Colorectal cancer is rising among younger adults and scientists are racing to uncover why | CNN



CNN
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Nikki Lawson received the shock of her life at age 35.

A couple of years ago, she noticed that her stomach often felt irritable, and she would get sudden urges to use the restroom, sometimes with blood in her stool. She even went to the hospital one day when her symptoms were severe, she said, and she was told it might be a stomach ulcer before being sent home.

“That was around the time when Chadwick Boseman, the actor, passed away. I remember watching him on the news and having the same symptoms,” Lawson said of the “Black Panther” star who died of colon cancer at age 43 in August 2020.

“But at that time, I was not thinking ‘this is something that I’m going through,’ ” she said.

Instead, Lawson thought changing her diet would help. She stopped eating certain red meats and ate more fruits and vegetables. She began losing a lot of weight, which she thought was the result of her new diet.

“But then I went for a physical,” Lawson said.

Her primary care physician recommended that she see a gastroenterologist immediately because she had low iron levels.

“When I went and I saw my gastro, she said, ‘I’m sorry, I have bad news. We see something. We sent it off to get testing. It looks like it is cancer.’ My whole world just kind of blanked out,” Lawson said. “I was 35, healthy, going about my day, raising my daughter, and to get a diagnosis like this, I was just so shocked.”

Lawson, who was diagnosed with stage III rectal cancer, is among a growing group of colon and rectal cancer patients in the United States who are diagnosed at a young age.

The share of colorectal cancer diagnoses among adults younger than 55 in the US has been rising since the 1990s, and no one knows why.

Researchers at Dana-Farber Cancer Institute are calling for more work to be done to understand, prevent and treat colorectal cancer at younger ages.

In a paper published last week in the journal Science, the researchers, Dr. Marios Giannakis and Dr. Kimmie Ng, outlined a way for scientists to accelerate their investigations into the puzzling rise of colorectal cancer among younger ages, calling for more specialized research centers to focus on younger patients with the disease and for diverse populations to be included in studies on early-onset colorectal cancer.

Their hope is that this work will help improve outcomes for young colorectal cancer patients like Lawson.

Among younger adults, ages 20 to 49, colorectal cancer is estimated to become the leading cause of cancer-related deaths in the United States by 2030.

Lawson, now 36 and living in Palm Bay, Florida, with her 5-year-old daughter, is in remission and cancer-free.

The former middle school teacher had several surgeries and received radiation therapy and chemotherapy to treat her cancer. She is now being monitored closely by her doctors.

For other young people with colorectal cancer, “my words of hope would be to just stay strong. Just find that courage within yourself to say, ‘You know what, I’m going to fight this.’ And I just looked within myself,” Lawson said.

“I also have a very supportive family system, so they were definitely there for me. But it was very emotional,” she said of her cancer treatments.

“I remember crying through chemotherapy sessions and the medicine making you so weak, and my daughter was 4, and having to be strong for her,” she said. “My advice to any young person: If you see symptoms or you see something’s not right and you’re losing a lot of weight and not really trying to, go to see a doctor.”

Signs and symptoms of colorectal cancer include changes in bowel habits, rectal bleeding or blood in the stool, cramping or abdominal pain, weakness and fatigue, and weight loss.

A report released this month by the American Cancer Society shows that the proportion of colorectal cancer cases among adults younger than 55 increased from 11% in 1995 to 20% in 2019. Yet the factors driving that rise remain a mystery.

There’s probably more than just one cause, said Lawson’s surgeon, Dr. Steven Lee-Kong, chief of colorectal surgery at Hackensack University Medical Center in New Jersey.

He has noticed an increase in colorectal cancer patients in their 40s and 30s within his own practice. His youngest patient was 21 when she was diagnosed with rectal cancer.

“There is a phenomenon of decreasing overall colorectal cancer rates in the population in general, we think because of the increase in screening for particularly for older adults,” Lee-Kong said. “But that doesn’t really account for the overall increase in the number of patients younger than, say, 50 and 45 that are developing cancer.”

Some of the factors known to raise anyone’s risk of colorectal cancer are having a family history of the disease, having a certain genetic mutation, drinking too much alcohol, smoking cigarettes or being obese.

“They were established as risk factors in older cohorts of patients, but they do seem to be also associated with early-onset disease, and those are things like excess body weight, lack of physical activity, high consumption of processed meat and red meat, very high alcohol consumption,” said Rebecca Siegel, a cancer epidemiologist and senior scientific director of surveillance research at the American Cancer Society, who was lead author of this month’s report.

“But the data don’t support these specific factors as solely driving the trend,” she said. “So if you have excess body weight, you are at a higher risk of colorectal cancer in your 40s than someone who is average weight. That is true. But the excess risk is pretty small. So again, that is probably not what’s driving this increase, and it’s another reason to think that there’s something else going on.”

Many people who are being diagnosed at a younger age were not obese, including some high-profile cases, such as Broadway actor Quentin Oliver Lee, who died last year at 34 after being diagnosed with stage IV colon cancer.

“Anecdotally, in conferences that I’ve attended, that is the word on the street: that most of these patients are very healthy. They’re not obese; they’re very active,” Siegel said, which adds to the mystery.

“We know that excess weight increases your risk, and we know that we’ve had a big increase in body weight in this country,” she said. “And that is contributing to more cancer for a lot of cancers and also for colorectal cancer. But does it explain this trend that we’re seeing, this steep increase? No, it doesn’t.”

Yet scientists remain divided when it comes to just how much of a role those known risk factors – especially obesity – play in the rise of colorectal cancer among adults younger than 55.

Even though the cause of the rise of colorectal cancer in younger adults is “still not very well understood,” Dr. Subhankar Chakraborty argues that dietary and lifestyle factors could be playing larger roles than some would think.

“We know that smoking, alcohol, lack of physical activity, being overweight or obese, increased consumption of red meat – so basically, dietary factors and environmental and lifestyle factors – are likely playing a big role,” said Chakraborty, a gastroenterologist with The Ohio State University Comprehensive Cancer Center.

“There are also some other factors, such as the growing incidence of inflammatory bowel disease, that may also be playing a role, and I think the biggest factors is most likely the diet, the lifestyle and the environmental factors,” he said.

It has been difficult to pinpoint causes of the rise of cases in younger ages because, if someone has a polyp in their colon for example, it can take 10 to 15 years to develop into cancer, he says.

“During that, all the way from a polyp to the cancer stage, the person is exposed to a variety of things in their life. And to really pinpoint what is going on, we would need to follow specific individuals over time to really understand their dietary patterns, medications and weight changes,” Chakraborty said. “So that makes it really hard, because of the time that cancer actually takes to develop.”

Some researchers have been investigating ways in which the rise in colorectal cancer among younger adults may be connected to increases in childhood obesity in the US.

“The rise in young-onset colorectal cancer correlates with a doubling of the prevalence of childhood obesity over the last 30 years, now affecting 20% of those under age 20,” Dr. William Karnes, a gastroenterologist and director of high-risk colorectal cancer services at the UCI Health Digestive Health Institute in California, said in an email.

“However, other factors may exist,” he said, adding that he has noticed “an increasing frequency of being shocked” by discoveries of colorectal cancer in his younger patients.

There could be correlations between obesity in younger adults, the foods they eat and the increase in colorectal cancers for the young adult population, said Dr. Shane Dormady, a medical oncologist from El Camino Health in California who treats colorectal cancer patients.

“I think younger people are on average consuming less healthy food – fast food, processed snacks, processed sugars – and I think that those foods also contain higher concentrations of carcinogens and mutagens, in addition to the fact that they are very fattening,” Dormady said.

“It’s well-publicized that child, adolescent, young adult obesity is rampant, if not epidemic, in our country,” he said. “And whenever a person is at an unhealthy weight, especially at a young age, which is when the cells are most susceptible to DNA damage, it really starts the ball rolling in the wrong direction.”

Yet at the Center for Young Onset Colorectal and Gastrointestinal Cancers at Memorial Sloan Kettering Cancer Center, researchers and physicians are not seeing a definite correlation between the rise in colorectal cancer among their younger adult patients and a rise in obesity, according to Dr. Robin Mendelsohn, gastroenterologist and co-director of the center, where scientists and doctors continue to work around the clock to solve this mystery.

“When we looked at our patients, the majority were more likely to be overweight and obese, but when we compare them to a national cohort without cancer, they’re actually less likely to be overweight and obese,” she said. “And anecdotally, a lot of the patients that we see are young and fit and don’t really fit the obesity profile.”

That leaves many oncologists scratching their heads.

Some scientists are also exploring whether genetic mutations that can raise someone’s risk for colorectal cancer have played a role in the rise of cases among younger adults – but the majority of these patients do not have them.

Karnes, of UCI Health, said “it is unlikely” that there has been an increase in the genetic mutations that raise the risk of colorectal cancer, “although, as expected, the percentage of colorectal cancers caused by such mutations, e.g., Lynch syndrome, is more common in people with young-onset colorectal cancer.”

Lynch syndrome is the most common cause of hereditary colorectal cancer, causing about 4,200 cases in the US per year. People with Lynch syndrome are more likely to get cancers at a younger age, before 50.

“In my practice and in the medical community, the oncologic community, I don’t think there’s any proof that genetic syndromes and gene mutations that patients are born with are becoming more frequent,” El Camino Health’s Dormady said. “I don’t think the inherent frequency of those mutations is going up.”

The tumors of younger colorectal cancer patients are very similar to those of older ones, said Mendelsohn at Memorial Sloan Kettering Cancer Center.

“So then, the question is, if they’re biologically the same, why are we seeing this increasingly in younger people?” she said. “About 20% may have a genetic mutation, so the majority of patients do not have a family history or genetic predisposition.”

Therefore, Mendelsohn added, “it’s likely some kind of exposure, whether it be diet, medication, changing microbiome,” that is driving the rise in colorectal cancers in younger adults.

That rise “has been something that’s been on our radar, and it has been increasing since the 1990s,” Mendelsohn said. “And even though it is increasing, the numbers are still small. So it’s still a small population.”

Dormady, at El Camino Health, said he now sees more colorectal cancer patients in their early to mid-50s than he did 20 years ago, and he wonders whether it might be a result of colorectal cancer screening being easier to access and better at detecting cancers.

“The first thing to consider is that some of our diagnostic modalities are becoming better,” he said, especially because there are now many at-home colorectal cancer testing kits. Also, in 2021, the US Preventive Services Task Force lowered the recommended age to start screening for colon and rectal cancers from 50 to 45.

“I think you have a subset of patients who are being screened earlier with colonoscopies; you have advancing technology where we can potentially detect tumor cell DNA in the stool sample, which is leading to earlier diagnosis. And sometimes that effect will skew statistics and make it look like the incidence is really on the rise, but deeper analysis shows you that part of that is due to earlier detection and more screening,” he said. “So that could be one facet of the equation.”

Overall, pinpointing what could be driving this surge in colorectal cancer diagnoses among younger ages will not only help scientists better understand cancer as a disease, it will help doctors develop personalized risk assessments for their younger patients, Ohio State University’s Chakraborty said.

“Because most of the people who go on to develop colorectal cancer really have no family history – no known family history of colon cancer – so they would really not be aware of their risk until they begin to develop symptoms,” he said.

“Having a personalized risk assessment tool that will take into account their lifestyle, their environmental factors, genetic factors – I think if we have that, then it would allow us hopefully, in the future, to provide some personalized recommendations on when a person should be screened for colorectal cancer and what should be the modality of screening based on their risk,” he said. “Younger adults tend to develop colon cancer mostly in the left side, whereas, as we get older, colon cancer tends to develop more on the right side. So there’s a little difference in how we could screen younger adults versus older adults.”

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Report shows ‘troubling’ rise in colorectal cancer among US adults younger than 55 | CNN



CNN
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Adults across the United States are being diagnosed with colon and rectal cancers at younger ages, and now 1 in 5 new cases are among those in their early 50s or younger, according to the American Cancer Society’s latest colorectal cancer report.

The report says that the proportion of colorectal cancer cases among adults younger than 55 increased from 11% in 1995 to 20% in 2019. There also appears to be an overall shift to more diagnoses of advanced stages of cancer. In 2019, 60% of all new colorectal cases among all ages were advanced.

“Anecdotally, it’s not rare for us now to hear about a young person with advanced colorectal cancer,” said Dr. William Dahut, chief scientific officer for the American Cancer Society. For example, Broadway actor Quentin Oliver Lee died last year at 34 after being diagnosed with stage IV colon cancer, and in 2020, “Black Panther” star Chadwick Boseman died at 43 of colon cancer.

“It used to be something we never heard or saw this, but it is a high percentage now of colorectal cancers under the age of 55,” Dahut said.

Although it’s difficult to pinpoint a cause for the rise in colorectal cancers among younger adults, he said, some factors might be related to changes in the environment or people’s diets.

“We’re not trying to blame anybody for their cancer diagnosis,” Dahut said. “But when you see something occurring in a short period of time, it’s more likely something external to the patient that’s driving that, and it’s hard not to at least think – when you have something like colorectal cancer – that something diet-related is not impossible.”

The new report also says that more people are surviving colorectal cancer, with the relative survival rate at least five years after diagnosis rising from 50% in the mid-1970s to 65% from 2012 through 2018, partly due to advancements in treatment.

That’s good news, said Dr. Paul Oberstein, a medical oncologist at NYU Langone Perlmutter Cancer Center, who was not involved in the new report. The overall trends suggest that colorectal cancer incidence and death rates have been slowly declining.

“If you look at the overall trends, the incidence of colon cancer in this report has decreased from 66 per 100,000 in 1985 to 35 per 100,000 in 2019 – so almost half,” Oberstein said.

“Changes in the mortality rate are even more impressive,” he said. “In 1970, which was a long time ago, the rate of colorectal cancer death was 29.2 per 100,000 people, and in 2020, it was 12.6 per 100,000. So a dramatic, over 55% decline in deaths per 100,000 people.”

Colorectal cancer is the second most common cause of cancer death in the United States, and it is the leading cause of cancer-related deaths in men younger than 50.

Dahut said the best way to reduce your risk of colorectal cancer is to follow screening guidelines and get a stool-based test or a visual exam such as a colonoscopy when it’s recommended. Any suspicious polyps can be removed during a visual exam, reducing your risk of cancer.

“At the ACS, we recommend if you’re at average risk, you start screening at age 45,” Dahut said. “Usually, then your subsequent screening is based on the results of that screening test.”

For the new report, researchers at the American Cancer Society analyzed data from the National Cancer Institute and the US Centers for Disease Control and Prevention on cancer screenings, cases and deaths.

The researchers found that from 2011 through 2019, colorectal cancer rates increased 1.9% each year in people younger than 55. And while overall colorectal cancer death rates fell 57% between 1970 and 2020, among people younger than 50, death rates continued to climb 1% annually since 2004.

“We know rates are increasing in young people, but it’s alarming to see how rapidly the whole patient population is shifting younger, despite shrinking numbers in the overall population,” Rebecca Siegel, senior scientific director of surveillance research at the American Cancer Society and lead author of the report, said in a news release. “The trend toward more advanced disease in people of all ages is also surprising and should motivate everyone 45 and older to get screened.”

Some regions of the United States appeared to have higher rates of colorectal cancers and deaths than others. These rates were lowest in the West and highest in Appalachia and parts of the South and the Midwest, the data showed. The incidence of colorectal cancer ranged from 27 cases per 100,000 people in Utah to 46.5 per 100,000 in Mississippi. Colorectal cancer death rates ranged from about 10 per 100,000 people in Connecticut to 17.6 per 100,000 in Mississippi.

There were some significant racial disparities, as well. The researchers found that colorectal cancer cases and deaths were highest in the American Indian/Alaska Native and Black communities. Among men specifically, the data showed that colorectal cancer death rates were 46% higher in American Indian/Alaska Native men and 44% higher in Black men compared with White men.

The report also says that more left-sided tumors have been diagnosed, meaning an increasing percentage of tumors are happening closer to the rectum. The proportion of colorectal cancers in that location has steadily climbed from 27% in 1995 to 31% in 2019.

“Historically, we’ve been worried more about the tumors on what we call the right side,” said NYU Langone’s Oberstein.

“But the incidence increasing, especially among young people, seems to be happening not only in those worse tumors but the ones that we think are not as bad,” he said, referring to left-sided tumors. “It’s raising questions about whether something is changing about the risks and the future people who are going to get colon cancer.”

Looking forward, the researchers estimate that there will be 153,020 colorectal cancer cases diagnosed in the US this year and an estimated 52,550 colorectal cancer deaths, with 3,750 of them – or 7% – among people younger than 50.

“These highly concerning data illustrate the urgent need to invest in targeted cancer research studies dedicated to understanding and preventing early-onset colorectal cancer,” Dr. Karen Knudsen, CEO of the American Cancer Society, said in the news release. “The shift to diagnosis of more advanced disease also underscores the importance of screening and early detection, which saves lives.”

The report’s findings, including the rise in colorectal cancer in younger adults, are “troubling,” Dr. Joel Gabre, an expert in gastrointestinal cancers at Columbia University Irving Medical Center, said in an email.

“It reflects other recent published findings demonstrating a rising incidence of colorectal cancer in young people. Most concerning to me, however, is a lack of clear cause and patients being diagnosed late. I think this is an area where more funding for research is needed to understand this really concerning rise,” wrote Gabre, who was not involved in the report.

Gabre says he knows what it’s like to look into his young patients’ eyes and tell them they have colorectal cancer, and “it’s devastating.”

“They have young families and so much of their life ahead of them. That’s why I encourage my patients who are age 45 years and older to get screened,” Gabre said. “I also encourage people to let their doctor know if they have a family history of colon cancer. There is genetic testing we can do to identify some at-risk patients early before they develop cancer.”

The findings highlight the importance of colorectal cancer screening, Dr. Robin Mendelsohn, gastroenterologist and co-director of the Center for Young Onset Colorectal and Gastrointestinal Cancers at Memorial Sloan Kettering Cancer Center, said in an email.

“The age to start screening was recently decreased to 45, which will help in an effort to screen more people, but we still need to understand more why we are seeing this increase which is something we are actively looking into,” wrote Mendelsohn, was not involved in the new report.

Mendelsohn says she has seen an increase in advanced colorectal cancers and diagnoses among her younger patients, and she says to watch for symptoms such as rectal bleeding, abdominal pain and changes in bowel habits.

“Until we understand more, it is important that patients and providers recognize these symptoms so they can be evaluated promptly,” she said. “And, if you are at an age to get screened, please get screened.”

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Cancer screenings could be back to normal after millions missed during Covid-19 pandemic | CNN



CNN
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Millions of people across the United States missed routine cancer screenings during the second year of the Covid-19 pandemic, with the prevalence of screening for breast, cervical and prostate cancers in the previous year falling anywhere from 6% to 15% between 2019 and 2021, according to a new study from the American Cancer Society.

“We were thinking there would be a rebound in late 2020,” said Dr. William Dahut, chief scientific officer of the American Cancer Society. “We were surprised to see the continued increase in the number of folks not getting their screenings.”

But more recently, it appears that people are starting to return to routine screenings at rates seen before the pandemic, separate research suggests.

Rates of screening for breast, cervical and colon cancers may have returned to normal, according to more recent data published last week in the journal Epic Research, which is owned by the health care software company Epic.

“As screening rates returned to normal from the drop we previously reported, rates of cancer diagnosis returned to normal as well,” Dr. Chris Alban, a clinical informaticist at Epic Research, wrote in an email.

“We haven’t seen evidence that the screenings missed during the pandemic resulted in worsened patient outcomes, though we plan to monitor this trend to see whether it holds over time,” he said. “The recommended intervals between screenings for a given cancer can be several years, so evidence of advanced cancers can take a long time to appear.”

Due to the declines in cancer screenings as well as barriers to accessing treatment in the early days of the pandemic, not only did physicians nationwide worry that screening and treatment delays led to patients arriving at their offices with advanced cancer, some anecdotally reported seeing upticks in advanced cancers at the time.

The prevalence of screening for breast, cervical and prostate cancers did not return to pre-pandemic levels in 2021, the second year of the Covid-19 pandemic, according to the American Cancer Society’s new study, published Thursday in the Journal of Clinical Oncology.

The study included data on more than 60,000 adults in the United States who were eligible for screening for breast, cervical, prostate and colorectal cancers between 2019 and 2021. The data came from the US Centers for Disease Control and Prevention’s National Health Interview Survey.

The researchers found that between 2019 and 2021, the overall prevalence of eligible adults who completed screening in the previous year fell 6% for breast cancer, 15% for cervical cancer and 10% for prostate cancer. That means there were about 1 million fewer people who got screened for breast cancer, 4.4 million fewer screened for cervical cancer and about 700,000 fewer screened for prostate cancer.

“These declines have significant public health implications as they are expected to lead to more advanced stage cancer diagnosis in the future,” the researchers wrote.

The prevalence of screening for colorectal cancer was unchanged, the researchers found.

The growing popularity of at-home colon cancer screening tests probably offset any decline in colorectal cancer screenings, they wrote.

The researchers also found some racial differences, as the Asian community had the largest declines in breast, cervical and prostate cancer screenings.

“These findings are especially concerning as cancer is the leading cause of death in both Asian American men and women,” wrote the researchers, all from the American Cancer Society.

Dahut said that anyone who missed a routine cancer screening during the early days of the pandemic should catch up now.

“Even in the best of times, the number of folks who are screened is far too low,” he said. “Go ahead and follow the guidelines, get screened when appropriate, and the outcomes will be better.”

The Epic Research study involved data on 373,574 cancer diagnoses entered in patients’ charts in the US between January 2018 and December 2022.

The data came from 190 health care organizations that use software from Epic for their electronic health records. Together, these organizations represent 1,123 hospitals and more than 22,500 clinics, and they agreed to contribute to the de-identified data set, meaning no individual patient can be identified within the data.

The data showed a clear decrease in cancer cases early in the pandemic, which correlates with a decline in screening, but screening rates appeared to return to normal last year, as did cancer detection rates. The data also did not appear to show a significant rise in new diagnoses of advanced cancers through the end of last year.

It’s “good news” that the data demonstrate a return to pre-Covid rates of cancer screening, Dr. Arif Kamal, the American Cancer Society’s chief patient officer – who was not involved in the Epic Research study – wrote in an email. He called the new data intriguing but emphasized that more time is needed to determine whether or when rates of advanced cancers may increase due to missed screenings. It could take years.

“Conclusions regarding whether advanced cancer rates have increased due to missed screenings are a bit premature to reach. This is because cancer takes years to develop, and the resulting effect of missed cancers cannot be known after only a few years,” Kamal said.

“We remain hopeful that as cancer screening rates have returned to baseline, that the two years of missed screenings will not have a long-lasting effect on cancer incident or mortality,” he said. “But more time will tell.”

The data from Epic Research’s study is encouraging, as it suggests that more advanced cancers are not being seen, Dr. David Cohn, chief medical officer for the Ohio State University Comprehensive Cancer Center, wrote in an email.

“Whether this holds up over the next few years is yet to be seen,” he added.

Cohn, a practicing gynecologic oncologist who was not involved in either new study, said that he is “always concerned” about a decrease in screening rates and the resulting impact on later cancer diagnoses.

Yet “these data suggest that folks are getting back to the core business of screening,” he said, “such that these data will hopefully hold up over the next few years without seeing an increase in later diagnoses.”

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