Doctors 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. Find doctors and medical staff: Edit search filters close Narrow your search Doctor's Name, Condition Or Procedure By location Phoenix/Scottsdale, AZ 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 There are no doctors whose last name begins with the letter D D There are no doctors whose last name begins with the letter E E Find a doctor whose last name begins with the letter F F There are no doctors whose last name begins with the letter G G There are no doctors 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 Find a doctor 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 Find a doctor whose last name begins with the letter P P There are no doctors whose last name begins with the letter Q Q active Find a doctor whose last name begins with the letter R R Find a doctor whose last name begins with the letter S S There are no doctors 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 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 Find a doctor whose last name begins with the letter Z Z By conditions treated No results found By procedures performed No results found By spoken language No results found Reset all filters Search Tips Use quotes for phrases. Even if there are no auto-suggestions within the search field, hit "Search" anyway, as you may still get results. Displaying 1-1 out of 1 doctors available Last Name Initial: R William G. Rule, M.D. Radiation Oncologist Phoenix, AZ Areas of focus: Radiation therapy, Proton therapy, Stereotactic body radiotherapy, Intraoperative radiation therapy, Intensity-modulate...d radiation therapy, Colon cancer, Liver cancer, Pancreatic cancer, Neuroendocrine tumor, Multiple myeloma, Rectal cancer, Stomach cancer, Cholangiocarcinoma, Esophageal cancer, Leukemia, Lymphoma, Primary mediastinal large B-cell lymphoma, Anal cancer, Pancreatic neuroendocrine tumor, Small bowel cancer Show more areas of focus for William G. Rule, M.D. Request an appointment Conditions treatedSpecialty groups July 21, 2026 Share on: FacebookTwitter High-Risk Pancreatic Cancer Program in ArizonaSectionsOverviewTests & proceduresConditions treatedDoctorsSpecialty groupsExpertise & rankingsResearchCosts & insuranceReferrals SectionsRequest an AppointmentOverviewTests & proceduresConditions treatedDoctorsSpecialty groupsExpertise & rankingsResearchCosts & insuranceReferrals ORG-20603692 Medical Departments & Centers High-Risk Pancreatic Cancer Program in Arizona