"Petra Ketterl, MD, is a fellowship-trained Medical Oncologist, practicing since 1993. Born in southern Germany, where an anthroposophic approach to medicine is well-known, Dr. Ketterl carried these principals with her when she moved to the U.S. and attended medical school at ETSU. After graduation, residency and fellowship, she opened a private practice for Medical Oncology, which she operated for 9 years before joining Cancer Treatment Centers of America as a Medical Oncologist for 15 years, also serving as a Physician Advisor. She currently lives in East Tennessee, where she serves as an oncology consultant for Dr. Hancock at Humanizing Medicine. She met Dr. Hancock in 2017, at a symposium for Integrated Cancer Treatment, where she learned about his Mistletoe Cancer Therapy practice."