Unraveling the Genetic Prelude to Gastric Cancer

The article discusses research by Coorens et al., which analyzes human stomach tissues to explore the mutational landscapes across normal, precancerous, and cancerous stages. It highlights how normal gastric glands accumulate mutations over time, and how this mutational burden increases in metaplastic glands, potentially setting the stage for cancer. Normal gastric glands accumulate mutations over time primarily due to two factors: the natural aging process and the high turnover of cells. DNA replication errors can occur as cells divide to replenish the gastric epithelium, leading to mutations. Environmental factors such as diet, toxins, and even normal metabolic processes can also introduce DNA damage. These accumulated mutations can then contribute to the development of metaplasia and potentially lead to gastric cancer. This study offers insights into how early mutations in normal tissues could lead to cancer, emphasizing the importance of early detection and understanding mutational processes for cancer prevention.

The findings by Coorens et al. underscore the value of genomic surveillance in seemingly normal tissues. By identifying mutational signatures that appear early in the disease process, researchers may be able to develop biomarkers for early detection or risk assessment. This could pave the way for preventative strategies or targeted surveillance in individuals at higher risk for gastric cancer. Furthermore, understanding the mutational mechanisms at play may guide the development of therapies that interrupt the progression from metaplasia to malignancy.

Links:

https://www.nature.com/articles/d41586-025-00803-y 

https://www.nature.com/articles/s41586-021-03790-y

Jumping Genes: A New Hope for Early Gastric Cancer Detection

 

Gastric cancer remains one of the deadliest forms of cancer, with a survival rate of only 10% for advanced-stage diagnoses. This is largely because most cases are identified only in later stages when treatment options are limited. In contrast, early detection offers a promising 90% survival rate, making early diagnostic tools critical in the fight against this disease. 

A groundbreaking discovery in cancer research focuses on transposons, also known as “jumping genes.” These DNA sequences, which can move to different locations within the genome, were once dismissed as “junk DNA.” However, American scientist and cytogeneticist Barbara McClintock demonstrated that transposons play an essential role in gene expression and regulation. Today, we know that transposons are not only integral to normal cellular processes but also provide valuable insights into disease states, including cancer.   

Bioinformatics scientist Braulio Valdebenito-Maturana used advanced techniques such as single-cell RNA sequencing and spatially resolved RNA sequencing to investigate transposon activation in gastric cancer. Her work revealed that 111 transposons are consistently activated in tumor areas and surrounding tissues of gastric cancer patients. Most importantly, this activation begins early in the disease, suggesting that transposons could serve as biomarkers for early detection. 

This research not only sheds light on the molecular mechanisms underlying gastric cancer but also highlights the potential of transposon-based diagnostics for other cancers. If these findings are validated in larger studies, transposons
could revolutionize cancer screening, offering hope for improved survival rates by enabling earlier intervention. 

 

References: 

https://medicalxpress.com/news/2024-11-genes-early-gastric-cancer.html 

https://www.nature.com/scitable/topicpage/transposons-the-jumping-genes-518/ 

The Parent has a Gene for Cancer - Should the Child Get Preventative Surgery?

The Wall Street Journal wrote a story about cases where a parent has a cancer gene and the child must decide whether or not to get preventative surgery. One case follows Dennis Reilly who lost both of his brothers to stomach cancer and made the decision to have his stomach removed after testing positive for the cancer gene at 68 years old. With his positive diagnosis in the mutation of the CDH1 gene, his daughter also tested positive for the mutation and decided to have her stomach removed as well with preventative surgery. With the rise of genetic testing, more families are able to be tested for common gene mutations likely to cause cancer and make decisions about how to deal with their diagnosis.

Dennis Reilly and his daughter Cailyn Reilly Knapp

CDH1 gene testing is becoming more common with the rise of gene testing for abnormalities in the BRCA1 genes testing for breast cancer. People with mutations in the CDH1 gene has a 55-70% risk of developing Hereditary Diffuse Gastric Cancer (HDGC) which is the deadly and aggressive form of cancer the Reilly family had inherited which is difficult to diagnose until it has already spread, and women also have a 42% lifetime risk of developing breast cancer.

Another case was with 63 year old Kathy Hayes who was diagnosed with breast cancer. Years earlier, her daughter died of stage 4 breast cancer but the connection with the mutation in the HDGC gene were connected until she received her diagnosis. Many of her family members were also tested for the mutations and the results came back positive for many, leading some to have preventative surgery.

I find this article interesting because a diagnosis in one family member with a mutation can save the lives of mamy other family members who may have also inherited the cancer gene. In the case with Mrs. Hayes, it was two late for her daughter, but the connection made from her death and Mrs. Hayes diagnosis helped discover the hereditary gene mutation that lead many members of her family to get tested and get preventative surgery. I have great hopes for the growth of genetic sequencing and the access people have to be able to get tested for many different mutations that could possibly save lives.

Original Article: The Parent Has a Cancer Gene—Should the Child Get Surgery?
Related Information: Hereditary Diffuse Gastric Cancer

Developed Lipid Particle to Fight Gastric Ulcers and Cancer

A bacterium called Helicobacter pylori causes peptic/gastric ulcers, and gastric cancer has been countered by using a newly developed lipid particle with its main ingredient being found in vegetable oil that's called linolenic acid.

The University of California, San Diego Health Sciences has released their results and proved that LipoLLA, the lipid, that contains the linolenic acid found in vegetable oil, has been verified safer and more effective at battling these gastric cancers by testing the H. pylori bacteria in mice rather than normal antibiotics. This particle is defined as a nanoparticle in the field of nano-therapeutics. What it does inside the body is it attaches to the bacteria (membrane-wise) and then the linolenic acid disperses in the bacteria and kills it. The team figured out that by feeding micefluorescent markers to tract the LipoLLa, they measured the bacteria that was left and compared it to the use of normal antibiotics.

However, this is not the first time scientists found a way to stop this bacterium. In Southern Medical University in China, researchers developed an oral vaccine that was also tested in mice.

I found this article interesting because I would not even think to begin to suggest an ingredient found in vegetable oil to come closer to fight cancer and ulcers. The key fact is that the LipoLLa was proven that it would not harm the mice and virtually makes it a safer and more effective drug than normal antibiotics. The brilliance of these scientists is incalculable because they seem to find something new everyday. I'm guessing somewhere in the near future that they'll figure out how to make the medicine using this new particle for human consumption.
Original: http://www.sciencedaily.com/releases/2014/11/141125124802.htm
Supporting article: http://www.sciencedaily.com/releases/2013/12/131219142336.htm