Meet the Doctors

Dr. Maria Scouros, M.D., Founder of Houston Cancer Institute, P.A.


Dr. Maria Scouros founded the Houston Cancer Institute in 1984. She is Board Certified in Medical Oncology with an international reputation for practicing state-of-the-art medicine with a commitment to excellence.

Dr. Maria Scouros has brought new advances in cancer therapy to the Houston community she serves. Over the years, she has implemented new treatments, such as interleukin therapy, autologous bone marrow transplantation, monoclonal antibodies and anti-angiogenesis therapy in addition to making available new chemotherapy and other regimens to all of her patients. Her reputation for integrating a multi-modality approach to the care of her patients ensures them access to all the tools that are available to fight their cancer.

Being multi-lingual, Dr. Scouros helps patients from around the world understand their options and treatment plans in their own language. Family members and caregivers are included in her care and compassion. She respects and answers their questions and concerns.

No one wants cancer, but when it strikes, patients can find comfort in Dr. Scouros’ knowledge, compassion and personal care. At the Houston Cancer Institute, the journey to health is a partnership between physician and patient.

Dr. Dongxin Liu, M.D., Ph.D.

Dr. Liu received her Hematology/Oncology training at the Baylor College of Medicine in Houston, Texas and is Board Certified in Internal Medicine, Hematology and Oncology. Dr. Liu completed her Internal Medicine Internship and Residency at the New York Medical College in the Richmond University Medical Center in Staten Island, NY.

She also holds a PhD in Pathology from the University of Southern California in Los Angeles, CA. Dr. Liu is a member of the Texas Medical Association, the Harris Medical Society, the American Society of Clinical Oncology (ASCO), and the American Society of Hematology (ASH). Dr. Liu received her Medical Degree in 1992 from the Shandon Medical University, Jinan, Shandong Province, China.

Dr. George Vroulis, Ph.D.


Dr. George Vroulis joined the Houston Cancer Institute, PA, as Consultant Psychologist in 2009. His goal to is provide special programs for patients and their families who need support to deal with the stress of a cancer diagnosis. He also helps families deal with stress management and grief management. In addition he has extensive experience in providing support for patients who need to stop smoking.

Dr. George Vroulis is licensed by the Texas State Board of Examiners of Psychologists since 1979. He has been a member of the honor societies of the University of Houston, American Psychological Association, American Society of Clinical Hypnosis, World Mental Health Federation and Houston Neuropsychological Society in the EAPA, USA, and Greece.

He has an extensive background in the field of neuropsychology and has presented many workshops over the past 20 years which address a wide range of topics from cancer support, staff stress, grief management for terminal patients and their families, stress management, Alzheimer’s disease, anxiety, neuropsychological testing and adult interpersonal communications.

Anna Hirsh, PA-C

Ms. Hirsh, obtained her physician assistant training from Midwestern University, Glendale, AZ in 2003. She is certified by the National Commission on Certification of Physician Assistants. She has a Masters of Science degree in Human Nutrition from the University of Bridgeport, CT. Ms. Hirsh is a member of the American Academy of Physician Assistants and the Texas Academy of Physician Assistants.

She has prior experience in working with oncology patients in an outpatient setting. She has assisted in the evaluation, management and ongoing daily care and education of clinic patients.