What do tumor markers mean?

Tumor markers are substances measured via blood tests, such as carcinoembryonic antigen (CEA), carbohydrate antigen 19-9 (CA 19-9), carbohydrate antigen 125 (CA 125), carbohydrate antigen 15-3 (CA 15-3), and alpha-fetoprotein (AFP). In patients with malignant tumors, these tumor markers typically rise; however, different types of cancer are associated with distinct patterns of marker elevation. So, what exactly do “tumor markers” mean? Below, we address this question.

What Are Tumor Markers?

Tumor markers refer to substances produced exclusively during the uncontrolled proliferation and metabolic activity of tumor cells—not by normal human cells. Common examples include CEA, AFP, CA 125, and CA 19-9. When elevated levels of these markers are detected during routine health examinations, further clinical evaluation is essential—including assessment of symptoms and physical signs, advanced imaging studies, and possibly fine-needle aspiration or biopsy—to confirm or exclude malignancy. If malignancy is suspected, additional staging investigations are performed to formulate an appropriate treatment plan—such as surgical resection, chemotherapy, or other multimodal therapeutic approaches.

Causes of Tumor Development

1. Ionizing radiation and ultraviolet (UV) light: Organs highly sensitive to radiation—including bone, hematopoietic tissues, and lungs—are at increased risk. Additionally, endocrine disorders may predispose individuals to cancers in hormone-sensitive organs such as the breast, ovaries, endometrium, and prostate.

2. Chemical carcinogens: For example, benzo[a]pyrene—a potent carcinogen—can induce skin cancer and lung cancer. Nutritional factors also play a significant role in carcinogenesis; it is estimated that approximately one-third of all cancers nationwide are attributable to dietary and nutritional influences.

3. Chronic diseases: Numerous studies indicate that chronic scars serve as precancerous lesions, notably for skin cancer and lung cancer. Similarly, long-standing, non-healing chronic ulcers may undergo malignant transformation and thus are classified as premalignant conditions. Other contributing factors include trace element imbalances, immunosuppression, and genetic predisposition—all of which may promote tumor development.

We hope the above information is helpful to you.