Dr. Gregory A. Masters

Dr. Matthias Holdhoff is a medical oncologist and co-director of the Brain Cancer Disease Group at the Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins. He is a professor of oncology, neurology and neurological surgery at Johns Hopkins University School of Medicine. Dr. Holdhoff’s expertise is in primary brain cancers and central nervous system lymphomas. He earned his medical degree from Freie Universität Berlin, received his doctorate degree at Charité University Medicine Berlin. Dr. Holdhoff completed residency training in internal medicine at Johns Hopkins Bayview Medical Center, followed by a fellowship in medical oncology at Johns Hopkins Hospital with research training at the Ludwig Center for Cancer Genetics and Therapeutics (Kinzler-Vogelstein lab). As a clinical investigator in neuro-oncology, his research is focused on novel trials and translational biomarker studies in malignant gliomas and primary central nervous system lymphomas. He has led and contributed to numerous clinical trials, publications and presentations. Dr. Holdhoff serves as the director of the solid tumor inpatient service at the Sidney Kimmel Comprehensive Cancer Center. He is passionately involved in mentoring and teaching of fellows, residents and students. He is the director of the UCNS-certified neuro-oncology fellowship program at Johns Hopkins, and he is a teaching attending physician for the Osler internal medicine residency program. Dr. Holdhoff is rated as an Elite provider by MediFind in the treatment of Embryonal Tumor with Multilayered Rosettes. His top areas of expertise are Glioma, Glioblastoma, Astrocytoma, and Brain Tumor.

Kristopher Bosse is a Pediatrics specialist and a Hematologist in Philadelphia, Pennsylvania. Dr. Bosse is rated as a Distinguished provider by MediFind in the treatment of Embryonal Tumor with Multilayered Rosettes. His top areas of expertise are Neuroblastoma, Embryonal Tumor with Multilayered Rosettes, Gliomatosis Cerebri, and Adrenal Cancer.

Eric Raabe, M.D., Ph.D., is an associate professor of oncology and pathology at Johns Hopkins School of Medicine. Dr. Raabe majored in neural science at Brown University and received his M.D. and Ph.D. from the University of Cincinnati College of Medicine. He completed his pediatric internship and residency at Children’s Hospital of Philadelphia. After spending a year working in Africa as part of the Baylor International Pediatric AIDS Initiative, Dr. Raabe joined Johns Hopkins as a pediatric oncology fellow. Working in the laboratory of Charles Eberhart in Neuropathology, Dr. Raabe established a neural stem cell system to create genetically accurate models of pediatric brain tumors. In collaboration with patients and families, he has also developed multiple pediatric brain tumor cell lines that are some of the key models used for pre-clinical testing. Dr. Raabe sees patients in the pediatric oncology outpatient clinic at Johns Hopkins, with a focus on pediatric brain tumors. Dr. Raabe is also the point person in oncology for retinoblastoma care. He continues his research in the new Smith Building of the Wilmer Eye Institute in the Neuropathology Division, in collaboration with Charles Eberhart. Dr. Raabe is rated as an Elite provider by MediFind in the treatment of Embryonal Tumor with Multilayered Rosettes. His top areas of expertise are Rhabdoid Tumor, Diffuse Midline Glioma H3 K27M-Mutant, Glioma, and Pediatric Low-Grade Glioma (pLGG).