Tyrosine kinase inhibitors (TKIs) are a class of medications that block the action of enzymes called tyrosine kinases. These enzymes play a crucial role in the signaling pathways that regulate cell growth and division. By inhibiting these enzymes, TKIs can help prevent the uncontrolled growth of cancer cells, making them an important treatment option for various types of cancer. TKIs are often used in targeted cancer therapies, specifically for conditions like chronic myeloid leukemia and certain solid tumors. They can be taken orally and are designed to specifically target cancer cells while minimizing damage to normal cells, leading to potentially fewer side effects compared to traditional chemotherapy.