Longmont Breast Specialists

1760 E. Ken Pratt Blvd. Ste. 301
Longmont, CO 80504

Phone: 303-684-1877
Fax: 303-267-4470

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  • Breast Cancer Surgery
  • Breast-Conserving Surgery
  • Chemotherapy
  • Clinical Research Trials
  • Hormone Therapy
  • Immunotherapy
  • Lymph Node Surgery
  • Oncoplastic Surgery
  • Targeted Therapy


  • Advance Care Planning
  • Diagnostic Imaging
  • High-Risk Assessment Clinic
  • Infusion Suite
  • Laboratory Services
  • Medically Integrated Pharmacy
  • Nursing Triage
  • Patient Financial Counseling
  • Supportive Care Counseling and Education
  • Survivorship and Support Groups

Physicians at this location:

Medical Oncologist / Hematologist

Kelly Casteel, MD

Kelly Casteel, MD

Sara Robinson, MD

Sara Robinson, MD

Breast Surgical Oncology

Gerlinde Tynan, MD, FACS

Gerlinde Tynan, MD, FACS


Welcome to Rocky Mountain Breast Specialists in Longmont, a breast cancer treatment center located at 1760 E. Ken Pratt Blvd. Ste. 301 in the new Medical Office Building at Longs Peak Hospital, where we have a dedicated multidisciplinary team of cancer providers offering expertise in all areas of breast care. These breast specialists are experts in advanced cancer treatment therapies and comprehensive supportive care to provide a total breast cancer treatment program.

Treatments offered at this clinic include chemotherapy, hormone therapy, immunotherapy, radiation therapy, and targeted therapy. We also provide our patients with a variety of cancer care services such as diagnostic imaging, laboratory services, and a medically integrated pharmacy.

We are proud to give our patients access to the latest treatments, an extensive clinical trial research program, education and support services, and expert guidance from our specially-trained and board-certified physicians. Our multidisciplinary team of breast specialists includes recognized experts in areas such as breast surgical specialists, medical oncologists, radiation oncologists, and supportive care team members— all who collaborate to deliver an unparalleled standard of care in Longmont, Colorado.

Parking: Our office is in the medical office building at the corner of East Ken Pratt Blvd/Hwy 119 and County Line Road on the Longs Peak Hospital Complex. Access to the hospital complex is available off East Ken Pratt Blvd onto Ludlow St at the west end of the complex (opposite end of the complex from our building). Drivers can either proceed straight on Ludlow St to Thayer Ave and turn right or turn right immediately into the hospital complex and take the outside loop around the parking lots. Access to the medical complex off County Line Road is only available for southbound drivers. You will not be able to turn left into the parking lot from County Line Road. Parking is available in lots to the north, east, and south of the medical office building.