Print Departments and specialties Mayo Clinic has one of the largest and most experienced practices in the United States, with campuses in Arizona, Florida and Minnesota. Staff skilled in dozens of specialties work together to ensure quality care and successful recovery. Departments that treat this condition Cancer Care at Mayo Clinic Gynecologic oncology Hepatobiliary and Pancreas Surgery in Jacksonville Hepatobiliary and Pancreas Surgery in Rochester Laboratory Medicine and Pathology Oncology (Medical) Orthopedic Oncology Orthopedic Surgery Pediatric Hematology/Oncology Radiation Oncology Radiology Surgery Surgical Oncology and Endocrine Surgery in Arizona Trauma, Critical Care and General Surgery in Rochester Areas that research this condition Orthopedic Research Radiology Research Doctors who treat this condition Edit search filters close Narrow your search By location Phoenix/Scottsdale, AZ Rochester, MN By last name Find a doctor whose last name begins with the letter A A Find a doctor whose last name begins with the letter B B There are no doctors whose last name begins with the letter C C Find a doctor whose last name begins with the letter D D There are no doctors whose last name begins with the letter E E There are no doctors whose last name begins with the letter F F Find a doctor whose last name begins with the letter G G Find a doctor whose last name begins with the letter H H There are no doctors whose last name begins with the letter I I There are no doctors whose last name begins with the letter J J Find a doctor whose last name begins with the letter K K Find a doctor whose last name begins with the letter L L There are no doctors whose last name begins with the letter M M There are no doctors whose last name begins with the letter N N There are no doctors whose last name begins with the letter O O There are no doctors whose last name begins with the letter P P There are no doctors whose last name begins with the letter Q Q There are no doctors whose last name begins with the letter R R Find a doctor whose last name begins with the letter S S Find a doctor whose last name begins with the letter T T There are no doctors whose last name begins with the letter U U There are no doctors whose last name begins with the letter V V active Find a doctor whose last name begins with the letter W W There are no doctors whose last name begins with the letter X X There are no doctors whose last name begins with the letter Y Y There are no doctors whose last name begins with the letter Z Z Reset all filters Search Tips Use quotes for phrases. 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Displaying 1-2 out of 2 doctors available Last Name Initial: W Nabil Wasif, M.D. General Surgeon Phoenix, AZ Areas of focus: Laparoscopic surgery, Pancreatic cancer, Neuroendocrine tumor, Stomach cancer, Melanoma, Pancreatic cyst, Sarcoma, Panc...reatic neuroendocrine tumor, Gastrointestinal stromal tumor, Appendix cancer, Retroperitoneal sarcoma, Intraductal papillary mucinous neoplasm, Colon adenocarcinoma, Metastatic pancreatic cancer Show more areas of focus for Nabil Wasif, M.D. Meng Welliver, M.D., Ph.D. Radiation Oncologist Rochester, MN Areas of focus: Brachytherapy, Stereotactic body radiotherapy, Stereotactic radiosurgery, Image-guided radiation therapy, Chordoma, Lun...g cancer, Mesothelioma, Soft tissue sarcoma, Lymphoma, Bone cancer, Chondrosarcoma, Angiosarcoma, Retroperitoneal sarcoma, Thymic tumor Show more areas of focus for Meng Welliver, M.D., Ph.D. ResearchMayo Clinic is advancing research in retroperitoneal sarcoma through multidisciplinary efforts that combine surgical oncology, translational science and precision medicine. Faculty members are investigating the molecular characteristics of retroperitoneal sarcomas using next-generation sequencing technologies to better understand why these tumors recur after surgical removal and to identify potential new therapeutic targets. This research aims to develop more personalized treatment approaches by integrating genomic information from both the tumor and its microenvironment. In addition, Mayo Clinic also conducts clinical and translational research focused on sarcoma surgery and treatment sequencing, evaluating strategies that improve outcomes and reduce complications for patients undergoing complex sarcoma resections. Together, these efforts reflect Mayo Clinic's commitment to improving the diagnosis, surgical management and long-term outcomes of patients with retroperitoneal sarcoma through innovative research and multidisciplinary care. Cancer research is conducted in coordination with Mayo Clinic Comprehensive Cancer Center. Mayo Clinic Comprehensive Cancer Center receives funding from the National Cancer Institute and is designated as a comprehensive cancer center. This designation recognizes the institution's scientific excellence and multidisciplinary resources focused on cancer prevention, diagnosis and treatment. PublicationsSee a list of publications about retroperitoneal sarcoma by Mayo Clinic doctors on PubMed, a service of the National Library of Medicine. Research Profiles Edit search filters close Narrow your search By location Arizona Florida Minnesota View all View all physicians • All Locations Ahmed, Safia K. M.D. Arizona Bagaria, Sanjay P. M.D. Florida Grotz, Travis E. M.D., M.S. Minnesota Houdek, Matthew T. M.D. Minnesota Okuno, Scott H. M.D. Minnesota Siontis, Brittany L. M.D. Minnesota By Mayo Clinic Staff Request an appointment Stages Sept. 19, 2026 Print Related Associated Procedures Cancer treatment Chemotherapy CT scan MRI Needle biopsy Palliative care Positron emission tomography (PET) scan Radiation therapy Show more associated procedures Retroperitoneal sarcomaSymptoms&causesDiagnosis&treatmentStagesDoctors&departments Research: It's all about patients Show transcript for video Research: It's all about patients [MUSIC PLAYING] Joseph Sirven, M.D., Professor of Neurology, Mayo Clinic: Mayo's mission is about the patient. The patient comes first. So the mission and research here is to advance how we can best help the patient, how to make sure the patient comes first in care. So in many ways, it's a cycle. It can start with as simple as an idea worked on in a laboratory, brought to the patient bedside, and if everything goes right — and let's say it's helpful or beneficial — then brought on as a standard approach. And I think that is one of the unique characteristics of Mayo's approach to research — that patient-centeredness — that really helps to put it in its own spotlight. CON-20606851 Diseases & Conditions Retroperitoneal sarcoma