How Stress May Affect Cancer

March 8, 2006 — -- Does stress cause cancer?

While the opposite is certainly true -- cancer causes stress -- it's not known for sure how stress may lead to or exacerbate conditions like cancer. But it's an intriguing question among experts who are researching the potential links.

Perhaps the strongest indication that there may be a connection between stress and cancer comes from research in cell biology and biochemistry. Recent experiments have shown that certain molecules that increase in times of stress have also been linked with several diseases including cancer.

While the research is young, "inflammatory pathways activated by stress have been implicated in the development of tumors, metastasis of tumors, and resistance to chemotherapy," said Dr. Charles Raison, professor of psychiatry and behavioral sciences and director of the Behavioral Immunology Clinic at Emory University in Atlanta.

What's better-known: People who are in acute stress have been shown to have a reduction in immune function, but how that might translate into cancer in people is hard to define.

"People in high-stress occupations, such as police officers, doctors and firefighters don't have higher incidences of cancer than other members of the community," said Dr. Derek Raghavan, director of the Cleveland Clinic Taussig Cancer Center. "There is folklore that people who are grieving have a higher chance of getting cancer than others. But the data are conflicting, and carefully controlled studies do not support it."

Another viewpoint: Stress may not lead to the development of cancer, but it may affect its progression.

"Once you have cancer, then the presence of stress and stress-related states like pessimism and hopelessness are associated with the progression of cancer and decreased survival," Raison said.

Many scientists, however, disagree.

"There is virtually no connection between stress and cancer. I think it's disastrous that people are led to believe there is," said Robert Sapolsky, professor of neuroscience at Stanford University. "The right supportive setting can decrease stress and will indeed enhance the biology of how your body can deal with disease. But cancer, I think, does not fall into that category."