherapy and Surgery Start of enrollment: 2013 Aug 01
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Publications & Presentations
PubMed
- Impact of timing and breastfeeding on postpartum breast cancer diagnostic patterns and outcomes.Daniella Klebaner, Natalie Park, Kimberly Stone, Fauzia Riaz, Susan Crowe
Breast Cancer Research and Treatment. 2025-11-01 - 1 citationsPostmastectomy Radiation Therapy: An ASTRO-ASCO-SSO Clinical Practice Guideline.Rachel B Jimenez, Yara Abdou, Penny Anderson, Parul Barry, Lisa Bradfield
Journal of Clinical Oncology. 2025-10-20 - Postmastectomy Radiation Therapy: An ASTRO/ASCO/SSO Clinical Practice Guideline.Rachel B Jimenez, Yara Abdou, Penny Anderson, Parul Barry, Lisa Bradfield
Practical Radiation Oncology. 2025-09-16
Press Mentions
New Guideline Reflects the Latest Evidence in Support of Postmastectomy Radiation Therapy for Patients with Breast CancerSeptember 16th, 2025- Leading Cancer Organizations Release Updated Guideline on Post-Mastectomy Radiation TherapySeptember 15th, 2025
- Plenary Session SummaryOctober 8th, 2024
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