Biomarkers are biological molecules found in blood, other body fluids, or tissues that can indicate the presence of cancer. They can also provide information about the likely response to certain treatments. The use of biomarkers in cancer treatment allows for a more personalized approach, ensuring that patients receive therapies that are most likely to be effective for their specific type of cancer. Examples include the use of PD-L1 expression levels to determine the suitability of immunotherapy and the presence of EGFR mutations to guide the use of EGFR inhibitors.
