Exercise-oncology research: past, present, and future.

Significant progress has been made in the field of exercise-oncology research over the past two decades. As the field continues to forge ahead, it is time to reflect on past accomplishments in order to inform and define the critical unanswered questions postulated to have the largest impact on the field and on clinical care. Against this background, we overview the extant literature base together with ongoing/planned studies examining the role of exercise therapy following a cancer diagnosis with a view towards identifying major gaps in the knowledge.