Increase in cases of colorectal cancer in young adults – Medical News Bulletin
Posted: March 19, 2020 at 12:48 am
Although colorectal cancer is typically associated with older age-groups, a recent study has found that there is an increase in cases of colorectal cancer in young people between the ages of 20 to 49.
In Canada, colorectal cancer is the third most prevalent cancer among the population. Estimates are that over 12% of all cancers diagnosed in 2020 will be colorectal cancers. Most of the cases occur in people aged 50 or older, and the older a person gets, the greater their risk of contracting this disease. This is why doctors recommend colonoscopies, a test to examine the inside of a colon, as well as newer non-invasive tests for patients aged 50 and older.
There are many factors that have been shown to increase the risk of colorectal cancer in the general population. These include a family history of colorectal cancer, a family or personal history of polyps (non-cancerous growths), diet, exercise levels, smoking, and alcohol consumption. This means that there is a combination of genetic risk factors and environmental factors that can contribute to the growth of cancerous cells.
It seems that colon cancer may not remain a disease common only to older adults. A recent study from England has shown that there is an increase in the number of new cases of colorectal cancer in young adults.
Researchers examined documented cases of colorectal cancers over a 30-year period, from 1985 to 2015, using a database that keeps track of cancer cases in England. They looked at the ages of the affected patients and the location of their cancers, as well as the patients gender, geographic location, and their estimated socioeconomic status. In total, they examined over 1.1 million cases of colorectal cancers over the 30-year span. What they found is that there has been an overall increase in the trends of diagnoses of colorectal cancer in young adults.
The researchers then examined factors that could affect these trends across the population. They found that the incidences were similar between men and women, and did not change based on the geographic location or the estimated socioeconomic status of the patients. This surprised them, since a common risk factor for cancer is obesity, and there is often a higher incidence of childhood obesity in lower socioeconomic areas.
However, according to the researchers, there has been an overall increase in obesity among English youth, regardless of socioeconomic status. This could go a long way to explaining the increase in colorectal cancer diagnoses seen in young adults. Yet, this is only one of many risk factors, and it cannot fully explain the increased incidence.
For example, the researchers found that there was a slightly higher incidence in the South of England as compared to Northern England, despite the South of England benefiting from an overall higher socioeconomic status. The researchers believe this is due to the fact that the population of Southern England has slightly better access to medical services. This can lead to more cases being detected earlier in the patients lives and it would explain some of the differences in the age of diagnoses.
While there is no clear-cut answer as to why there has been an increase in colorectal cancer in young adults, the trend is definitely moving upwards, and medicine will have to adapt to this in order to respond to the needs of all future colorectal cancer patients.
Written by Nancy Lemieux
References:
1. Study reveals rising colorectal cancer rates among young adults. (2020). Retrieved 16 March 2020, from https://www.eurekalert.org/pub_releases/2020-03/w-sr031020.php
2. Chambers, A. (2020). Demographic trends in the incidence of youngonset colorectal cancer: a populationbased study. Retrieved 16 March 2020, from https://bjssjournals.onlinelibrary.wiley.com/doi/full/10.1002/bjs.11486
3. What is colorectal cancer? Canadian Cancer Society. (2020). Retrieved 16 March 2020, from https://www.cancer.ca/en/cancer-information/cancer-type/colorectal/colorectal-cancer/?region=on
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Increase in cases of colorectal cancer in young adults - Medical News Bulletin
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