NorthMain Radiation Oncology - Providence, RI

825 North Main St, Providence, RI 02904

Phone. (401) 521-9700Fax. (401) 331-6718

About Us

At NorthMain Radiation Oncology, we believe that excellent care begins with a skilled and compassionate team of individuals. We have assembled an unmatched team of healthcare professionals dedicated to providing you with the best possible care and services. Your caregiving team consists of a Radiation Oncologist, Radiation Therapists, the Radiation Oncology Nurse, Medical Physicist and a Dosimetrist. Each is committed to you as a patient, treating you as family, and ensuring you are supported from diagnosis to recovery.

NorthMain Radiation Oncology is part of The US Oncology Network (“The Network”), a community of more than 1,200 affiliated physicians with expertise in medical oncology, hematology, radiation oncology, gynecologic oncology, urology, oncology surgery and other specialties. We believe local cancer care is better care. Practices in The Network deliver advanced integrated cancer care supported by a network of independent physicians who share expertise and resources to provide quality, value-based care close to home. The Network practices have more than 400 sites of care in over 25 states and treat over 850,000 patients annually. The Network is supported by McKesson Specialty Health, an industry leader in solutions that empower the community patient care delivery system to advance the science, technology and quality of care.

Our Cancer Care Specialists

Nicklas Oldenburg

Nicklas Oldenburg, MD, is the medical director at NorthMain Radiation Oncology.  He specializes in intensity-modulated radiation therapy and prostate brachytherapy.  He has a special interest in the treatment of prostate cancer and gastrointestinal malignancies.

Dr. Oldenburg believes in treating patients the same way he would like to be treated.  He calls patients with results right away to reduce the anxiety of waiting and believes strongly in the level of care every healthcare professional at NorthMain provides. In his free time, Dr. Oldenburg enjoys gardening, and plants his own vegetable garden every spring.

  • Physician at Beth Israel Deaconess Medical Center Instructor at Harvard Medical School (2000 to 2002)
  • Areas of interest – Prostate and gastrointestinal cancers Extensive experience – Prostate implants and IMRT
See Credentials
  • Medical School: University of North Carolina
  • Internship: Beth Israel Hospital
  • Residency: Chief Resident - Harvard Joint Center for Radiation Therapy
  • Board Certification: Board-Certified Radiation Oncologist

Donald Joyce

Donald Joyce, MD, has 25 years of experience treating many different cancers. He joined NorthMain Radiation Oncology in 1997. His expertise includes prostate, lung, and head and neck cancers. He has extensive experience with implants for prostate cancer, intensity-modulated radiation therapy and stereotactic radiation body therapy. Dr. Joyce is an army veteran and well-equipped to treat local VA patients. Dr. Joyce became an oncologist because he genuinely enjoys patient contact. He finds his work extremely rewarding and believes in empathetic care where he puts himself in his patients’ shoes. In his free time, he enjoys traveling with his family to his favorite destinations, Hawaii and Ireland.


  • Served in the U.S. Army Medical Service
  • Chief of the internal medicine clinic
  • Areas of interest – Prostate, lung, and head and neck cancers
  • Extensive experience – IMRT and SBRT
See Credentials
  • Medical School: Georgetown University
  • Internship: Walter Reed Army Medical Center
  • Residency: Walter Reed Army Medical Center
  • Board Certification: Board-Certified Radiation Oncologist

Kathy Radie-Keane

Kathy Radie-Keane, MD, named Top Doctor in Rhode Island, believes in providing every patient with the most compassionate and best quality care. She originally became a doctor to do her part in curing cancer and improving quality of life for her patients. Dr. Radie-Keane believes in putting herself in her patients’ shoes and treating them the way she would like to be treated.

She is married to her husband of 35 years and they have two beautiful daughters. She believes family is everything, and in her spare time enjoys reading, exercising, knitting, and cooking.

  • Areas of interest – Breast and gynecologic cancers
  • Extensive experience – IMRT and SBRT
See Credentials
  • Medical School: Tufts University School of Medicine
  • Internship: Salem Hospital
  • Residency: Chief Resident - Tufts-New England Medical Center, Medical College of Virginia
  • Board Certification: Board-Certified Radiation Oncologist

Our Cancer Care Technologies

Your First Appointment

825 North Main St, Providence, RI 02904

Phone. (401) 521-9700 Fax. (401) 331-6718

Please arrive 15 minutes prior to your scheduled appointment and bring the following:

  • Other doctor’s names and phone numbers
  • Insurance cards
  • Medical history
  • List of medications you are currently taking
  • Driver’s license, military ID or passport for photo identification

We provide assistance with insurance including pre-authorization, pre-certification for services, and assistance determining benefits. Please call if you have any questions. 

Click Here to Download our New Patient Checklist

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