Cancer is among the leading causes of morbidity and mortality worldwide, with 14.1 million new cancer cases and 8.2 million cancer-related deaths in 2012.1(p3) By 2030 the global cancer burden is expected to double, with 21.7 million new cases and 13.2 million cancer deaths projected due to demographic changes alone.1(p3) These estimates will likely be compounded by the trend toward unhealthy lifestyle behaviors (eg, smoking and poor diet), particularly in emerging economies. Given that large increases in cancer incidence and mortality are expected to occur in developing countries where economic resources for secondary and tertiary care are low, primary preventive strategies for cancer risk reduction could help to decrease the worldwide cancer burden.
McCullough LE, McClain KM, Gammon MD. The Promise of Leisure-Time Physical Activity to Reduce Risk of Cancer Development. JAMA Intern Med. 2016;176(6):826-827. doi:10.1001/jamainternmed.2016.1521