What is the difference between CA 15-3 and CEA?

CA 15-3 and CEA are both tumor markers, but they are associated with different types of cancer. CA 15-3 is primarily associated with breast cancer, whereas CEA (carcinoembryonic antigen) is a tumor marker used in various cancers, including colorectal, lung, and pancreatic cancers. Each marker is measured through blood tests and can aid in cancer diagnosis, monitoring treatment response, and detecting cancer recurrence. However, it's important to note that elevated levels of these markers are not specific to cancer and can also occur in non-cancerous conditions. Therefore, further evaluation and consultation with healthcare professionals are essential for accurate interpretation and diagnosis.