Why are more young people being diagnosed with colorectal cancer?
Cancers of the colon and rectum have been declining in older adults in recent decades. Colorectal cancers have always been considered rare in young people. Yet, scientists are reporting a sharp rise in adults as young as their 20s and 30s.
The vast majority of colorectal cancers are still found in older people. Nearly 90 percent of all cases diagnosed in people over 50. However, a new study from the American Cancer Society analyzed cancer incidence by birth year shows otherwise. The study found that colorectal cancer rates, which have dropped steadily for people born between 1890 and 1950, have been increasing for every generation born since 1950. Experts aren’t sure why.
Colorectal cancer rates are rising for Baby Boomers, Gen X’ers and Millenials.
Rectal cancers are particularly on the rise, far faster than cancers in other parts of the large intestine or colon. According to the American Caner Society, about 13,500 new cases of colon and rectal cancers will be diagnosed in Americans under 50 this year. Additionally, for all age groups more than 95,500 cases of colon cancer will be diagnosed. Nearly 40,000 cases of rectal cancer will be diagnosed.
“People born in 1990, like my son, have double the risk of colon cancer and quadruple the risk of rectal cancer” compared to the risk someone born in 1950 faced at a comparable age, said Rebecca Siegel, an epidemiologist with the American Cancer Society and the lead author of the new report, published in the Journal of the National Cancer Institute on Tuesday. And though the absolute risk is still small in younger people, she said, “They carry the risk forward with them as they age.”
It is the upward trend that is worrisome. The risk of colon and rectal cancer for individuals who were born in 1990 was five per million people in that birth group. This is up from three per million at the same stage of life for those born in 1950. The risk of rectal cancer for those born in 1990 was four per million. This is up from 0.9 per million for those born in 1950.
Read the rest of this article at the New York Times.