Cancer is often thought of as something that can only be treated after it develops. But researchers are increasingly focusing on another goal: preventing cancer before it starts. This field is known as cancer chemoprevention, which means using medicines, vaccines, natural compounds, or healthy lifestyle strategies to lower the risk of cancer developing or returning.
A large new review looked at decades of research into cancer prevention. It highlights how today’s prevention strategies already save lives while also exploring promising new approaches, including natural plant compounds, personalized vaccines, and precision medicine. Although many of these newer approaches are still being studied, they offer hope that cancer prevention could become much more personalized in the future.
What Is Cancer Chemoprevention?
Cancer chemoprevention means using treatments or substances that can help stop cancer from forming, slow its development, or reduce the chance that it comes back after treatment.
Researchers describe three main types of prevention:
- Primary prevention: Preventing cancer before it starts by reducing risk factors.
- Secondary prevention: Treating precancerous changes before they become cancer.
- Tertiary prevention: Lowering the chance that cancer returns after treatment.
This approach works alongside healthy lifestyle habits such as not smoking, maintaining a healthy weight, exercising regularly, and staying up to date with recommended cancer screenings.
Some Cancer Prevention Treatments Already Work
While many people don’t realize it, several cancer prevention treatments are already available today.
Examples include:
- HPV vaccines that help prevent cervical and several other HPV-related cancers.
- Hepatitis B vaccines that lower the risk of liver cancer.
- Tamoxifen and raloxifen which work as an estrogen receptor (ER) modulator (SERM) for certain women at high risk of breast cancer.
- Medicines used to treat precancerous skin changes before skin cancer develops.
These treatments show that preventing cancer is already possible in some situations, although researchers want to expand these options much further.
Natural Compounds Are a Major Area of Research
One of the biggest focuses of current research is finding natural compounds that may help reduce cancer risk.
Scientists are studying substances found naturally in foods and plants because many appear to affect the same biological pathways involved in cancer development while generally causing fewer side effects than traditional medications.
Some of the most studied compounds include:
- Green tea compounds (EGCG)
- Curcumin from turmeric
- Resveratrol from grapes
- Quercetin found in apples and onions
- Soy compounds such as genistein
- Berberine
- Piperine from black pepper
- Apigenin found in parsley and chamomile
Laboratory studies suggest these compounds may:
- Reduce chronic inflammation
- Protect cells from DNA damage
- Slow abnormal cell growth
- Encourage damaged cells to die before becoming cancer
- Support a healthier immune response
Although many of these findings are encouraging, most still need larger human clinical trials before they can become standard cancer prevention treatments.
The Immune System May Be One of the Best Ways to Prevent Cancer
Researchers are also developing new ways to help the immune system recognize and stop cancer much earlier.
Beyond vaccines that prevent viruses linked to cancer, scientists are testing personalized cancer vaccines designed specifically for an individual’s tumor. These vaccines train immune cells to recognize unique proteins found only on cancer cells.
Early clinical trials suggest these personalized vaccines may help reduce the risk of cancer returning after treatment in some patients, although they are still experimental. Researchers are also studying immune-based therapies that could one day be used before cancer develops in people at very high risk.
Precision Medicine Could Change Cancer Prevention
Researchers believe the future of cancer prevention will become much more personalized.
Instead of giving everyone the same prevention plan, doctors may one day use genetic testing, biomarkers, artificial intelligence, and advanced imaging to identify people who have the highest risk of developing certain cancers.
That could allow prevention strategies to be tailored to each person’s individual biology, making treatments more effective while avoiding unnecessary medications for people at lower risk. The review also highlights the growing role of technologies such as organoids, genomic testing, and multi-omics research in helping make this possible.
What This Means for You
Cancer prevention is changing rapidly. While healthy habits like avoiding tobacco, eating a balanced diet, staying active, maintaining a healthy weight, limiting alcohol, protecting your skin from excessive sun exposure, and keeping up with recommended cancer screenings remain the foundation of prevention, researchers are working toward even more powerful tools.
Natural compounds, improved vaccines, personalized immunotherapy, and precision medicine are opening new possibilities that could help prevent cancer before it begins. Although many of these approaches are still being studied, they represent an exciting step toward a future where preventing cancer becomes just as important as treating it.
Source
Ren J, Yan G, Yang L, Kong L, Guan Y, Sun H, et al. Cancer chemoprevention: signaling pathways and strategic approaches. Signal Transduct Target Ther. 2025;10:113. doi:10.1038/s41392-025-02167-1.
Accessed by: https://www.nature.com/articles/s41392-025-02167-1.pdf
