New study looks at which types of cancer are increasing for people below 50
Cancer before age 50 is rare, but increasing, in the United States, and researchers want to know why.
Related video above: This specific type of cancer could double by 2040
A new government study provides the most complete picture yet of early-onset cancers, finding that the largest increases are in breast, colorectal, kidney and uterine cancers. Scientists from the National Cancer Institute looked at data that included more than 2 million cancers diagnosed in people 15 to 49 years old between 2010 and 2019.
Of 33 cancer types, 14 cancers had increasing rates in at least one younger age group. About 63% of the early-onset cancers were among women.
바카라 게임 웹사이트These kinds of patterns generally reflect something profound going on,바카라 게임 웹사이트 said Tim Rebbeck of Dana-Farber Cancer Institute, who studies cancer risk and was not involved in the research. 바카라 게임 웹사이트We need to fund research that will help us understand."
The findings were published Thursday in Cancer Discovery, a journal of the American Association for Cancer Research.
How many extra cancers are we talking about?
The researchers compared cancer rates in 2019 to what would be expected based on 2010 rates.
Breast cancer made up the largest share of the excess cancers, with about 4,800 additional cases. There were 2,000 more colorectal cancers compared with what would be expected based on the 2010 rates. There were 1,800 more kidney cancers and 1,200 additional uterine cancers.
Reassuringly, death rates were not rising for most cancers in the young adult age groups, although increasing death rates were seen for colorectal, uterine and testicular cancers.
Why is this happening?
Explanations will take more research. The big databases used for the study do not include information on risk factors or access to care. Theories abound, and a big meeting is planned later this year to bring together experts in the area.
바카라 게임 웹사이트Several of these cancer types are known to be associated with excess body weight, and so one of the leading hypotheses is increasing rates of obesity,바카라 게임 웹사이트 said lead author Meredith Shiels of the National Cancer Institute.
Advances in cancer detection and changes in screening guidelines could be behind some early diagnoses.
For breast cancer, the trend toward women having a first child at older ages is a possible explanation. Pregnancy and breastfeeding are known to reduce risk.
It's not a uniform trend for all cancers
This is not happening across the board. Cancer rates in people under 50 are going down for more than a dozen types of cancer, with the largest declines in lung and prostate cancers.
Cigarette smoking has been declining for decades, which likely accounts for the drop in lung cancer among younger adults.
The drop in prostate cancer is likely tied to updated guidelines discouraging routine prostate-specific antigen testing in younger men because of concerns about overtreatment.
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