Olwen Hahn, MD, specializes in the diagnosis and treatment of breast cancer. Dr. Hahn’s practice primarily focuses on treating patients with all forms of breast cancer. For a comprehensive range of breast cancer treatments, Dr. Hahn offers both standard of care, such as chemotherapy, targeted therapy and endocrine therapy, as well as therapeutic clinical trials in order to deliver the best care for her patients. She is also a proponent of using systemic therapy (chemotherapy, targeted therapy, immunotherapy or endocrine therapy) prior to surgery (neoadjuvant therapy) to better understand how each patient’s individual tumor responds to therapy.
In addition to her clinical practice, Dr. Hahn is committed to elevating cancer care through clinical trials, and is a strong advocate in offering clinical trials to her patients. Additionally, she has worked with the National Cancer Institute (NCI)-sponsored cooperative group Cancer and Leukemia Group B (CALGB) and the Alliance for Clinical Trials in Oncology as an Executive Officer between 2008-2017, where she assisted in the development and conduct of oncology clinical trials. In 2019, she assumed the position of Director and Principal Investigator of the Alliance Central Protocol Operations Program as well as the Vice President of Alliance Foundation for Clinical Trials in Oncology. In this role, Dr. Hahn oversees the clinical operations for a large portfolio of multi-institutional, national oncology studies.
A randomized phase II trial of nab-paclitaxel with or without mifepristone for advanced triple-negative breast cancer.
A randomized phase II trial of nab-paclitaxel with or without mifepristone for advanced triple-negative breast cancer. Breast Cancer Res Treat. 2025 May; 211(1):111-119.
PMID: 39928262
Evaluation of cyclin-dependent kinase 4/6 inhibitor-induced serum creatinine elevations in patients with hormone receptor positive breast cancer.
Evaluation of cyclin-dependent kinase 4/6 inhibitor-induced serum creatinine elevations in patients with hormone receptor positive breast cancer. J Oncol Pharm Pract. 2024 Dec 09; 10781552241305417.
PMID: 39648753
Retrospective evaluation of adjuvant capecitabine dosing patterns in triple negative breast cancer.
Retrospective evaluation of adjuvant capecitabine dosing patterns in triple negative breast cancer. J Oncol Pharm Pract. 2024 Oct 13; 10781552241289581.
PMID: 39397422
Adjuvant Pembrolizumab versus Observation in Muscle-Invasive Urothelial Carcinoma.
Adjuvant Pembrolizumab versus Observation in Muscle-Invasive Urothelial Carcinoma. N Engl J Med. 2025 Jan 02; 392(1):45-55.
PMID: 39282902
Impact of the COVID-19 Pandemic on Cancer Clinical Trials: Alliance for Clinical Trials in Oncology Experience (Alliance A152022).
Impact of the COVID-19 Pandemic on Cancer Clinical Trials: Alliance for Clinical Trials in Oncology Experience (Alliance A152022). J Clin Trials. 2024; 14(5).
PMID: 39296880
Aspirin vs Placebo as Adjuvant Therapy for Breast Cancer: The Alliance A011502 Randomized Trial.
Aspirin vs Placebo as Adjuvant Therapy for Breast Cancer: The Alliance A011502 Randomized Trial. JAMA. 2024 05 28; 331(20):1714-1721.
PMID: 38683596
Endocrine-Sensitive Disease Rate in Postmenopausal Patients With Estrogen Receptor-Rich/ERBB2-Negative Breast Cancer Receiving Neoadjuvant Anastrozole, Fulvestrant, or Their Combination: A Phase 3 Randomized Clinical Trial.
Endocrine-Sensitive Disease Rate in Postmenopausal Patients With Estrogen Receptor-Rich/ERBB2-Negative Breast Cancer Receiving Neoadjuvant Anastrozole, Fulvestrant, or Their Combination: A Phase 3 Randomized Clinical Trial. JAMA Oncol. 2024 Mar 01; 10(3):362-371.
PMID: 38236590
Validation of the RSClin risk calculator in the National Cancer Data Base.
Validation of the RSClin risk calculator in the National Cancer Data Base. Cancer. 2024 Apr 15; 130(8):1210-1220.
PMID: 38146744
The impact of race and age on response to neoadjuvant therapy and long-term outcomes in Black and White women with early-stage breast cancer.
The impact of race and age on response to neoadjuvant therapy and long-term outcomes in Black and White women with early-stage breast cancer. Breast Cancer Res Treat. 2023 Jul; 200(1):75-83.
PMID: 37120458
Adapting a Medical School Cancer Research Education Program to the Virtual Environment: a Mixed-Methods Study.
Adapting a Medical School Cancer Research Education Program to the Virtual Environment: a Mixed-Methods Study. J Cancer Educ. 2023 10; 38(5):1501-1508.
PMID: 37058222