ConclusionsFuture research directions identified include the need for more observational studies on additional types of cancer with larger sample sizes; the need to examine whether the association between physical activity and mortality varies by tumor, clinical, or risk factor characteristics; and the need for research on the biological mechanisms involved in the association between physical activity and survival after a cancer diagnosis. Future randomized controlled trials of exercise with biomarker and cancer-specific disease endpoints, such as recurrence, new primary cancers, and cancer-specific mortality in cancer survivors, are warranted. (Source: JNCI)MedWorm Sponsor Message: Have a look at The Breast Cancer Daily, the new breast cancer portal with all the latest breast cancer news and research powered by MedWorm, updated daily. read more..