Saturday January 25, 2020

Presence of Oral Bacteria Associated With Risk of Pancreatic Cancer

To identify the bacteria, the researchers sequenced the DNA of 35 of the samples that had high amounts of bacterial DNA

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A patient for a regular check up of their teeth.
Picture shows a person's teeth being checked upon.

The presence of oral bacteria in cystic pancreatic tumours is associated with the severity of the tumour, a new study suggests.

According to the researcher, the results can help to reappraise the role of bacteria in the development of pancreatic cysts. If further studies show that the bacteria actually affects the pathological process, it could lead to new therapeutic strategies using antibacterial agents.

“We were surprised to find oral bacteria in the pancreas, but it wasn’t totally unexpected. The bacteria we identified has already been shown in an earlier, smaller study to be higher in the saliva of patients with pancreatic cancer,” said co-author Margaret Sallberg Chen from the Karolinska Institutet in Sweden.

Not all pancreatic tumours are cancerous. For instance there are so-called cystic pancreatic tumours (pancreatic cysts), many of which are benign. A few can, however, become cancerous, the researcher said.

“We find most bacteria at the stage where the cysts are starting to show signs of cancer,” Chen said.

Cancer
Cancer Ribbon. Pixabay

“What we hope is that this can be used as a biomarker for the early identification of the cancerous cysts that need to be surgically removed to cure cancer…” she added.

For the study, published in the journal Gut, the team examined the presence of bacterial DNA in fluid from pancreatic cysts in 105 patients and compared the type and severity of the tumours.

The results showed that the fluid from the cysts with high-grade dysplasia and cancer contained much more bacterial DNA than that from benign cysts.

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To identify the bacteria, the researchers sequenced the DNA of 35 of the samples that had high amounts of bacterial DNA.

They found large variations in the bacterial composition between different individuals, but also a greater presence of certain oral bacteria in fluid and tissue from cysts with high-grade dysplasia and cancer. (IANS)

Next Story

Here’s How a Low Fat Diet May Cut Pancreatic Cancer Risk

Researchers have found links between obesity and pancreatic cancer

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Pancreatic Cancer
There is a significant connection between obesity and Pancreatic Cancer. Lifetime Stock

The sound of the word ‘Cancer is enough to scare anyone because there is no definite cure for it. Pancreatic cancer is one of those cancers in which the overall survival is very bleak as cases are often less sensitive to chemotherapy and radiotherapy. Dr Pradeep Jain, GI Oncosurgery, Medical Oncology, Fortis Hospital, Shalimar Bagh informs you about the connection between obesity and Pancreatic Cancer.

The best method to decrease the mortality (death rate) of these cancers is to either catch them early or prevent them happening. In view of non-availability of any screening test and limitation of diagnostic test, it is almost impossible to catch them very early. As dietary modification has been known for a long time to prevent cancer, it is likely to work in case of pancreatic cancer also.

diet pancreatic cancer
Dietary modification has been known to cut down the risk of developing pancreatic cancer. Lifetime Stock

Pancreatic cancer is associated with obesity and fat consumption as suggested in many epidemiological studies. Consumption of fat has been linked to pancreatic cancer not only directly but also by causing obesity. In obesity there is a general increase in inflammatory conditions in the body which leads to release of some chemicals (cytokines) which have important role in creation of pancreatic cancer.

Fat consumption (mainly saturated fats) have been shown to increase cancer of the pancreas by many observational studies in last 2 decades. In fact a study published (which comprised of more than half million US adults) in journal of the National Cancer Institute in 2009 demonstrated a positive association between dietary intake of total fat, particularly from animal sources. When people taking highest of fat compared to people taking lowest of fat, they are 23 per cent more likely to be diagnosed with pancreatic cancer (the effect was more profound when intake of saturated fat was more).

It is very difficult to comment how does fat consumption lead to pancreatic cancer, but it is likely that fat stimulates the release of an important hormone CCK (Cholecystokinin) for biliary and pancreatic secretion. And this hormone is an important instrument in the growth of pancreatic cancer cells.

In fact, in an experimental study, the antagonist of CCK, Proglumide has shown to decrease the growth of cancer cells and decrease metastasis (spread) potential of cancer.

Pancreatic Cancer
Pancreatic cancer is associated with obesity and fat consumption. Lifetime Stock

Now this leads to an important question whether with diet modification (by reducing content of fat) is it possible to decrease the chances of pancreatic cancer? A recent study published in Nov 2017 issue of AICR’S cancer research update) have found that older women who are overweight or obese had lowered the risk of getting pancreatic cancer by following a low fat diet plan.

Some were arranged to eat less fat and more vegetables, fruits and grains (the intervention group) other followed their normal diet (the comparison group). After 15 years of follow up, 92 cases of pancreatic cancer were identified in the intervention group and 165 in the comparison group. This translates to a rate of 35 cases per 100,000 in the intervention group and 41 per 100,000 in the comparison group.

Low fat diet was particularly effective in reducing cancer risk in over weight and obese post-menopausal woman. A low fat diet was not found to lower the disease risk for women whose weight was normal.

Also Read- Here’s How Sugar Relates to Cancer

Though these evidences support that high fat consumption may increase the chances of pancreatic cancer and by reducing the fat consumption the incidence of cancer may decrease, but these cannot be considered as very strong evidence to support a ‘cause and effect’. But this can be considered at least a caution to decrease fat (particularly animal fat) consumption in diet.

Foods that are sources of saturated or trans fats are butter, margarine (stick), coconut oil, palm oil, vegetable oil and hydrogenated oil. We should motivate the general public to consume more of fibre and exercise and reduce saturated fat content from diet. (IANS)