The 20 Best Triple-Negative Breast Cancer Doctors Near Me in Santa Monica, CA

Find the Top Triple-Negative Breast Cancer Experts and Specialists

Last Updated: 04/28/2026

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MediFind found 18213 doctor with experience in Triple-Negative Breast Cancer near Santa Monica, CA. Of these, 14405 are Experienced, 3380 are Advanced, 345 are Distinguished and 79 are Elite.

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18,213 providers found
    Elite in Triple-Negative Breast Cancer
    Oncology | Hematology Oncology
    Elite in Triple-Negative Breast Cancer
    Oncology | Hematology Oncology

    Yale University

    35 Park St, 
    New Haven, CT 
    Languages Spoken:
    English

    Eric Winer is an Oncologist and a Hematologist Oncology provider practicing medicine in New Haven, Connecticut. Dr. Winer is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. He is also highly rated in 13 other conditions, according to our data. His clinical expertise encompasses Breast Cancer, Triple-Negative Breast Cancer, HER-2 Positive Breast Cancer, and Breast Cancer in Men.

    Elite in Triple-Negative Breast Cancer
    Oncology | Internal Medicine
    Elite in Triple-Negative Breast Cancer
    Oncology | Internal Medicine

    Texas Oncology, P.A.

    3410 Worth Street, Suite 400, 
    Dallas, TX 
    Experience:
    44+ years
    Languages Spoken:
    English
    Offers Telehealth

    Dr. O'Shaughnessy is a Medical Oncologist that focuses on breast cancer prevention and treatment. She founded The School of Breast Oncology, a program providing a curriculum-based program focused exclusively on breast cancer clinical management. Dr. O'Shaughnessy attended medical school at Yale University School of Medicine in New Haven, CT. She then completed her Internal Medicine residency at Massachusetts General Hospital in Boston, MA and a Medical Oncology fellowship at National Cancer Institute in Bethesda, MD. She is co-chair of Breast Cancer Research, chair of Breast Cancer Prevention Research at Baylor Charles A. Sammons Cancer Center and a member of the Scientific Advisory Board for US Oncology Research Network. Dr. O'shaughnessy is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. She is also highly rated in 14 other conditions, according to our data. Her clinical expertise encompasses Breast Cancer, Triple-Negative Breast Cancer, PIK3CA-Related Overgrowth Spectrum, Inflammatory Breast Cancer, and Tissue Biopsy. Dr. O'shaughnessy is board certified in Medical Oncology- American Board Of Internal Med/Medical Oncology, Internal Medicine- American Board Of Internal Med, Internal Medicine- American Board Of Internal Medicine, and Medical Oncology- American Board Of Internal Medicine.

    Elite in Triple-Negative Breast Cancer
    Surgical Oncology
    Elite in Triple-Negative Breast Cancer
    Surgical Oncology

    Beth Israel Deaconess Medical Center - Surgery

    330 Brookline Avenue, Shapiro 5, 
    Boston, MA 
    Languages Spoken:
    English

    Elizabeth Mittendorf is a Surgical Oncologist practicing medicine in Boston, Massachusetts. Dr. Mittendorf is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. She is also highly rated in 7 other conditions, according to our data. Her clinical expertise encompasses Breast Cancer, Triple-Negative Breast Cancer, HER-2 Positive Breast Cancer, Inflammatory Breast Cancer, and Lymphadenectomy. Dr. Mittendorf is board certified in American Board Of Surgery.

    Learn about our expert tiers
    Elite in Triple-Negative Breast Cancer
    Surgical Oncology | Oncology | General Surgery
    Elite in Triple-Negative Breast Cancer
    Surgical Oncology | Oncology | General Surgery

    Baylor St. Luke's - O’Quinn Medical Tower At McNair

    1919 Old Spanish Trail, 
    Houston, TX 
    Languages Spoken:
    English
    Accepting New Patients

    Dr. Alastair Thompson is a surgical oncologist specializing in breast cancer. He is the Professor and Chief of the Division of Surgical Oncology, Section of Breast Surgery at Baylor College of Medicine, where he holds the Olga Keith Wiess Chair of Surgery. He also serves as Co-Director of the Lester and Sue Smith Breast Center and is Co-Associate Director for Clinical Research at the Dan L Duncan Comprehensive Cancer Center.Dr. Thomspon’s clinical interests include: ductal carcinoma in situ (DCIS); nipple and skin sparing mastectomy; breast conservation surgery; and sentinel lymph node biopsy. His research interests include: multidisciplinary patient care alongside “bench to bedside” studies; and innovative clinical trials in cancer. He initiated and led a successful breast cancer laboratory program; provided leadership for a cancer center in the United Kingdom; chaired the UK national breast cancer trials portfolio of 120 studies; and engaged in a range of pivotal roles in key drug, radiation therapy and surgical trials involving the UK, Europe, United States and Australia.Dr. Thompson also has preclinical and practical experience in the design, implementation, monitoring and reporting of early- to late-phase drug and medical device trials. Dr. Thompson received his MBChB in Medicine Surgery and medical degree in Molecular Biology from the University of Edinburgh in Edinburgh, Scotland. He completed his residency in general surgery at the Royal Infirmary of Edinburgh and a Research Fellowship at the Imperial Cancer Research Fund in Edinburgh.Dr. Thompson has co-chaired the Comparison of Operative to Monitoring and Endocrine Therapy (COMET) Trial for low-risk DCIS; and the National Cancer Institute (NCI)-Breast Cancer Steering Committee proposed “no surgery” clinical trial planning committee. He is a member of the NCI BOLD taskforce and has held leadership positions in the Translational Breast Cancer Research Consortium and SWOG Cancer Research Network.Dr. Thompson is also a member of the American Society of Clinical Oncology, Association of Breast Surgery, British Association of Surgical Oncology, British Breast Group, American Society of Breast Surgeons, American Association for Cancer Research, Moynihan Chirurgical Club, and the Society of Surgical Oncology. Dr. Thompson is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. He is also highly rated in 6 other conditions, according to our data. His clinical expertise encompasses Breast Cancer, Triple-Negative Breast Cancer, Inflammatory Breast Cancer, Mastectomy, and Tissue Biopsy. Dr. Thompson is currently accepting new patients.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer

    Dana-Farber Cancer Institute, Breast Oncology Program

    450 Brookline Avenue, Susan F. Smith Center For Women's Cancers, 
    Boston, MA 
    Languages Spoken:
    English

    Dr. Tolaney is Chief of the Division of Breast Oncology at Dana-Farber Cancer Institute, and Associate Professor of Medicine at Harvard Medical School.  She is a breast medical oncologist whose research focuses on the development of novel therapies in the treatment of breast cancer.  She has been instrumental in developing several treatment approaches for breast cancer, including approaches focused on tailoring therapy for early stage HER2+ disease, use of cdk 4/6 inhibitors, antibody drug conjugates, and immunotherapy.She is a member of the National Cancer Institute Breast Cancer Steering Committee and is Vice Chair for Late-Stage Development in Breast Cancer in the Alliance for Clinical Trials in Oncology. Her research has been funded by the Breast Cancer Research Foundation and Susan G. Komen. She currently chairs multiple phase 3 trials in breast cancer and serves on several steering committees for practice-changing trials.  Her work has been published in journals such as the New England Journal of Medicine, Lancet, Lancet Oncology, Journal of Clinical Oncology, and others. She received her undergraduate degree from Princeton University in 1998 and her medical degree from UC San Francisco in 2002. She subsequently completed her residency in Internal Medicine at Johns Hopkins University, and fellowships in hematology and medical oncology at Dana-Farber Cancer Institute. She obtained a Masters in Public Health from the Harvard School of Public Health in 2007. In 2008, she joined the staff of Dana-Farber Cancer Institute and Brigham and Women's Hospital. Dr. Tolaney is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. She is also highly rated in 16 other conditions, according to our data. Her clinical expertise encompasses Breast Cancer, HER-2 Positive Breast Cancer, Inflammatory Breast Cancer, and Triple-Negative Breast Cancer. Dr. Tolaney is board certified in Medical Oncology.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer

    Duke Cancer Center

    20 Duke Medicine Cir, 
    Durham, NC 
    Experience:
    24+ years
    Languages Spoken:
    English
    Offers Telehealth

    My clinical practice if focused on the care of patients with breast cancer, particularly those diagnosed at a younger age and those with recurrence in the central nervous system. I am committed to the care of patients with breast cancer brain metastases, and I am honored to serve as the Medical Director of the Brain and Spine Metastases Program in the Duke Cancer Center. In this role, our multidisciplinary team provides well-coordinated care for patients with breast cancer and other solid tumor types that have metastasized to the central nervous system. In addition, I enjoy helping young women diagnosed with breast cancer navigate their treatment decisions to ensure both excellent medical care and attention to individual challenges, such as future fertility, sequelae of treatment on longer-term health, and impact on current and future relationships. When not working, I enjoy running, reading, and traveling with my family. Dr. Anders is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. She is also highly rated in 10 other conditions, according to our data. Her clinical expertise encompasses Breast Cancer, Brain Tumor, Triple-Negative Breast Cancer, and Metastatic Brain Tumor.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer

    Brigham And Women's Hospital, Division Of Breast Surgery

    75 Francis Street, 
    Boston, MA 
    Languages Spoken:
    English

    Dr. Lin is a medical oncologist specializing in the care of patients with all stages of breast cancer. Her research focuses upon improving the outcomes of people living with metastatic breast cancer, including a particular focus on the challenge of breast cancer brain metastases. She has led multiple clinical trials which have led to new treatment options for patients with breast cancer that has metastasized to the brain. Dr. Lin received her MD from Harvard Medical School in 1999. She completed her residency in internal medicine at Brigham and Women's Hospital and went on to complete fellowships in medical oncology and hematology at Dana-Farber. In 2005, she joined the staff of Brigham and Women's and Dana-Farber, where she is a medical oncologist and clinical investigator in the Breast Oncology Center. Dr. Lin is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. She is also highly rated in 13 other conditions, according to our data. Her clinical expertise encompasses Breast Cancer, HER-2 Positive Breast Cancer, Brain Tumor, and Inflammatory Breast Cancer. Dr. Lin is board certified in Medical Oncology.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer

    Dana-Farber Cancer Institute, Breast Oncology Program

    450 Brookline Avenue, Susan F. Smith Center For Women's Cancers, 
    Boston, MA 
    Languages Spoken:
    English
    Offers Telehealth

    Dr. Lynce received her medical degree from the Universidade Nova de Lisboa, Portugal in 2004. She completed her residency in Internal Medicine and fellowship in Hematology and Medical Oncology at MedStar Washington Hospital Center/MedStar Georgetown University Hospital in Washington, DC. She was faculty at MedStar Georgetown University Hospital from 2015 to 2020 where she served as the institutional PI for Alliance and the co-PI for the National Capital Area (NCA) Minority/Underserved NCORP. In 2020, she joined the staff of Dana-Farber Cancer Institute and Brigham and Women's Hospital, where she is a medical oncologist and clinical investigator in the Breast Oncology Center. Her research focuses on inflammatory breast cancer, triple-negative breast cancer, BRCA-associated breast cancers and novel therapies in the treatment of breast cancer. Dr. Lynce is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. She is also highly rated in 8 other conditions, according to our data. Her clinical expertise encompasses Inflammatory Breast Cancer, Breast Cancer, Triple-Negative Breast Cancer, Angiosarcoma, and Salpingo-Oophorectomy. Dr. Lynce is board certified in Medical Oncology.

    Elite in Triple-Negative Breast Cancer
    Hematology Oncology
    Elite in Triple-Negative Breast Cancer
    Hematology Oncology

    UPMC Hillman Cancer Center

    300 Halket Street, Suite 4628, 
    Pittsburgh, PA 
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Adam M. Brufsky, MD, PhD, FACP, is professor of medicine at the University of Pittsburgh School of Medicine and also serves as the associate division chief for the Division of Hematology/Oncology at the University of Pittsburgh School of Medicine's Department of Medicine. Dr. Brufsky is the medical director of the Magee-Women's Cancer Program, part of the UPMC Hillman Cancer Center, and UPMC Hillman Cancer Center; associate director for clinical investigations at UPMC Hillman Cancer Center; and codirector of the Comprehensive Breast Cancer Center.Dr. Brufsky is board-certified in internal medicine and medical oncology. He earned a medical and doctor of philosophy degrees from the University of Connecticut School of Medicine in Farmington, Conn.; completed a residency at Brigham and Women's Hospital, Harvard Medical School, and a fellowship at Dana-Farber Cancer Institute.Dr. Brufsky is a member of professional organizations, such as American Medical Association, Massachusetts Medical Society, American College of Physicians, American Society of Clinical Oncology, American Association for Cancer Research, Allegheny County Medical Society, Pennsylvania Medical Society, and Pennsylvania Oncologic Society. An active researcher, Dr. Brufsky has numerous abstracts and research articles in leading journals, and is principal investigator on a number of research grants funded by the National Institutes of Health, Susan G. Komen Foundation, and US Army - Breast Cancer Research Program. Dr. Brufsky is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. He is also highly rated in 15 other conditions, according to our data. His clinical expertise encompasses Breast Cancer, Triple-Negative Breast Cancer, Inflammatory Breast Cancer, Breast Cancer in Men, and Gastrostomy. Dr. Brufsky is board certified in American Board Of Internal Medicine and American Board Of Internal Medicine. Dr. Brufsky is currently accepting new patients.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer

    Johns Hopkins Health Care & Surgery Center - Green Spring Station, Lutherville

    Lutherville, MD 
    Languages Spoken:
    English, French, Portuguese, Spanish
    Offers Telehealth

    Dr. Antonio Wolff is internationally recognized for his work on breast cancer biomarkers, including HER2. As a practicing oncologist and clinical translational researcher, his research has been pivotal to improve the quality of breast cancer biomarker testing in breast cancer, including HER2 and estrogen receptor testing. Among his leadership accomplishments is ensuring that sophisticated laboratory findings are translated into improved clinical care in breast cancer. He is a Fellow of the American Society of Clinical Oncology (ASCO), a Komen Scholar and a Breast Cancer Research Foundation investigator. He has served as associate editor for Journal of Clinical Oncology, and serves on the National Comprehensive Cancer Network (NCCN) Guideline Steering Committee. He is a leader of the Translational Breast Cancer Research Consortium (TBCRC), and one of the principal investigators of the Evolutionary Clinical Trial for Novel Biomarker-Driven Therapies (EVOLVE) in Metastatic Breast Cancer, which was one of the three disease groups recently awarded by ARPA-H to conduct innovative trials using Advanced Analysis for Precision Cancer Therapy (ADAPT). After many years of service as Breast Committee Chair in the ECOG-ACRIN Clinical Trial Network of the National Cancer Institute (NCI), he was elected in 2024 as Co-Chair of the NCI Breast Cancer Steering Committee and appointed to the international steering committee of the Oxford Overview Collaborative, which are positions aimed at advancing clinical trials in breast cancer. At Johns Hopkins, he is an elected member of the Miller Coulson Academy of Clinical Excellence and was honored during the 125th Anniversary Living the Hopkins Mission celebrations of the JHU School of Medicine. Dr. Wolff is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. He is also highly rated in 8 other conditions, according to our data. His clinical expertise encompasses Breast Cancer, HER-2 Positive Breast Cancer, Triple-Negative Breast Cancer, and Inflammatory Breast Cancer. Dr. Wolff is board certified in American Board Of Internal Medicine.

    Elite in Triple-Negative Breast Cancer
    Endocrinology
    Elite in Triple-Negative Breast Cancer
    Endocrinology

    Office

    150 S Liberty St, 
    New Orleans, LA 
    Languages Spoken:
    English

    Bridgette Collins is an Endocrinologist practicing medicine in New Orleans, Louisiana. Dr. Collins is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. She is also highly rated in 5 other conditions, according to our data. Her clinical expertise encompasses Triple-Negative Breast Cancer, Breast Cancer, Paget Disease of the Breast, and Inflammatory Breast Cancer.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer

    Yale New Haven Hospital

    20 York St, 
    New Haven, CT 
    Languages Spoken:
    English

    Lajos Pusztai is an Oncologist practicing medicine in New Haven, Connecticut. Dr. Pusztai is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. He is also highly rated in 8 other conditions, according to our data. His clinical expertise encompasses Triple-Negative Breast Cancer, Breast Cancer, Inflammatory Breast Cancer, PIK3CA-Related Overgrowth Spectrum, and Tissue Biopsy.

    Elite in Triple-Negative Breast Cancer
    Oncology
    Elite in Triple-Negative Breast Cancer
    Oncology

    Breast Care Center

    1825 4th St Fl 3, 
    San Francisco, CA 
    Languages Spoken:
    English
    Offers Telehealth

    Hope Rugo is an Oncologist practicing medicine in San Francisco, California. Dr. Rugo is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. She is also highly rated in 19 other conditions, according to our data. Her clinical expertise encompasses Breast Cancer, Triple-Negative Breast Cancer, PIK3CA-Related Overgrowth Spectrum, Bone Marrow Aspiration, and Hormone Replacement Therapy (HRT).

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer

    Universita Degli Studi Di Milano

    Milan, IT 

    Giuseppe Curigliano practices practicing medicine in Milan, Italy. Mr. Curigliano is rated as an Elite expert by MediFind in the treatment of Triple-Negative Breast Cancer. He is also highly rated in 25 other conditions, according to our data. His clinical expertise encompasses Breast Cancer, Triple-Negative Breast Cancer, HER-2 Positive Breast Cancer, Mastectomy, and Tissue Biopsy.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer
    Martin Behaim Str 12, 
    Neu Isenburg, HE, DE 

    Sibylle Loibl practices practicing medicine in Neu Isenburg, Germany. Ms. Loibl is rated as an Elite expert by MediFind in the treatment of Triple-Negative Breast Cancer. She is also highly rated in 17 other conditions, according to our data. Her clinical expertise encompasses Breast Cancer, PIK3CA-Related Overgrowth Spectrum, Triple-Negative Breast Cancer, Breast Cancer in Men, and Mastectomy.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer

    Medizinisches Zentrum Bonn Friedensplatz

    Bonn, NW, DE 

    Michael Untch practices practicing medicine in Bonn, Germany. Mr. Untch is rated as an Elite expert by MediFind in the treatment of Triple-Negative Breast Cancer. He is also highly rated in 15 other conditions, according to our data. His clinical expertise encompasses Breast Cancer, Triple-Negative Breast Cancer, HER2 Negative Breast Cancer, Mastectomy, and Salpingo-Oophorectomy.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer
    Heidelberg, BW, DE 

    Andreas Schneeweiss practices practicing medicine in Heidelberg, Germany. Mr. Schneeweiss is rated as an Elite expert by MediFind in the treatment of Triple-Negative Breast Cancer. He is also highly rated in 16 other conditions, according to our data. His clinical expertise encompasses Breast Cancer, Triple-Negative Breast Cancer, HER2 Negative Breast Cancer, PIK3CA-Related Overgrowth Spectrum, and Mastectomy.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer

    Massachusetts General Hospital

    55 Fruit St, 
    Boston, MA 
    Languages Spoken:
    English
    Offers Telehealth

    Aditya Bardia is an Oncologist practicing medicine in Boston, Massachusetts. Dr. Bardia is rated as an Elite provider by MediFind in the treatment of Triple-Negative Breast Cancer. He is also highly rated in 11 other conditions, according to our data. His clinical expertise encompasses Breast Cancer, PIK3CA-Related Overgrowth Spectrum, Triple-Negative Breast Cancer, Agranulocytosis, and Tissue Biopsy.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer
    Paris, FR 

    Anne Salomon-Vincent practices practicing medicine in Paris, France. Salomon-Vincent is rated as an Elite expert by MediFind in the treatment of Triple-Negative Breast Cancer. They are also highly rated in 9 other conditions, according to our data. Their clinical expertise encompasses Breast Cancer, Triple-Negative Breast Cancer, PIK3CA-Related Overgrowth Spectrum, Mastectomy, and Salpingo-Oophorectomy.

    Elite in Triple-Negative Breast Cancer
    Elite in Triple-Negative Breast Cancer
    Kerpener Str. 34, 
    Koeln, NW, DE 

    Nadia Harbeck practices practicing medicine in Koeln, Germany. Ms. Harbeck is rated as an Elite expert by MediFind in the treatment of Triple-Negative Breast Cancer. She is also highly rated in 15 other conditions, according to our data. Her clinical expertise encompasses Breast Cancer, PIK3CA-Related Overgrowth Spectrum, Triple-Negative Breast Cancer, Agranulocytosis, and Mastectomy.

    Showing 1-20 of 18,213

    Last Updated: 04/28/2026

    What is the definition of Triple-Negative Breast Cancer?

    Triple-negative breast cancer (TNBC), a subtype of breast cancer, is a rare, malignant breast disease that lacks receptors for the hormones estrogen and progesterone and the human epidermal growth factor (HER2) protein usually found in other breast cancers. An aggressive cancer, triple-negative breast cancer grows and spreads more quickly than other types of invasive breast cancer. Triple-negative breast cancer is also more likely to reoccur and has a worse outcome (prognosis) than other breast cancers. Triple-negative breast cancer accounts for 10-15% of all breast cancers and is more common in women under the age of 40 who are African American or Hispanic, and who carry the BRCA1 gene mutation. Seventy percent of breast cancers in individuals with a BRCA gene mutation are triple-negative. Triple-negative breast cancer is classified in the following stages: Stage 0 – Ductal cancer in situ (DCIS), which is a non-invasive breast cancer. The cancer cells are still located in a breast duct and have not spread. Stage 1A – The breast cancer tumor is 2 centimeters or smaller and has not spread. Stage 1B – The tumor is 2 centimeters or smaller (or undetectable) with microscopic spread (micrometastases) into one-to-three axillary (underarm) lymph nodes. The metastasis is more than .2 millimeters but less than 2 millimeters and has not spread to other parts of the body. Stage IIA – One of the following has occurred, and the cancer has not spread beyond the lymph nodes: 1) The tumor is 2 centimeters (or undetectable) and has spread to one-to-three axillary (underarm) lymph nodes, with the cancer in the lymph nodes greater than 2 millimeters; 2) the tumor is 2 centimeters or smaller (or undetectable) and microscopic cancer is found in the internal mammary (breast) lymph nodes; 3) the tumor is 2 centimeters or smaller (or undetectable) and has spread to one-to-three axillary (underarm) lymph nodes and the internal mammary (breast) lymph nodes; or 4) the tumor is greater than 2 centimeters but less than 5 centimeters, but has not spread to lymph nodes. Stage IIB – One of the following has occurred, and the cancer has not spread beyond the lymph nodes: 1) the tumor is larger than 2 centimeters but less than 5 centimeters and has spread to one-to-three axillary (underarm) lymph nodes, and microscopic cancer is found in the internal mammary (breast) lymph nodes; or 2) the tumor is larger than 5 centimeters but has not invaded the chest wall or skin. Stage IIIA – One of the following has occurred, and the cancer has not spread beyond the lymph nodes: 1) the tumor is less than 5 centimeters (or undetectable) and has spread to four-to-nine axillary (underarm) lymph nodes; or 2) the tumor is greater than 5 centimeters, has not invaded the chest wall or skin, but has spread to one-to-nine axillary (underarm) lymph nodes or internal mammary (breast) nodes. Stage IIIB – The tumor has invaded the chest wall or skin, but hasn’t spread to other parts of the body, and one of the following has occurred: 1) the tumor has not spread to the lymph nodes; 2) the tumor has spread to one-to-three axillary (underarm) lymph nodes, and microscopic cancer has spread to the internal mammary (breast) nodes; or 3) the tumor has spread to four-to-nine axillary (underarm) lymph nodes, or it has caused swelling in the internal mammary (breast) nodes. Stage IIIC – The tumor is any size (or undetectable), had not spread beyond the lymph nodes, and one of the following has occurred: 1) the cancer has spread to 10 or more axillary (underarm) nodes; 2) the cancer has spread to the lymph nodes under the clavicle (collar bone); the cancer has spread to the lymph nodes above the collarbone; 3) the cancer has spread to axillary (underarm) lymph nodes; or 4) the cancer has spread to four or more axillary (underarm) lymph nodes, and microscopic cancer is found in internal mammary (breast) lymph nodes. Stage IV – The cancer is any size and may or may not have spread to close lymph nodes, but it has spread to organs such as the liver, lung, brain, or bones, or other distant lymph nodes.