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Early-Onset Cancer Rates Rising in U.S., But Deaths Mostly Stable, Study Finds

A new U.S. government study has revealed that while cancer diagnoses among people under 50 are on the rise, the overall death rates for most types of cancer in this age group remain stable.
Published Thursday in the journal Cancer Discovery, the study is one of the most comprehensive assessments to date of early-onset cancers, analyzing data from more than two million cases diagnosed in Americans aged 15 to 49 between 2010 and 2019.
The findings show that 14 out of 33 cancer types had increasing incidence rates in at least one younger age group. The most significant increases were seen in breast, colorectal, kidney, and uterine cancers. Women accounted for about 63 percent of the early-onset cases.
“This pattern generally reflects something profound going on,” said Tim Rebbeck of the Dana-Farber Cancer Institute, who was not involved in the study. “We need to fund research that will help us understand why this is happening.”
The study found that, compared to 2010 data, there were 4,800 more breast cancer cases, 2,000 additional colorectal cancers, 1,800 more kidney cancers, and 1,200 extra uterine cancers by 2019.
Despite the rising numbers, researchers emphasized a key reassurance: death rates for most of these cancers are not increasing. However, exceptions were noted—colorectal, uterine, and testicular cancers saw slight rises in mortality among younger adults.
The causes behind the rise in early-onset cancers are not fully understood. The study’s datasets do not include information on potential risk factors such as obesity, lifestyle, or access to healthcare. However, researchers, including lead author Dr. Meredith Shiels of the National Cancer Institute, highlighted obesity as a possible driver.
“Several of these cancer types are known to be associated with excess body weight,” said Dr. Shiels. She also pointed to advances in detection and changing screening practices as possible contributors to earlier diagnoses.
Breast cancer trends may also be influenced by shifting reproductive patterns, such as women having children later in life, which has been associated with increased cancer risk due to fewer years of pregnancy and breastfeeding—factors known to lower risk.
Not all cancer types followed the upward trend. Rates of more than a dozen cancers, including lung and prostate cancer, are decreasing among younger people. Researchers attribute the lung cancer decline to reduced smoking rates, while updated PSA screening guidelines are likely behind the drop in prostate cancer diagnoses.
Experts plan to convene later this year to further investigate the growing early-onset cancer burden and explore targeted prevention strategies.
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