In case you’re wondering why there’s all this mindfulness stuff on a cancer blog, here’s a reason: a recently published article in Science – Translational Medicine (Perego et al., 2020) provides laboratory evidence for the benefits of reducing stress levels for cancer survivors. It has to do with the effects of stress hormones on cancer recurrence.
In this study researchers looked at the cancer cells that are sometimes pushed into dormancy by treatments like chemotherapy. Cancer recurrence may be a result of such cells being activated again at some point in the future.
Perego and colleagues were able to recreate such dormant cancer cells in the lab, then found that they could awaken them again using neutrophils, a type of white blood cell that, under certain circumstances, can be harnessed by tumor cells to aid in their proliferation.
Those “certain circumstances” turn out to involve stress hormones. The researchers found that stress hormone + neutrophils = woken cancer cells. The process is a cascade of events: the stress hormones caused the neutrophils to produce S100 proteins, which in turn created lipids, and it was those lipids that caused hibernating cancer cells to stretch and rub the sleep out of their eyes.
Keep in mind that these studies were conducted in petri dishes (for “proof of concept”) and then in mice, which does not equate to eliciting the same response in humans. In fact, the connection between stress and cancer is still inconclusive in human studies, partly because in the past researchers have noted that some of the coping mechanisms that humans use to deal with stress (smoking, drinking, overeating, etc.) may be the more important culprits that lead to cancer.
Nonetheless, Perego and colleagues were able to show that stress and neutrophils may form a path by which dormant cancer cells awaken in humans, leading to cancer recurrence, and this opens the door to more directed future research. Note, this is certainly not the only way that cancer can recur, but it provides an opportunity to develop drugs that can break the cascade and thereby prevent recurrence in some cancer survivors.
To be clear, this doesn’t mean that if a cancer survivor is stressed out their cancer will definitely come back, because there are a number of intermediate steps that need to take place within that cascade, but this is still a good reason to practice stress-reduction techniques. It might help you remain cancer-free.
For a reader-friendly version of this study, go to the National Cancer Institute’s Cancer Currents Blog’s article, “Study Suggests a Link between Stress and Cancer Coming Back”.
If you have access to a university or hospital library, you can look up the original research article using the following PubMed citation (links to abstracts below; once the free full-text PMC version is available, I will link to it here):
Perego M, Tyurin VA, Tyurina YY, Yellets J, Nacarelli T, Lin C, Nefedova Y, Kossenkov A, Liu Q, Sreedhar S, Pass H, Roth J, Vogl T, Feldser D, Zhang R, Kagan VE, Gabrilovich DI. Reactivation of dormant tumor cells by modified lipids derived from stress-activated neutrophils. Sci Transl Med. 2020 Dec 2;12(572):eabb5817. doi: 10.1126/scitranslmed.abb5817. PMID: 33268511.
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