Even in this time of uncertainty, Mayo Clinic is a place for hope and healing — and we're committed to delivering the care you need. With options for face-to-face, virtual visits or phone appointments in adherence with federal and state executive orders and guidance. Mustaqeem A. Siddiqui, M.D., is an oncologist in the department of hematology at Mayo Clinic's campus in Rochester, Minnesota. His specialties include CAR-T cell therapy and hematology. Mayo Clinic provides expert care to everyone who needs healing. That means combining our comprehensive, integrated care with a seamless patient experience to provide exactly the care you need. U.S. News & World Report consistently ranks Mayo Clinic among the top hospitals for cancer in the nation.