Center for Neurosciences

Center Information

Marjorie Pazzi, RN, BSN, CCRP
Site Director
Center for Neurosciences
2450 E. River Road
Tucson, AZ 85718

Currently Enrolling Trials

[Show More]

Therapeutic Areas



THE CENTER FOR NEUROSCIENCES is home to Southern Arizona’s largest and longest standing group practice dedicated to the treatment of neurological disorders. Our aim is to provide the highest-quality neurological care– the same level of care we would want for ourselves or our loved ones.


The Center for Neurosciences (CNS) Clinical Research Program is dedicated to delivering excellence in Neuroscience research. Board-Certified Neurologists and Child Neurologists are expert in their respective specialties and have extensive clinical and research experience in a broad range of neurologic diseases affecting adults and children. Therapeutic areas include epilepsy (both Adult and Pediatric), Parkinson’s disease, Alzheimer’s disease, malignant brain tumors, multiple sclerosis, and autism spectrum disorders. Our Program is primarily involved with sponsored Phase 2-4 clinical trials, but several of our investigators have developed and conducted Investigator Initiated Studies. Our clinic is always growing and currently has a database of over 67,000 active patients. .


In 2008, CNS opened a new outpatient facility which brings the most advanced level of neurological care available to patients; one year later a dedicated research program was foundedOur facility has on-site radiology including MRI and CT scanners,  multiple exam rooms and infusion room, an FDA-compliant laboratory with a centrifuge, a -20°C freezer, secure & temperature-controlled study drug storage, an ECG machine, and a monitoring/CRA room with high-speed internet access.


All CNS Principal and Sub-Investigators are certified in Good Clinical Practice and Human Subjects Protection.

Adult Neurology and Neurosurgery

  • Michael Badruddoja, MD is a Board-certified Neurologist with Fellowship training in Neuro-Oncology; his special interest is in the treatment of malignant gliomas and Alzheimer’s disease. He is a Principal Investigator on Phase 2/3Alzheimer’s disease and Phase 1/2 glioblastoma trials.
  • Kathryn Bradley, MD is Board-certified in Neurology by the American Board of Psychiatry and Neurology. She is also fellowship trained in movement disorders. Dr. Bradley is a Principal Investigator for Parkinson’s disease .
  • Abhay Sanan, MD is Board-certified by the American Board of Neurological Surgery and completed his fellowship in Skull Base/Cerebrovascular Surgery. He is the Chief of Neurosurgery at Northwest Medical Center and St. Mary’s Hospital. Dr. Sanan is also a Principal Investigator on y studiesfor glioblastoma and a surgical device study.
  • Francisco Valdivia, MD is a Board-certified Neurologist and a member of the Consortium of Multiple Sclerosis Centers and a Multiple Sclerosis Certified Specialist. He is a Principal Investigator on several Multiple Sclerosis trials. He is also the Medical Director of Stroke at St. Mary’s Hospital. Dr. Valdivia speaks fluent Spanish.

Pediatric Neurology

  • Dinesh Talwar, MD is a Board-certified Child Neurologist and Clinical Neurophysiologist. He has Fellowship training in EEG and Neurophysiology. Dr. Talwar’s special interests include childhood epilepsy and migraines and he is Principal Investigator on multiple pediatric epilepsy and migraine trials.


Site Director and Senior Research Nurse - Marjorie Pazzi, RN, BSN, has coordinated clinical trials since 2003 and has more than 20 years experience in neurology nursing. Ms. Pazzi is the primary point of contact for Sponsors and Contract Research Organizations. She is a Certified Clinical Research Professional. She speaks proficient Spanish.

Research Coordinators – Ashley Nix (Burleigh)  earned her Associate of Applied Science in Clinical Research at Pima Community College. She has several years of experience in the medical field and coordinates multiple studies as the lead study coordinator.
Clarissa Zigelstein earned her Bachelor of Arts degree in business. She has worked for many years in the medical field with several years’ experience working as a phlebotomist and in hospital labs. She coordinates multiple studies.  Clinical Research Assistant— Annette Cole is a certified Pharmacy Technician and provides pharmacy services for the clinical trials. She assists in multiple areas in the clinical research program providing support with data entry, recruitment activities, and administrative assistance.

The Center for Neurosciences Clinical Research Program partners with highly skilled professionals in Neuro-Radiology, Nuclear Medicine, Dermatology, Cardiology and Ophthalmology when consultations or services are required for research protocols. Our contracted Board-Certified Psychologists perform a variety of psychometric assessments in adults and children.


CNS not only serves the metropolitan Tucson area, but also due to several outreach clinics in small communities throughout the state, reaches about 1.5 million people in Southern Arizona. This region has a culturally and ethnically diverse patient population, with 60% Caucasian, 33% Hispanic, 2% African American, 3% Native American, and 2% Asian. Several of our Investigators are fluent Spanish speakers.


CNS has collaborated with numerous Pharmaceutical Companies and Contract Research Organizations on all phases of research. We offer expeditious study start-up with prompt contract execution and regulatory approval. We utilize centralized Institutional Review Boards such as Copernicus, Quorum, Schulman, Western and New England IRB. With access to an extensive patient base from which to draw as well as a comprehensive research database, we are frequently an early-enrolling site and typically meet or exceed enrollment goals.

Contact Center

If you are interested in contacting this center to discuss clinical trials, please complete and send the email form below. A representative from the research center will then follow up with you.