Women who reported the highest levels of physical activity in the year before they were diagnosed with breast cancer may have higher survival, according to a new study.
Published in the October 15, 2006 issue of CANCER, a peer-reviewed journal of the American Cancer Society, the study found that obese and overweight women who had higher levels of moderate or vigorous recreational physical activity within one year before diagnosis tended to have better five-year survival patterns compared to other groups. Women of ideal body weight did not experience survival benefits from exercise; more remote histories of physical activity also had no impact on survival.
Identifying factors in cancer patients that predict outcome (i.e., prognosis) is important for physicians planning patient management and patients understanding their disease. In breast cancer, clinical indicators, such as tumor size, regional lymph node involvement, and estrogen-receptor status, have been shown to influence outcome. Other lifestyle factors, such as weight, may also predict disease course. While these factors are statistically associated with outcome to some degree, they may not explain all the variation which has lead researchers to search for additional prognostic factors, such as physical activity.