Skip to main content

Marcus Butler, MD

CCTG Melanoma Committee Chair

Dr. Butler is the Medical Oncologist at the Princess Margaret Cancer Centre in Toronto, Canada and is Assistant Professor at the University of Toronto. Dr Butler received his MD from Yale University and completed his training in Internal Medicine at Johns Hopkins Hospital and Medical Oncology at the Dana-Farber Cancer Institute, Brigham and Women’s and Mass General Hospitals.  He is the Medical Oncology Lead for Melanoma/Skin Oncology at the Princess Margaret Centre, University Health Network. He is also a member of the Princess Margaret Tumor Immunotherapy Program and is the Clinical Head of the Immune Monitoring Team at the Princess Margaret, where his group performs a wide variety of immunologic assays to examine the impact of therapies on immune phenotype and function. Dr. Butler’s research focus is on the development of novel therapies and clinical trials that include targeted therapy, immune modulation and adoptive T-cell therapy.

“Patients that participate on clinical trials give a huge gift to society and to other patients in the future because without their participation none of our work would be able to improve the lives of patients with cancer.”

Research Interests

  • melanoma
  • skin cancer
  • Gynecological cancers
  • immunotherapy
  • adoptive cell therapy

For a list of Dr. Butler’s publications, please visit  on PubMed or Google Scholar.