Careseng is a cancer treatment that uses the body’s own immune system to fight the disease. The treatment is based on a special type of cell, called a CTL, which is able to target and kill cancer cells while leaving healthy cells intact. CTLs are derived from the patient’s own blood, so there is no risk of rejection or side effects. Careseng has been shown to be effective in treating several types of cancer and also serves as one of the alternative cancer treatments to chemotherapy.