How colorectal tumors increased 500 PERCENT in some age groups, per new analysis

Colorectal cancers have risen by up to six-fold in some young age groups since 2000, research shows.

Doctors say the cancers are likely being missed because routine screening in America is only recommended every ten years beginning at age 45.

The average age of colon cancer patients has been getting younger in recent decades in a trend linked to junk food, obesity and toxic chemicals.

Now, a new analysis has broken down the rise in the most granular detail yet using CDC data.

In 2020, only 0.6 children ages 10 to 14 per 100,000 population were diagnosed with colorectal cancer compared to 0.1 per 100,000 in 1999 - a 500 percent increase. Escalations were also found in older adults, with rates rising by 71 percent to 6.5 per 100,000 people in aged 30 to 34 and by 58 percent to 11.7 per 100,000 in ages 35 to 39 in 2020

Researchers from the University of Missouri-Kansas City found the rate of colorectal cancers grew 500 percent among children ages 10 to 14 and 333 percent among teens aged 15 to 19.

'Colorectal cancer is no longer considered just a disease of the elderly population,' said lead researcher Dr Islam Mohamed, an internal medicine resident physician at the University of Missouri-Kansas City.

The researchers looked at rates of colorectal cancer in children and adults aged 10 to 44, and found that cases had risen in all age groups.

'It means that there is a trend,' Dr Mohamed told NBC. 'We don't know what to make of it yet, it could be lifestyle factors or genetics, but there is a trend.'

While cases have shot up, the overall number of cases in people below 40 is still low, and cases in under 30s remain rare.

For example, in 2020, the American Cancer Society estimated there were just 17,930 colorectal cancer cases in Americans under the age of 50.

As for the rate of cases, in 2020, only 0.6 children ages 10 to 14 per 100,000 population were diagnosed with colorectal cancer compared to 0.1 per 100,000 in 1999. 

Diagnoses in teens age 15 to 19 went from 0.3 to 1.3 per 100,000, and in young adults ages 20 to 24, cases rose from 0.7 to two per 100,000.

Escalations were also found in older adults, with rates rising by 71 percent to 6.5 per 100,000 people in aged 30 to 34 and by 58 percent to 11.7 per 100,000 in ages 35 to 39 in 2020. 

While the 40-to-44 age group had a lower percentage increase of 37 percent, the group had the highest incidence rate, reaching 20 per 100,000 people in 2020.

Incidence rate is the number of new cases of a disease divided by the number of persons at risk for the disease.

When rates are low to start with, any increase can be significant.

'When you are starting off with a very rare disease in 15-year-olds and you add a couple cases, you are going to have a huge percentage increase,' Dr Folasade May, an associate professor of medicine in the University of California, Los Angeles Vatche and Tamar Manoukian Division of Digestive Diseases, told NBC.

Erin Verscheure was 18 when she was diagnosed with stage four colorectal cancer. It was 2016 and she had just graduated high school when she noticed blood in her stool

Ms Verscheure had a bowel resection, which is an operation to remove part of the small intestine, large intestine or both, followed by 12 rounds of chemotherapy. In August 2017, she was told she was in remission

Evan White, from Dallas and the eldest of three children, was diagnosed with stage three colon cancer at the age of 24 after going into hospital to get an abscess removed from his tonsils. He is pictured above at Christmas with his then puppy, a Bernese Mountain Dog, named Lola

Dr May added that while the overall increases are worrying, it is reassuring to see that the oldest age group had the smallest percentage increase, because 40-44 year olds had the biggest number of cases to begin with.

One such teen is Erin Verscheure, who was 18 when she was diagnosed with stage four colorectal cancer.

It was 2016 and she had just graduated high school when she noticed blood in her stool. 

'I honestly did not know that colorectal cancer was a real thing, so I never did any research about it and was diagnosed very quickly,' she said.

One day the toilet was completely full of blood which left her 'pretty concerned', so she went to the doctors to get her blood work done.

'I could not believe that this had become my life. I was supposed to be a newly graduated 18 year old, I had this whole new world ahead of me. But the hospital stays and chemo chair consumed me and took part of my life away.'

Originally, doctors told her it was just a bad case of salmonella that would go away on its own, but then decided she should see a specialist for a colonoscopy, after which she was diagnosed with the disease.

She had a bowel resection, which is an operation to remove part of the small intestine, large intestine or both, followed by 12 rounds of chemotherapy.

In August 2017, she was told she was in remission. 

Meanwhile, Evan White, 24, from Dallas, had just graduated from the University of Arkansas with a degree in finance when he was diagnosed with colon cancer after dismissing his main symptom - tiredness - for months.

The tumor was not spotted until it had progressed to stage three, meaning it had spread outside the colon, making it much harder to treat. 

Mr White had been on track to marry his girlfriend and move to California, but his dreams were cut short when he died after a four-year battle with the disease.

Experts are not sure what's behind the unprecedented rise, and are exploring whether modern diets, antibiotics or even fungal infections could be at play.

Colorectal cancer normally begins as a small growth, called a polyp, on the inner lining of the colon or rectum — part of the large intestine. 

Over time, the cells in these polyps can start to divide uncontrollably, triggering the cancer.

It often doesn't cause any or very few symptoms in the early stages, which is why doctors say everyone aged 45 and over should get screened for the cancer once a decade. It is also possible to get screened at an early age after talking to doctors.

Early warning signs of the disease can include a change in bowel habits, blood in feces, unexplained weight loss and sudden fatigue or weakness — brought on by blood loss.

If caught in the early stages, before it spreads to other areas, the charity Fight Colorectal Cancer says nine in ten patients will live beyond five years after their diagnosis.

But should the cancer not be detected until stage three, the five-year survival rate drops to 71 percent. At stage four, just 14 percent of patients live for another five years.