Radiation Oncology

21st Century Oncology provides state-of-the-art, academic quality radiation therapy and other cancer treatments.

Our treatment centers offer our patients a full spectrum of radiation therapy—which is used to treat the most common types of cancers, including prostate, breast, lung and colorectal. Radiation is either given externally or internally, and some cancers require both treatments. 21st Century Oncology uses the latest technology, including:

  • TrueBeam
  • RapidArc
  • Calypso
  • TomoTherapy
  • Trilogy
  • Mammosite

To learn more about 21st Century Oncology, visit www.21stcenturyoncology.com.

Image: Alan Brown, M.D. | Radiation Oncology - Southwest Florida Regional Cancer Center
Alan Brown, M.D.
Dr. Alan Brown earned his medical degree at the University of Michigan, and completed his postgraduate residency training in radiation oncology at Massachusetts General Hospital in Boston. He completed research in breast cancer incidence and age distribution in minorities and has done work with BOLD MR Imaging, which allows assessment of reductions in tumor oxygen supply. Dr. Brown specializes in conformal 3-D radiation therapy, intensity modulated radiation therapy (IMRT), stereotactic radiosurgery (SRS), proton irradiation, high dose rate brachytherapy and permanent brachytherapy (seed implants). He has a particular interest in central nervous system, gastrointestinal, genitourinary, lung and breast malignancies.
Image: Daniel Dorosetz, MD | Radiation Oncology - Southwest Florida Regional Cancer Center
Daniel E. Dosoretz, M.D.
Dr. Daniel Dosoretz earned his medical degree at the University of Buenos Aires School of Medicine and completed his internship in Bethesda, Md. He trained in radiation oncology at the Department of Radiation Medicine at Massachusetts General Hospital, Harvard Medical School. He is board certified in therapeutic radiology by the American Board of Radiology. Dr. Dosoretz is a Fellow of the American College of Radiation Oncology (ACRO), a Fellow of the American College of Radiology, a member of the International Stereotactic Radiosurgery Society, the American Society for Therapeutic Radiology and Oncology and the American Society of Clinical Oncology.
Image: Arie Dorosetz, MD | Radiation Oncology - Southwest Florida Regional Cancer Center
Arie Dosoretz, M.D.
Dr. Arie Dosoretz earned his Bachelor of Arts in biological basis of behavior and his medical degree at the University of Pennsylvania in Philadelphia. He also earned a Masters of Business Administration in Health Care Management at The Wharton School of the University of Pennsylvania. He completed an internal medicine internship and a radiation oncology residency at Yale-New Haven Hospital in New Haven, Conn. Dr. Dosoretz is a member of the American Medical Association, the American Society of Clinical Oncology, and the American Society for Therapeutic Radiology and Oncology. His areas of expertise include prostate, breast and lung cancer, as well as stereotactic radiotherapy.
Amy Fox, MD | Radiation Oncology - Southwest Florida Regional Cancer Center
Amy M. Fox, M.D.
Dr. Amy Fox earned her medical degree at Mount Sinai School of Medicine in New York, N.Y. She also completed an internship in the Department of Medicine at Mount Auburn Hospital in Cambridge, Mass., and a residency in radiation oncology at the Harvard Radiation Oncology Program. Dr. Fox is a member of the American Medical Association, the American Society of Clinical Oncology, and the American Society for Therapeutic Radiology and Oncology.
Image: Michael Katin, MD - Southwest Florida Regional Cancer Center
Michael J. Katin, M.D.
Dr. Michael Katin earned his medical degree at University of Pennsylvania School of Medicine in Philadelphia. He completed an internal medicine internship and residency at Lankenau Hospital in Philadelphia, as well as a radiation medicine residency at Massachusetts General Hospital in Boston. Dr. Katin also completed a renal and electrolyte disorders fellowship at Lankenau Hospital; a medical oncology fellowship at Roswell Park Memorial Institute; and a medical oncology and hematology fellowship at the National Cancer Institute/National Institute of Health in Bethesda, Md. A radiation oncologist, Dr. Katin is board certified in medical oncology, geriatric medicine, hematology, internal medicine and therapeutic radiology.
Image: Constantine Mantz, MD | Radiation Oncology - Southwest Florida Regional Cancer Center
Constantine A. Mantz, M.D.
Dr. Constantine Mantz earned his medical degree from the University of Chicago’s Pritzker School of Medicine and completed a surgical internship at the Hennepin County Medical Center in Minneapolis. Dr. Mantz completed a radiation oncology residency at the University of Chicago Hospitals. He is board certified in radiation oncology by the American Board of Radiology and is a member of the American College of Radiation Oncology, the American Medical Association, the American Society for Therapeutic Radiology and Oncology (ASTRO) and the Association of Freestanding Radiation Oncology Centers. Dr. Mantz has a special interest in the study and treatment of prostate cancer.
Image: Keith Miller, MD | Radiation Oncology - Southwest Florida Regional Cancer Center
Keith L. Miller, M.D.
Dr. Keith Miller earned his medical degree from the University of California, San Diego. Prior to completing a residency in radiation oncology at Duke University in Durham, N.C., Dr. Miller was trained in internal medicine and pulmonary and critical care. He is board certified in internal medicine, pulmonary and critical care, and radiation oncology. Dr. Miller is a Fellow of the American College of Chest Pain Physicians, a member of the American Society for Therapeutic Radiology and Oncology, the American Society of Clinical Oncology, the American Medical Association and the American College of Radiation Oncology.
Image: James Rubenstein, MD - Southwest Florida Regional Cancer Center
James H. Rubenstein, M.D.
Dr. James Rubenstein earned his medical degree at New York University School of Medicine in New York. He completed an internal medicine internship and residency at Beth Israel Hospital in Boston, as well as a radiation oncology residency at the Hospital of the University of Pennsylvania in Philadelphia. Dr. Rubenstein is board certified in internal medicine and radiation oncology and is past president of the American College of Radiation Oncology.
Image: Patient Care | Radiation Oncology - Southwest Florida Regional Cancer Center

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