Global cancer cases are projected to rise 75 percent by 2030, in part because many other diseases are being stamped out and more developing countries are adopting Western lifestyles linked to cancer, international health experts report.

While population growth and aging explain much of the increase, at least one-fifth of the new cancer cases will likely be due to preventable factors, the researchers predict.

Cancers that are caused by infections are falling. But experts say that decline will be outpaced by a surge in cancers linked to bad diet and exercise habits, smoking and drinking too much alcohol.