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Possible Link Between Palm Oil and Cancer Spread

Oil palms Credit: Wikipedia

An interesting and potentially important cancer study was just published, but will the results hold up in humans? Researchers found that a diet rich in palm oil, which contains palmitic acid, promoted the spread (metastasizing) of two cancers - oral carcinomas and melanoma skin cancer. In mice.

Palm oil is very commonly used in foods. However, the international team of researchers did not find this occurring with fatty acids that are found in olive oil or flaxseeds. (They contain oleic acid or linoleic acid, which are omega-9 and omega-6 fats.)

What does this mean? In this study, dietary palm oil promoted the spread of existing cancers in mice. If you want to be extra cautious, especially if you already have cancer, avoid palm oil and perhaps instead use olive oil. Professor Benitah, one of the researchers said:

"I think it is too early to determine which type of diet could be consumed by patients with metastatic cancer that would slow down the metastatic process. That said, based on our results one would think that a diet poor in palmitic acid could be effective in slowing down the metastatic process, but much more work is needed to determine this."

Of course further studies are needed in humans. But... it is important to note that extra virgin olive oil is viewed as anti-inflammatory and linked to a lower incidence of some cancers, including breast cancer.

From Medical Xpress: Researchers discover link between dietary fat and the spread of cancer

The study, published in the journal Nature and part-funded by the UK charity Worldwide Cancer Research, uncovers how palmitic acid alters the cancer genome, increasing the likelihood the cancer will spread. The researchers have started developing therapies that interrupt this process and say a clinical trial could start in the next couple of years. 

Metastasis—or the spread—of cancer remains the main cause of death in cancer patients and the vast majority of people with metastatic cancer can only be treated, but not cured. Fatty acids are the building blocks of fat in our body and the food we eat. Metastasis is promoted by fatty acids in our diet, but it has been unclear how this works and whether all fatty acids contribute to metastasis.

Newly published findings, led by researchers at IRB Barcelona, Spain, reveal that one such fatty acid commonly found in palm oil, called palmitic acid, promotes metastasis in oral carcinomas and melanoma skin cancer in mice. Other fatty acids called oleic acid and linoleic acid—omega-9 and omega-6 fats found in foods such as olive oil and flaxseeds—did not show the same effect. Neither of the fatty acids tested increased the risk of developing cancer in the first place.

The research found that when palmitic acid was supplemented into the diet of mice, it not only contributed to metastasis, but also exerts long-term effects on the genome. Cancer cells that had only been exposed to palmitic acid in the diet for a short period of time remained highly metastatic even when the palmitic acid had been removed from the diet.

The researchers discovered that this "memory" is caused by epigenetic changes—changes to how our genes function. The epigenetic changes alter the function of metastatic cancer cells and allow them to form a neural network around the tumor to communicate with cells in their immediate environment and to spread more easily. By understanding the nature of this communication, the researchers uncovered a way to block it and are now in the process of planning a clinical trial to stop metastasis in different types of cancer.

The drugs that are in development for the clinical trial are antibodies being developed by ONA Therapeutics, a start-up co-founded by senior author of the study Professor Salvador Aznar-Benitah, ICREA researcher and head of the Stem Cells and Cancer lab at the Institute for Research in Biomedicine (IRB Barcelona). The company recently secured 30 million Euro from private investors to develop this first-in-class treatment of metastatic cancer. The researchers hope the trial is on track to start in the next couple of years to test their new antibody in several different types of cancer.

"Metastasis is estimated to be responsible for 90% of all cancer deaths—that's around 9 million deaths per year globally. Learning more about what makes cancer spread and—importantly—how to stop it is the way forward to reduce these numbers.

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