Final answer:
A physician specializing in the diagnosis and treatment of cancer is called an oncologist. Oncologists are medical doctors who have specialized training in the field of oncology, which is the study and treatment of cancer.
Step-by-step explanation:
A physician specializing in the diagnosis and treatment of cancer is called an oncologist. Oncologists are medical doctors who have specialized training in the field of oncology, which is the study and treatment of cancer. They work closely with patients to provide personalized care and develop treatment plans based on the specific type and stage of cancer.