Researchers at City of Hope have discovered that cell mutations alone are not always enough to cause cancer; additional factors like chronic inflammation play a critical role in tumor formation. Published in Cancer Discovery, the study challenges traditional cancer prevention strategies by emphasizing the need to target biological triggers beyond mutation-causing pollutants.
The study, led by Dr. Yun Rose Li, found that while mutations are necessary for cancer development, they require a secondary “promoter,” such as chronic inflammation, to ignite tumor growth. For example, not all smokers develop lung cancer, suggesting that inflammation—triggered by factors like obesity or a high-fat diet—acts as the “match” that awakens mutated cells.
Using modern sequencing technologies, the team replicated a 1950s experiment by applying two drugs to skin tissue: one to induce mutations and another to create inflammation. Tumors only formed when both agents were used, confirming that mutations alone are insufficient. Even a single low-dose exposure to the mutation-causing drug during fetal development could lead to tumor formation later in life when combined with inflammatory signals.
Dr. Li likened mutated cells to “ticking time bombs,” lying dormant until activated by inflammation. The findings may apply broadly to age- and lifestyle-related cancers, opening doors for new prevention strategies.
“Mutated cells are still a lifetime risk factor. They’re ticking time bombs lying latent, ready to be awakened,” said Dr. Li. She stressed the importance of addressing inflammation through lifestyle changes, such as reducing alcohol intake and maintaining a healthy gut microbiome.
The study underscores the need for cancer prevention efforts to focus not only on avoiding mutagens but also on mitigating inflammation. Future research will explore the cellular mechanisms behind tumor promotion, potentially leading to innovative prevention and early intervention methods.
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