Tag: cancer screening and detection

Breast density changes over time could be linked to breast cancer risk, study finds | CNN

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CNN
 — 

Breast density is known to naturally decrease as a woman ages, and now a study suggests that the more time it takes for breast density to decline, the more likely it is that the woman could develop breast cancer.

Researchers have long known that women with dense breasts have a higher risk of breast cancer. But according to the study, published last week in the journal JAMA Oncology, the rate of breast density changes over time also appears to be associated with the risk of cancer being diagnosed in that breast.

“We know that invasive breast cancer is rarely diagnosed simultaneously in both breasts, thus it is not a surprise that we have observed a much slower decline in the breast that eventually developed breast cancer compared to the natural decline in density with age,” Shu Jiang, an associate professor of surgery at Washington University School of Medicine in St. Louis and first author of the new study, wrote in an email.

Breast density refers to the amount of fibrous and glandular tissue in a person’s breasts compared with the amount of fatty tissue in the breasts – and breast density can be seen on a mammogram.

“Because women have their mammograms taken annually or biennially, the change of breast density over time is naturally available,” Jiang said in the email. “We should make full use of this dynamic information to better inform risk stratification and guide more individualized screening and prevention approaches.”

The researchers, from Washington University School of Medicine in St. Louis and Brigham and Women’s Hospital in Boston, analyzed health data over the course of 10 years among 947 women in the St. Louis region who completed routine mammograms. A mammogram is an X-ray picture of the breast that doctors use to look for early signs of breast cancer.

The women in the study were recruited from November 2008 to April 2012, and they had gotten mammograms through October 2020. The average age of the participants was around 57.

Among the women, there were 289 cases of breast cancer diagnosed, and the researchers found that breast density was higher at the start of the study for the women who later developed breast cancer compared with those who remained cancer-free.

The researchers also found that there was a significant decrease in breast density among all the women over the course of 10 years, regardless of whether they later developed breast cancer, but the rate of density decreasing over time was significantly slower among breasts in which cancer was later diagnosed.

“This study found that evaluating longitudinal changes in breast density from digital mammograms may offer an additional tool for assessing risk of breast cancer and subsequent risk reduction strategies,” the researchers wrote.

Not only is breast density a known risk factor for breast cancer, dense breast tissue can make mammograms more difficult to read.

“There are two issues here. First, breast density can make it more difficult to fully ‘see through’ the breast on a mammogram, like looking through a frosted glass. Thus, it can be harder to detect a breast cancer,” Dr. Hal Burstein, clinical investigator in the Breast Oncology Center at Dana-Farber Cancer Institute, who was not involved in the new study, said in an email. “Secondly, breast density is often thought to reflect the estrogen exposure or estrogen levels in women, and the greater the estrogen exposure, the greater the risk of developing breast cancer.”

In March, the US Food and Drug Administration published updates to its mammography regulations, requiring mammography facilities to notify patients about the density of their breasts.

“Breast density can have a masking effect on mammography, where it can be more difficult to find a breast cancer within an area of dense breast tissue,” Jiang wrote in her email.

“Even when you take away the issue of finding it, breast density is an independent risk factor for developing breast cancer. Although there is lots of data that tell us dense breast tissue is a risk factor, the reason for this is not clear,” she said. “It may be that development of dense tissue and cancer are related to the same biological processes or hormonal influences.”

The findings of the new study demonstrate that breast density serves as a risk factor for breast cancer – but women should be aware of their other risk factors too, said Dr. Maxine Jochelson, chief of the breast imaging service at Memorial Sloan Kettering Cancer Center in New York, who was not involved in the study.

“It makes sense to some extent that the longer your breast stays dense, theoretically, the more likely it is to develop cancer. And so basically, it expands on the data that dense breasts are a risk,” Jochelson said, adding that women with dense breasts should ask for supplemental imaging when they get mammograms.

But other factors that can raise the risk of breast cancer include having a family history of cancer, drinking too much alcohol, having a high-risk lesion biopsied from the breast or having a certain genetic mutation.

For instance, women should know that “density may not affect their risk so much if they have the breast cancer BRCA 1 or 2 mutation because their risk is so high that it may not make it much higher,” Jochelson said.

Some ways to reduce the risk of breast cancer include keeping a healthy weight, being physically active, drinking alcohol in moderation or not at all and, for some people, taking medications such as tamoxifen and breastfeeding your children, if possible.

“Breast density is a modest risk factor. The ‘average’ woman in the US has a 1 in 8 lifetime chance of developing breast cancer. Women with dense breasts have a slightly greater risk, about 1 in 6, or 1 in 7. So the lifetime risk goes up from 12% to 15%. That still means that most women with dense breasts will not develop breast cancer,” Burstein said in his email.

“Sometimes radiologists will recommend additional breast imaging to women with dense breast tissue on mammograms,” he added.

The US Preventive Services Task Force – a group of independent medical experts whose recommendations help guide doctors’ decisions – recommends biennial screening for women starting at age 50. The task force says that a decision to start screening earlier “should be an individual one.” Many medical groups, including the American Cancer Society and Mayo Clinic, emphasize that women have the option to start screening with a mammogram every year starting at age 40.

“It’s also very clear that breast density tends to be highest in younger women, premenopausal women, and for almost all women, it tends to go down with age. However, the risk of breast cancer goes up with age. So these two things are a little bit at odds with each other,” said Dr. Freya Schnabel, director of breast surgery at NYU Langone’s Perlmutter Cancer Center and professor of surgery at NYU Grossman School of Medicine in New York, who was not involved in the new study.

“So if you’re a 40-year-old woman and your breasts are dense, you could think about that as just being really kind of age-appropriate,” she said. “The take-home message that’s very, very practical and pragmatic right now is that if you have dense breasts, whatever your age is, even if you’re postmenopausal – maybe even specifically, if you are postmenopausal – and your breasts are not getting less dense the way the average woman’s does, that it really is a reason to seek out adjunctive imaging in addition to just mammography, to use additional diagnostic tools, like ultrasound or maybe even MRI, if there are other risk factors.”

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New study suggests Black women should be screened earlier for breast cancer | CNN

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CNN
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A new study on breast cancer deaths raises questions around whether Black women should screen at earlier ages.

An international team of researchers wrote in the study, published Wednesday in the journal JAMA Network Open, that clinical trials may be warranted to investigate whether screening guidelines should recommend Black women start screening at younger ages, around 42 instead of 50.

The US Preventive Services Task Force – a group of independent medical experts whose recommendations help guide doctors’ decisions – recommends biennial screening for women starting at age 50. The Task Force says that a decision to start screening prior to 50 “should be an individual one.” Many medical groups, including the American Cancer Society and Mayo Clinic, already emphasize that women have the option to start screening with a mammogram every year starting at age 40.

Even though Black women have a 4% lower incidence rate of breast cancer than White women, they have a 40% higher breast cancer death rate.

“The take-home message for US clinicians and health policy makers is simple. Clinicians and radiologists should consider race and ethnicity when determining the age at which breast cancer screening should begin,” Dr. Mahdi Fallah, an author of the new study and leader of Risk Adapted Cancer Prevention Group at the German Cancer Research Center in Heidelberg, Germany, said in an email.

“Also, health policy makers can consider a risk-adapted approach to breast cancer screening to address racial disparities in breast cancer mortality, especially the mortality before the recommended age of population screening,” said Fallah, who is also a visiting professor at Lund University in Sweden and an adjunct professor at the University of Bern in Switzerland.

Breast cancer screenings are typically performed using a mammogram, which is an X-ray picture taken of the breast that doctors examine to look for early signs of breast cancer developing.

“Guidelines for screening actually already do recommend basing a woman’s time to initiate screening on the risk of developing cancer, though race and ethnicity have not been traditional factors that go into these decisions,” Dr. Rachel Freedman, a breast oncologist at Dana-Farber Cancer Institute, who was not involved in the new study, said in an email.

The American Cancer Society currently recommends that all women consider mammogram screenings for breast cancer risk starting at the age of 40 – and for women 45 to 54, it’s recommended to get mammograms every year. Those 55 and older can switch to screening every other year if they choose.

But “we are in the process of updating our breast cancer screening guidelines, and we are examining the scientific literature for how screening guidelines could differ for women in different racial and ethnic groups, and by other risk factors, in a way that would reduce disparities based on risk and disparities in outcome,” Robert Smith, senior vice president for cancer screening at the American Cancer Society, who was not involved in the new study, said in an email. “We are examining these issues closely.”

The American Cancer Society’s recommendations appear to align with the findings in the new study, as the research highlights how screening guidelines should not be a “one-size-fits-all policy,” but rather help guide conversations that patients and their doctors have together.

“We, here at the American Cancer Society, strongly recommend that all women consider a screening mammogram from the age of 40 onwards, and that means having a discussion with their doctor,” said Dr. Arif Kamal, the American Cancer Society’s chief patient officer, who was not involved in the new study.

“The authors highlight that age 50 can be a little late,” Kamal said about the study’s findings on when to begin breast cancer screening. “We are in agreement with that, particularly for women who may be at slightly higher risk.”

The researchers – from China, Germany, Sweden, Switzerland and Norway – analyzed data on 415,277 women in the United States who died of breast cancer in 2011 to 2020. That data on invasive breast cancer mortality rates came from the National Center for Health Statistics and was analyzed with the National Cancer Institute’s SEER statistical software.

When the researchers examined the data by race, ethnicity and age, they found that the rate of breast cancer deaths among women in their 40s was 27 deaths per 100,000 person-years for Black women compared with 15 deaths per 100,000 in White women and 11 deaths per 100,000 in American Indian, Alaska Native, Hispanic and Asian or Pacific Islander women.

“When the breast cancer mortality rate for Black women in their 40s is 27 deaths per 100,000 person-years, this means 27 out of every 100,000 Black women aged 40-49 in the US die of breast cancer during one year of follow-up. In other words, 0.027% of Black women aged 40-49 die of breast cancer each year,” Fallah said in the email.

In general, for women in the United States, their average risk of dying from breast cancer in the decade after they turn 50, from age 50 to 59, is 0.329%, according to the study.

“However, this risk level is reached at different ages for women from different racial/ethnic groups,” Fallah said. “Black women tend to reach this risk level of 0.329% earlier, at age 42. White women tend to reach it at age 51, American Indian or Alaska Native and Hispanic women at age 57 years, and Asian or Pacific Islander women later, at age 61.”

So, the researchers determined that when recommending breast cancer screening at age 50 for women, Black women should start at age 42.

Yet “the authors didn’t have any information on whether the women included in this study actually had mammographic screening and at what age. For example, it is possible that many women in this study actually had screening during ages 40-49,” Freedman, of the Dana-Farber Cancer Institute, said in her email.

“This study confirms that the age of breast cancer-mortality is younger for Black women, but it doesn’t confirm why and if screening is even the main reason. We have no information about the types of cancers women developed and what treatment they had either, both of which impact mortality from breast cancer,” she said.

The harm of starting mammograms at a younger age is that it raises the risk of a false positive screening result – leading to unnecessary subsequent tests and emotional stress.

But the researchers wrote in their study that “the added risk of false positives from earlier screenings may be balanced by the benefits” linked with earlier breast cancer detection.

They also wrote that health policy makers should pursue equity, not just equality, when it comes to breast cancer screening as a tool to help reduce breast cancer death rates.

Equality in the context of breast cancer screening “means that everyone is screened from the same age regardless of risk level. On the other hand, equity or risk-adapted screening means that everyone is provided screening according to their individual risk level,” the researchers wrote. “We believe that a fair and risk-adapted screening program may also be associated with optimized resource allocation.”

The new study is “timely and relevant,” given the overall higher mortality rate for breast cancer in Black women and that Black women are more likely to be diagnosed at a younger age compared with other ethnic groups, Dr. Kathie-Ann Joseph, surgical oncologist at NYU Langone’s Perlmutter Cancer Center and professor of surgery and population health at the NYU Grossman School of Medicine, said in an email.

“While some may argue that earlier screening may lead to increased recalls and unnecessary biopsies, women get recalled for additional imaging about 10% of the time and biopsies are needed in 1-2% of cases, which is quite low,” said Joseph, who was not involved in the new study.

“This has to be compared to the lives saved from earlier screening mammography,” she said. “I would also like to point out that while we certainly want to prevent deaths, earlier screening can have other benefits by allowing women of all racial and ethnic groups to have less extensive surgery and less chemotherapy which impacts quality of life.”

Breast cancer is the most common cancer among women in the United States, except for skin cancers. This year, it is estimated that about 43,700 women will die from the disease, according to the American Cancer Society, and Black women have the highest death rate from breast cancer.

Even though Black women are 40% more likely than White women to die from the disease, Kamal of the American Cancer Society said that the disparity in deaths is not a result of Black women not following the current mammogram guidelines.

Rather, implicit bias in medicine plays a role.

“In the United States, across the country, there are not differences in mammogram screening rates among Black women and White women. In fact, across the entire country, the number is about 75%. We see about 3 in 4 women – Black, White, Hispanic, and Asian – are on time with their mammograms,” Kamal said.

Yet there are multiple timepoints after a patient is diagnosed with breast cancer where they may not receive the same quality of care or access to care as their peers.

“For example, Black women are less likely to be offered enrollment in a clinical trial. That is not because of a stated difference in interest. In fact, the enrollment rate in clinical trials is equal among Black women and White women, if they’re asked,” Kamal said.

“What we have to understand is where the implicit and systemic biases held by patients and their caregivers and their families may exist – those that are held within health systems and even policies and practices that impede everyone having fair and just access to high quality health care,” he said.

Additionally, Black women have nearly a three-fold increased risk of triple-negative breast cancers. Those particular type of cancers tend to be more common in women younger than 40, grow faster than other types of invasive breast cancer and have fewer treatment options.

Black women also tend to have denser breast tissue than White women. Having dense tissue in the breast can make it more difficult for radiologists to identify breast cancer on a mammogram, and women with dense breast tissue have a higher risk of breast cancer.

But such biological differences among women represent just a small part of a much larger discussion around racial disparities in breast cancer, Kamal said.

“There are systemic issues, access to care issues that really go beyond biology,” he said. “The reality is cancer affects everybody and it does not discriminate. Where the discrimination sometimes occurs is after the diagnosis, and that’s really what we need to focus on.”

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

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CNN
 — 

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

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CNN
 — 

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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Many women underestimate breast density as a risk factor for breast cancer, study shows | CNN

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CNN
 — 

Dense breast tissue has been associated with up to a four times higher risk of breast cancer. However, a new study suggests few women view breast density as a significant risk factor.

The study, published in JAMA Network Open, surveyed 1,858 women ages 40 to 76 years from 2019 to 2020 who reported having recently undergone mammography, had no history of breast cancer and had heard of breast density.

Women were asked to compare the risk of breast density to five other breast cancer risk factors: having a first-degree relative with breast cancer, being overweight or obese, drinking more than one alcoholic beverage per day, never having children and having a prior breast biopsy.

“When compared to other known and perhaps more well-known breast cancer risks, women did not perceive breast density as significant of a risk,” said Laura Beidler, an author of the study and researcher at the Dartmouth Institute for Health Policy and Clinical Practice.

For example, the authors report that dense breast tissue is associated with a 1.2 to four times higher risk of breast cancer compared with a two times higher risk associated with having a first-degree relative with breast cancer – but 93% of women said breast density was a lesser risk.

Dense breasts tissue refers to breasts that are composed of more glandular and fibrous tissue than fatty tissue. It is a normal and common finding present in about half of women undergoing mammograms.

The researchers also interviewed 61 participants who reported being notified of their breast density and asked what they thought contributes to breast cancer and how they could reduce their risk. While most women correctly noted that breast density could mask tumors on mammograms, few women felt that breast density could be a risk factor for breast cancer.

Roughly one-third of women thought there was nothing they could do to reduce their breast cancer risk, although there are several ways to reduce risk, including maintaining a healthy, active lifestyle and minimizing alcohol consumption.

Breast density changes over a woman’s lifetime, and is generally higher in women who are younger, have a lower body weight, are pregnant or breastfeeding, or are taking hormone replacement therapy.

The level of breast cancer risk increases with the degree of breast density; however, experts aren’t certain why this is true.

“One hypothesis has been that women who have more dense breast tissue also have higher, greater levels of estrogen, circulating estrogen, which contributes to both the breast density and to the risk of developing breast cancer,” said Dr. Harold Burstein, a breast oncologist at the Dana-Farber Cancer Institute who was not involved in the study. “Another hypothesis is that there’s something about the tissue itself, making it more dense, that somehow predisposes to the development of breast cancer. We don’t really know which one explains the observation.”

Thirty-eight states currently mandate that women receive written notification about their breast density and its potential breast cancer risk following mammography; however, studies have shown that many women find this information confusing.

“Even though women are notified usually in writing when they get a report after a mammogram that says, ‘You have increased breast density,’ it’s kind of just tucked in there at the bottom of the report. I’m not sure that anyone is explaining to them, certainly in person or verbally, what that means,” said Dr. Ruth Oratz, a breast oncologist at NYU Langone’s Perlmutter Cancer Center who was not involved in the study.

“I think what we’ve learned from this study is that we have to do a better job of educating not only the general public of women, but the general public of health care providers who are doing the primary care, who are ordering those screening mammograms,” she added.

Current screening guidelines recommend women of average risk of breast cancer undergo breast cancer screening every one to two years between ages 50 to 74 with the option of beginning at age 40.

Because women with dense breast tissue are considered to have higher than average cancer risks, the authors of the study suggest women with high breast density may benefit from supplemental screening like breast MRI or breast ultrasound, which may detect cancers that are missed on mammograms. Currently, coverage of supplemental screening after the initial mammogram varies, depending on the state and insurance policy.

The authors warn that “supplemental screening not only can lead to increased rates of cancer detection but also may result in more false-positive results and recall appointments.” They say clinicians should use risk assessment tools when discussing tradeoffs associated with supplemental screening.

“Usually, it’s a discussion between the patient, the clinical team, and the radiologist. And it’ll be affected by prior history, by whether there’s anything else of concern on the mammogram, by the patient’s family history. So those are the kinds of things we discuss frequently with patients who are in such situations,” Burstein said.

Breast cancer screening recommendations differ between medical organizations, and experts say women at higher risk due to breast density should discuss with their doctor what screening method and frequency are most appropriate.

“I think it’s really, really important that everyone understands – and this is the doctors, the nurses, the women themselves – that screening is not a one size fits all recommendation. We cannot just make one general recommendation to the entire population because individual women have different levels of risks of developing breast cancer,” Oratz said.

For the nearly one-third of women with dense breast tissue that reported there was nothing they could do to prevent breast cancer, experts say there are some steps you can take to reduce your risk.

“Maintaining an active, healthy lifestyle and minimizing alcohol consumption address several modifiable factors. Breastfeeding can decrease the risk. On the other hand, use of hormone replacement therapy increases breast cancer risk,” said Dr. Puneet Singh, a breast surgical oncologist at the MD Anderson Cancer Center who was not involved in the study.

The researchers add that there are approved medications, such as tamoxifen, that can be given for those at significantly increased risk that may reduce the chances of breast cancer by about half.

Finally, breast cancer doctors say that in addition to appropriate screening, knowing your risk factors and advocating for yourself can be powerful tools in preventing and detecting breast cancer.

“At any age, if any woman feels uncomfortable about something that’s going on in her breast, if she has discomfort, notices a change in the breast, bring that to the attention of your doctor and make sure it gets evaluated and don’t let somebody just brush you off,” Oratz said.

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