Medical Oncology Fellowship Program

Cancer Treatment Centers of America® (CTCA), Tulsa is proud to offer a two-year American Osteopathic Association (AOA) accredited Medical Oncology Fellowship to train the next generation of medical oncologists. Beginning in July of each year, this program prepares fellows to successfully manage solid tumors and malignant hematology in a clinical setting. Fellows accepted into the program are placed full-time at CTCA in Tulsa and will be exposed to the following learning objectives over the course of the two-year training.

Program Objectives:

  • Management of complex malignancies and multiple malignancies occurring in patients
  • Integration of osteopathic principles into the diagnosis and management of patient clinical presentations
  • Involvement in multi-modality tumor conferences, intake meetings, lecture programs, oncology journal club and clinical teaching rounds
  • Demonstrated thorough knowledge of the complex differential diagnoses and treatment options of oncology as well as the ability to provide end-of-life care
  • Involvement in clinical trials and research methods
  • Presentations at clinical conferences
  • Identification of the ethnic, religious, and cultural aspects of illness and their impact on patient clinical presentation and subsequent management
  • Knowledge of national and local healthcare delivery systems and how they impact patient care and professional practice

Program Components

  • The fellowship’s primary focus will center on the management and treatment of breast, lung, prostate and colon cancers in addition to several rare forms of tumors, including sarcomas. Exposure to leukemias and lymphomas will occur as part of the Stem Cell Transplant Unit training.
  • Fellows may choose from program electives in the areas of radiation oncology, gastrointestinal oncology, pulmonary oncology, interventional radiology and palliative care. Research opportunities will be integrated into the fellowship curriculum, including instruction on research methods as well as participation in research and clinical trials.
  • Additional opportunities and exposure can be customized and incorporated into the program based on the interest of the fellow.


  • Osteopathic applicants must have completed an ACGME or AOA Internal Medicine Residency program and be board eligible prior to entrance into the fellowship program.

Applying for the CTCA Medical Oncology Fellowship

Interested applicants should apply through the Electronic Residency Application System (ERAS); all applications must be received by October 1st for acceptance into the following year’s fellowship program. In addition, all applicants must be prepared to submit:

  • Four Letters of Recommendation
  • Curriculum Vitae
  • Personal Statement
  • Medical Student Performance Evaluation (MSPE)
  • Medical School Transcript
  • USMLE Transcript (optional)
  • COMLEX-USA Transcript (optional)


  • Dr. Sagun Shrestha (Click to Expand)

    Dr. Shrestha received her medical education at the Maulana Azad Medical College in New Delhi, India. She was Chief Medical Resident at the Jamaica Hospital Medical Center in New York and chief fellow in the Division of Hematology-Oncology at the Long Island Jewish Medical Center, Albert Einstein College of Medicine in New Hyde Park, New York. She is board certified in medical oncology.

    Areas of Interest:
    Breast, uterine and cervix cancers in addition to other gynecological malignancies

  • Dr. Theodore W. Pollock (Click to Expand)

    Dr. Pollock brings more than 30 years of oncology experience to his practice. He earned a medical degree from Kirksville College of Osteopathic Medicine. Dr. Pollock then completed an internship and residency at Doctors Hospital in Columbus, Ohio, as well as a medical oncology fellowship at Memorial Sloan-Kettering Cancer Center in New York. After his fellowship, Dr. Pollock returned to Columbus, where he spent 25 years providing care to cancer patients in a private practice setting. He is board certified in medical oncology and hematology.

    Areas of Interest:
    Prostate, lung and colorectal malignancies

  • Dr. Leon Yoder (Click to Expand)

    Board certified in gastroenterology by the American Board of Internal Medicine and the American College of Osteopathic Internists, Dr. Yoder earned a medical degree from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine. He completed a residency in internal medicine at Veterans Hospital in Dayton, Ohio, followed by a fellowship in gastroenterology at the University of Colorado Medical Center.

    Areas of Interest:
    Hepatobiliary disorders, involving pancreatic and esophageal cancers

  • Dr. Maurie Markman (Click to Expand)

    Dr. Maurie Markman, MD – President of Medicine and Science

    Dr. Markman is a nationally-renowned oncologist, and is the President of Medicine and Science at Cancer Treatment Centers of America (CTCA). He has more than 20 years of experience in cancer treatment and gynecologic research at some of the country’s most recognized facilities. A Diplomate of the American Board of Internal Medicine, Dr. Markman is board certified in internal medicine, medical oncology and hematology.

  • Dr. Istvan Redei (Click to Expand)

    Dr. Istvan Redei, MD – Chief, Division of Stem Cell Transplantation, Department of Medical Oncology

    Dr. Redei heads the Stem Cell Transplant and Cell Therapy Program at the hospital and leads enterprise-wide development of stem cell and transplant services as Chief of the Division of Stem Cell Transplantation at CTCA®. Board certified in hematology, Dr. Redei received his medical degree from Semmelweis University in Budapest, Hungary. He then went on to complete his residency at New York Medical College. He completed a fellowship in hematology at Temple University and a fellowship in oncology at Fox Chase Cancer Center, both in Philadelphia.

  • Dr. Michael Kayser (Click to Expand)

    Dr. Michael Kayser, DO, FACMG – Medical Director of Genetic Services

    Dr. Kayser is the Medical Director of Genetic Services at Cancer Treatment Centers of America® (CTCA), Tulsa. A fellow of the American College of Medical Genetics, Dr. Kayser is board certified in clinical genetics and clinical biochemical genetics. Dr. Kayser earned a Doctor of Osteopathic Medicine degree from Oklahoma State University (OSU) College of Osteopathic Medicine in Tulsa, where he subsequently completed a medical internship at OSU Medical Center.

  • Dr. Cynthia Holmes (Click to Expand)

    Dr. Cynthia Holmes, MD – Pathologist

    Dr. Holmes is pathologist at Cancer Treatment Centers of America® (CTCA), Tulsa. She graduated with honors from the University of Oklahoma College of Medicine in 1996. Dr. Holmes has more than 20 years of diverse experience, especially in pathology.

  • Dr. Ricardo Alvarez (Click to Expand)

    Dr. Ricardo Alvarez, MD, MSc – Director of Cancer Research & Breast Medical Oncologist

    Dr. Alvarez is a world-renowned oncologist at Southeastern Regional Medical Center in Atlanta, Georgia. Licensed to practice medicine by the states of Georgia and Texas, Dr. Alvarez is board certified in internal medicine and medical oncology by the American Board of Internal Medicine.

  • Dr. Asha Karippot (Click to Expand)

    Dr. Asha Karippot, MD - Hematology/Oncology

    Dr. Asha Karippot joined Cancer Treatment Centers of America® (CTCA) in Tulsa, Oklahoma, in July 2017. She is an experienced oncologist, and is board certified in internal medicine, medical oncology and hematology. As a Medical Oncologist and Hematologist at CTCA®, Dr. Karippot sees a variety of cancer patients while focusing on patients with colon, breast and lung cancer.

  • Dr. Scott Hendrickson (Click to Expand)

    Dr. Scott Hendrickson, DO, FACOI – Gastroenterologist and Medical Director of Metabolic Services

    Dr. Hendrickson completed his Doctor of Osteopathic Medicine Degree at Oklahoma State University College of Osteopathic Medicine in 1998. A member of the American College of Gastroenterology, the American Osteopathic Association, the Oklahoma Osteopathic Association, the Tulsa Osteopathic Medical Society, the Osteopathic Founders Foundation and the American College of Osteopathic Internists, Dr. Hendrickson is board certified in internal medicine and gastroenterology by the American Osteopathic Board of Internal Medicine.

CTCA Medical Oncology Fellowship Program Benefits

CTCA provides a competitive compensation and benefits package for fellows accepted into the program. For specific details regarding CTCA benefits, please contact one of the program liaisons below.

To learn more about the CTCA in Tulsa Medical Oncology Fellowship or for questions about the program, please contact:

Pam Knight
Program Coordinator
(918) 286-5976
Josie Starnella
Manager, Physician Services
(918) 286-5131
Ryan Crawford
VP, Talent, Physician & Pharmacy Services
(918) 286-5579