^{Immunology and Oncology}

Surgery is the main treatment in nearly every case of cancer, and it is the main treatment for both pheochromocytoma and Merkel cell cancer. During surgery, the doctor removes a tumour along with a small border of healthy tissue around a tumour, called a margin. For pheochromocytoma, laparoscopic surgery may be performed. Laparoscopic surgery is a less invasive type of surgery that uses three or four small incisions instead of one large incision. A thin, lighted tube called a laparoscope that is attached to a video camera is inserted through one opening to guide the surgeon. Surgical instruments are inserted through the other openings to perform the surgery. If removing the tumour using surgery is not possible, it is called an inoperable tumour, and the doctor will recommend another type of treatment. The patient candidate for surgery does not depend on factors such as the type, size, location, grade and stage of the Tumor along with the consideration of the general health factors like age, physical fitness and other coexisting medical conditions. Surgery will be combined with other Cancer treatments, such as chemotherapy, Radiation therapy or hormone therapy in some Cases.