The number of Americans who have survived cancer is on the rise and is expected to reach 18 million people in the next decade, according to a report released Wednesday.
That would be a 30 percent increase over the latest figures in January 2012, which showed 13.7 million people in the United States had survived some form of cancer, according to the American Association for Cancer Research.
The forecasted increase is mainly due to the aging population, with two thirds of cancer survivors expected to be 65 or older by 2020, said the study.
The trend represents a new challenge for the health care industry and for longer-living survivors, who may face other health woes over time.
"How to ensure that these patients lead not only long lives, but healthy and productive lives, will be a vital challenge to all of us," said Julia Rowland, director of the Office of Cancer Survivorship at the National Cancer Institute, part of the National Institutes of Health (NIH).
The AACR's report shows that women with breast cancer account for 22 percent of survivors, while men with prostate cancer make up 20 percent.
However, those with lung cancer make up a slim 3 percent of all U.S. survivors.
"For patients with prostate cancer, we have a nearly 100 percent five-year survival rate, and breast cancer has made tremendous strides as well, with five-year survival rising from 75 percent in 1975 to almost 89 percent in 2012," said Rowland.
"However, we clearly need to have better diagnostic tools and better treatments for lung cancer."
A report by the US Centers for Disease Control and Prevention released in January showed that fewer people were dying from cancer in the United States, continuing a trend that began in the early 1990s.
The CDC study found that from 2000 to 2009, cancer death rates decreased by 1.8 percent per year among men and by 1.4 percent per year among women.
Cancer kills more than 1,500 people a day in the United States -- a total of 301,820 men and 275,370 women in 2012, according to the latest estimates by the American Cancer Society.
About 1.6 million Americans are diagnosed with cancer every year.