Dr. Lee J. Helman

Dr. Meyer will serve as the lead medical oncologist for adult sarcoma patients, and will focus on building the Adult Sarcoma and Connective Tissue Oncology Program. In collaboration with pediatric oncologist David Loeb, M.D., Ph.D., and orthopaedic surgeon Kristy Weber, M.D., Meyer will bring novel therapies to the clinic for sarcoma patients. Meyer received his bachelors and masters degrees in cell and molecular biology from Stanford University. From there, he joined the Medical Scientist Training Program at Baylor College of Medicine and earned his medical degree followed by a doctorate in immunology. Meyer completed his residency at the University of Maryland and served as chief resident in medicine from 2004-2005. Afterward, he joined our fellowship program in medical oncology and has been working in the laboratory of Jonathan Powell, M.D., Ph.D., on projects relating to the characterization of molecular regulatory pathways involved in T-cell activation and energy. As a third-year fellow, Meyer served as the chief fellow for our Training Programs in Hematology and Medical Oncology and he received a Young Investigator Award from the American Society of Clinical Oncology in 2010. Dr. Meyer is rated as a Distinguished provider by MediFind in the treatment of Osteosarcoma. His top areas of expertise are Mesenchymoma, Undifferentiated Pleomorphic Sarcoma, Bone Tumor, and Ganglioneuroblastoma.

As instructor of oncology and pediatrics, Llosa’s research focus is the immunotherapy of sarcomas. My research focuses on understanding how the immune system interacts with cancer cells from sarcoma tumors. Sarcoma is a type of cancer that can occur in various locations in the body. Sarcoma is the general term for a broad group of cancers that includes tumors that form in the bones and in the soft (also called connective) tissues. Sarcomas affect people of all ages and some, such as Rhabdomyosarcoma, Neuroblastoma, Ewings sarcoma and Osteosarcoma, are more common in children and young adults. Treatments for sarcoma vary depending on tumor type, location and other factors. I concentrate in the immunotherapy of sarcomas. Immunotherapy (also called biologic therapy or biotherapy) is a type of cancer treatment designed to boost the body's natural defenses to fight the cancer. It uses materials either made by the body or in a laboratory to improve, target, or restore immune system function. Immunotherapy works by stopping or slowing the growth of cancer cells, stopping cancer from spreading to other parts of the body, or helping the immune system increase its effectiveness at eliminating cancer cells. There are several types of immunotherapy, including monoclonal antibodies, non-specific immunotherapies, and cancer vaccines. My specific area of interest is the use of drugs that target immune system checkpoints. The immune system has checkpoints to keep itself from attacking other normal cells in the body. Cancer cells sometimes take advantage of these checkpoints to avoid being attacked by the immune system. CTLA-4 and PD-1/PD-L1 are checkpoint molecules found on immune system cells (T cells) that can be blocked with drugs leading to a general raise in the immune system of the patients which helps it attack cancer cells. These types of drugs are currently being given to patients with melanoma (skin cancer), lung cancer and kidney cancer with great success and they have been found to shrink advanced tumors in many people. The best part of the treatment is that many of these tumor responses have been long-lasting so far, and the side effects are generally less serious than when using chemotherapy. Larger clinical trials are now studying both drugs, both alone and/or in combination with other treatments. My task is and will continue to be using the same type of approach for attacking sarcomas and hopefully obtained the very promising results and long lasting responses observed with the use of immune checkpoint inhibitors in other types of cancer. Dr. Llosa is rated as an Advanced provider by MediFind in the treatment of Osteosarcoma. His top areas of expertise are Adult Soft Tissue Sarcoma, Osteosarcoma, Malignant Peripheral Nerve Sheath Tumor, Ewing Sarcoma, and Bone Marrow Transplant.

Dr. Christine Pratilas is a pediatric medical oncologist at the Sidney Kimmel Comprehensive Cancer Center and Associate Professor of Oncology, Pediatrics & Cellular and Molecular Medicine at the Johns Hopkins University School of Medicine. She joined the Hopkins pediatric sarcoma team in 2014. Dr. Pratilas received her undergraduate degree in Biology from Drew University in New Jersey and her medical degree from UMDNJ - Robert Wood Johnson Medical School (now Rutgers University), where she also completed her internship and residency from 1999 to 2002. From 2002 to 2005 she was a fellow in hematology and oncology in the Memorial Sloan Kettering Cancer Center (MSKCC) Department of Pediatrics, and in the Department of Pediatric Hematology and Oncology at New York Weill Cornell Medical Center. She was a postdoctoral research fellow in Dr. Neal Rosen’s Molecular Oncogenesis Laboratory at MSKCC. From 2006 to 2014 she was attending in Pediatric Oncology at MSKCC, specializing in developmental therapeutics & sarcoma. She has been the director of the pediatric sarcoma program at Hopkins since 2018. Dr. Pratilas focuses her research on cancer-associated pathways and signal transduction, which involves figuring out how a cell’s internal molecular pathways work, and how those pathways can be molecularly controlled. This knowledge is the basis for developing promising new molecularly targeted cancer therapies, which is the focus of Dr. Pratilas’s research. Among her important scientific contributions is advancing our understanding of how certain proteins that can be mutated in cancer, known as RAF kinases (specifically BRAF), affect a cancer cell’s behavior. The research in Dr. Pratilas' laboratory is focused on RAS signal transduction pathways, concentrating on pediatric sarcomas such as rhabdomyosarcoma and malignant peripheral nerve sheath tumors, in order to develop novel therapeutics for children with these tumors. Dr. Pratilas is rated as a Distinguished provider by MediFind in the treatment of Osteosarcoma. Her top areas of expertise are Malignant Peripheral Nerve Sheath Tumor, Neurofibromatosis Type 1 (NF1), Neurofibromatosis, Adult Soft Tissue Sarcoma, and Osteotomy.