What Causes Nasopharyngeal Cancer?

The exact cause of most cases of nasopharyngeal cancer (NPC) is not known. But scientists have found that it's linked with certain diets, infections, and inherited characteristics. (See Risk Factors for Nasopharyngeal Cancer.)

In recent years, scientists have studied how the Epstein-Barr virus (EBV) may cause cells in the nasopharynx to become cancer, but there's still a lot to learn. In developed countries, most people infected with EBV have infectious mononucleosis (mono), and their immune system is able to recognize and destroy the virus. These people recover without any long-term problems. But in some cases, pieces of EBV DNA mix with the DNA of cells in the nasopharynx.

DNA is the chemical in each of our cells that makes up our genes, the instructions for how our cells work. For instance, we often look like our parents because they're the source of our DNA. But DNA affects more than how we look. Some genes contain instructions that control when cells grow and divide into new cells. Viruses like EBV also contain DNA. When a cell is infected with the virus, the viral DNA may mix with the normal human DNA. Then the EBV DNA may instruct the cells of the nasopharynx to divide and grow in an abnormal way. Still, EBV infection rarely leads to NPC, so other factors probably play a role in whether or not it causes cancer.

For instance, eating a diet high in salt-cured fish and meat seems to increase the ability of EBV to cause NPC. Studies show that foods preserved in this way may produce chemicals that can damage DNA. The damaged DNA then alters a cell’s ability to control its growth and replication.

Some studies suggest that inheriting certain tissue types may contribute to a person’s risk of developing NPC. Because the tissue type plays a role in the function of the immune system, some scientists suspect that an abnormal immune reaction to EBV infection may be involved. The details of how certain tissue types might increase NPC risk are still being worked out.

The American Cancer Society medical and editorial content team

Our team is made up of doctors and oncology certified nurses with deep knowledge of cancer care as well as journalists, editors, and translators with extensive experience in medical writing.

Sinha S, Bhimji SS. Cancer, Nasopharynx. [Updated 2017 Oct 5]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2018 Jan-. Accessed at www-ncbi-nlm-nih-gov.proxy.library.emory.edu/books/NBK459256/ on April 20, 2018.

Last Revised: September 24, 2018

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