Investigators from Brigham and Women’s Hospital with collaborators looked at data from more than 134,000 participants from two U.S.-wide prospective cohort studies. The team analyzed dietary patterns as well as DNA from Escherichia coli strains found in more than 1,000 colorectal tumors. The team looked for bacterial strains carrying a distinct genetic island known as polyketide synthase (pks). Pks encodes an enzyme that has been shown to cause mutations in human cells. Overall, the team found that Western diet was associated with colorectal tumors containing high amounts of pks+ E. coli but not with tumors containing little to no amount of pks+ E. coli.Brigham and Women’s Hospital. “Microbial link between Western-style diet and incidence of colorectal cancer uncovered.” ScienceDaily. ScienceDaily, 27 June 2022. www.sciencedaily.com/releases/2022/06/220627124937.htm.
Diet-induced Alteration of Intestinal Stem Cell Function (in mice)
“The first thing we noticed was that the small intestine increases greatly in size on the high-calorie diet,” says study leader Anika Böttcher. “Together with Fabian Theis’ team of computational biologists at Helmholtz Munich, we then profiled 27,000 intestinal cells from control diet and high fat/high sugar diet-fed mice. Using new machine learning techniques, we thus found that intestinal stem cells divide and differentiate significantly faster in the mice on an unhealthy diet.” The researchers hypothesize that this is due to an upregulation of the relevant signaling pathways, which is associated with an acceleration of tumor growth in many cancers. “This could be an important link: Diet influences metabolic signaling, which leads to excessive growth of intestinal stem cells and ultimately to an increased risk of gastrointestinal cancer,” says Böttcher.Helmholtz Zentrum München – German Research Center for Environmental Health. “New link between diet, intestinal stem cells and disease discovered.” ScienceDaily. http://www.sciencedaily.com/releases/2021/11/211119155604.htm (accessed November 27, 2021).
I wonder what Dr. Lustig would say about this study?
Dr. Robert Lustig – The Sugar Pandemic – 2012 Presentation at Yale University and Dr. Robert Lustig on Sugar.
Dead at Just 49 Years Old
Because the birth-cohort effect in cancer suggests that exposures early in life, during childhood or young adulthood, may be crucial, some have begun looking closely at changes to the microbiome. “We know that diet and lifestyle significantly shape our microbiome. They also significantly shape our immune system, which we need to fight off the development of cancer. And so we are hypothesizing that it’s a complex interplay among the microbiome, diet, lifestyle and your immune system,” Ng says.The Colon Cancer Conundrum — https://www.nature.com/articles/d41586-021-03405-6
My cousin died from metastatic colon cancer at age 49.
Colonoscopy – Just Do It (an almost forgotten post)
I came across this post in my collection of unpublished drafts. I thought I posted this but obviously I didn’t. This article link was intended to be posted before Colorectal Cancer Rates Rising in Ages 50-54. Better late than never, I guess.
More than one quarter of colonoscopies carried out in Americans aged 30 to 49 years reveal some type of neoplasm, and slightly over 6% of these patients have advanced cancer, results of a nationally representative endoscopic registry show.One Quarter of 30–49-Year-Olds Have Abnormal Colonoscopy Results – Medscape – Jun 07, 2021. — https://www.medscape.com/viewarticle/952536?src=rss#vp_1
Also see Study Finds Sharp Rise in Colon Cancer and Rectal Cancer Rates Among Young Adults and Diet and Colon Cancer Risk – CBS News.
Colorectal Cancer Rates Rising in Ages 50-54
During the period 1992–2018, there were a total of 101,609 cases of CRC among adults aged 45–59 years. Further analysis showed that the CRC incidence rates rose from 23.4 to 34.0 per 100,000 among people aged 45–49 years and from 46.4 to 63.8 per 100,000 among those aged 50–54 years. Conversely, incidence rates decreased among individuals aged 55–59 years, from 81.7 to 63.7 per 100,000 persons.Colorectal Cancer Rates Rising in People Aged 50 to 54 Years – Medscape – Nov 11, 2021 – https://www.medscape.com/viewarticle/962769?src=rss#vp_2
I am posting a link to this article as I enjoy the effects of 238 grams of Miralax mixed with a gallon of sports beverage and/or water. It certainly takes your mind off of not eating all day.
Dumb and Dumber – Noncompliance with Colonoscopy Post Positive FIT
Results Some 88 013 patients who were FIT positive complied with colonoscopy (males: 56.1%; aged 50–59 years: 49.1%) while 23 410 did not (males: 54.6%; aged 50–59 years: 44.9%).
The 10-year cumulative incidence of CRC was 44.7 per 1000 (95% CI, 43.1 to 46.3) among colonoscopy compliers and 54.3 per 1000 (95% CI, 49.9 to 58.7) in non-compliers, while the cumulative mortality for CRC was 6.8 per 1000 (95% CI, 5.9 to 7.6) and 16.0 per 1000 (95% CI, 13.1 to 18.9), respectively. The risk of dying of CRC among non-compliers was 103% higher than among compliers (adjusted HR, 2.03; 95% CI, 1.68 to 2.44).
Conclusion The excess risk of CRC death among those not completing colonoscopy after a positive faecal occult blood test should prompt screening programmes to adopt effective interventions to increase compliance in this high-risk population.Non-compliance with colonoscopy after a positive faecal immunochemical test doubles the risk of dying from colorectal cancer — https://gut.bmj.com/content/early/2021/03/30/gutjnl-2020-322192?rss=1
Help me understand human behavior. You get a positive FOBT or Cologuard test and your doctor says you need a colonoscopy but you decide not to follow up and follow through with the scope.
Meat Intake and Colorectal Polyps
Meat Intake and Colorectal Polyps
Research professor of medicine Martha Shrubsole, Ph.D., and colleagues at Vanderbilt University Medical Center have published the first study to evaluate intakes of meat, cooking methods and meat mutagens and risk of developing sessile serrated polyps (SSPs, also called sessile serrated lesions). Shrubsole previously reported that consuming high levels of red meat increased the risk of developing all types of polyps, but that the likelihood of developing SSPs was two times greater than the risk of developing adenomas and hyperplastic polyps (HP).
Conventional colorectal adenomas are the precursor lesions for most colorectal cancers. SSPs, however, represent an alternative pathway to carcinogenesis that may account for up to 35 percent of colorectal cancers. Because a diagnostic consensus for SSPs was not reached until 2010, few epidemiologic studies have evaluated risk factors.
Any Polyp Type Raises CRC Risk
A finding of any type of polyp in the colon increases the risk for colorectal cancer (CRC), according to new findings from a large Swedish study.
At 10 years, the cumulative colorectal cancer incidence was 1.6% among patients with hyperplastic polyps, 2.5% among those with sessile serrated polyps, 2.7% for tubular adenomas, 5.1% for tubulovillous adenomas, and 8.6% for villous adenomas, as compared with 2.1% for the control group.
However, a higher risk for colorectal-related death was only observed in patients with sessile serrated polyps, tubulovillous adenomas, or villous adenomas.
The study was published online March 16 in Lancet Gastroenterology & Hepatology.
Boldface sections are mine.
I had my first virtual visit with my physician yesterday. I mentioned that I was postponing my colonoscopy this year for pandemic reasons. She said that’s fine, don’t worry about it. I read this article today. Now I know why I’m on a three year callback.
CRC in UC
Colorectal cancer in ulcerative colitis: a Scandinavian population-based cohort study
© 2020 Elsevier Ltd. All rights reserved.
Scientists uncover how high-fat diet drives colorectal cancer growth
The research, conducted in a mouse model, suggests how lifestyle and genetics converge. The researchers found that animals with an APC mutation, the most common genetic mutation found in humans with colorectal cancer, developed cancer faster when fed a high-fat diet.
The mice with APC mutations developed benign growths called adenomas. In humans, adenomas are common in the intestine and are routinely removed during colonoscopies. These growths normally take decades to turn into malignant adenocarcinomas. Yet the adenomas in these mice quickly turned cancerous when given high-fat diets.
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