En español | People's underlying health — not their age — has a bigger effect on how well they'll do after a diagnosis of advanced skin cancer, a new study finds.
People who are frail and in poor health, even if they are young, do worse than older people in good health, say researchers with the University of Michigan Comprehensive Cancer Center. Health experts say the study could lead to better ways to treat other illnesses as well.
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The new results differ from previous research that had linked older age to poorer outcomes in melanoma.
"We underestimate the role played by the patient's health, yet our results show that the body's ability to fight the disease is more important than age," says surgeon Michael Sabel, M.D., lead author of the paper.
"This interesting and provocative paper has the potential to lead to a new understanding of how to treat patients not only for melanoma, but for other cancers as well," says Marianne Berwick, head of epidemiology and cancer prevention at the University of New Mexico School of Medicine, who was not involved with the study.
The study, published online in the Annals of Surgical Oncology, looked at 101 men and women who were treated for stage III melanoma, the point at which cancer cells have spread either to nearby tissue or to at least one lymph node. The group ranged in age from 18 to 87, with an average age of 53.
Sabel and his colleagues examined CT scans for each patient to measure muscle density. The men and women with lower muscle density, a condition called sarcopenia, were significantly more likely to have the cancer return and spread to distant parts of the body, regardless of age or initial tumor size. In addition, these patients experienced more surgical complications when their cancerous lymph nodes were removed.
Sarcopenia, the loss of muscle mass and strength, is a major contributor to physical frailty, a term used to define a significant loss of strength, agility and energy. Frailty can often be reversed with exercise and better nutrition.
The study's results might also explain the limited success of new cancer treatments like immune therapy and vaccines, which might not be as effective in frail patients.
"If we could reverse frailty and get people back in shape by improving their diet and getting them to exercise, theoretically it might be as effective as some of these other therapies in terms of preventing the disease from returning," says Sabel.
"We can't predict who's going to get melanoma," he added. "But we've shown that if your underlying health is poor, then the impact of the disease will be much more devastating. If your underlying health is good, even if you develop melanoma, your body will be better able to control it. That's a strong argument in favor of … regular exercise and good nutrition."
Also of interest: Why do people get more skin cancer on their left side? >>
Nissa Simon, a health writer, lives in New Haven, Conn.