Nikhil Prasad Fact checked by:Thailand Medical News Team Jun 28, 2026 1 hour, 8 minutes ago
Medical News: For decades, scientists have known that viruses can help unlock some of the biggest mysteries surrounding cancer. Now, a new review highlights how research on viruses that infect chickens laid the foundation for many of today's most important cancer discoveries, ultimately leading to life-saving targeted cancer therapies and opening new directions for future research. The review was conducted by Dr. Peter K. Vogt from the Department of Molecular and Cellular Biology, The Scripps Research Institute, La Jolla, California, USA.
Historic virus research uncovered the cancer genes that now power many of today's precision cancer therapies
Tiny Viruses That Changed the Course of Cancer Research
More than a century ago, researchers discovered that a virus called the Rous sarcoma virus could trigger tumors in chickens. That breakthrough marked the beginning of modern tumor virology and eventually helped scientists recognize that cancer is fundamentally a genetic disease.
Over the following decades, researchers developed laboratory techniques that allowed them to grow infected chicken cells in culture instead of relying solely on animal experiments. One major advance was the "focus assay," which enabled scientists to directly observe cancer-like transformation in cells. This simple but powerful technique became one of the cornerstones of early retrovirus research and greatly accelerated the understanding of cancer-causing genes.
How Chicken Viruses Revealed Cancer Genes
One of the most remarkable discoveries described in the review is that certain avian retroviruses carried special genes capable of driving uncontrolled cell growth. Researchers eventually identified the first viral cancer gene, known as src, after noticing that viruses capable of causing tumors possessed extra genetic material absent from harmless viral variants.
Further investigation revealed an even more surprising fact. The src gene did not actually originate in viruses. Instead, it had been captured from normal cells, proving that cancer-causing genes already exist naturally within healthy organisms. Under the wrong circumstances, these normal genes can become dangerous.
Scientists later discovered many additional oncogenes, including MYC, RAF, RAS, ABL, JUN, PI3K, ERBB, and several others. Many of these genes remain among the most important cancer drivers identified in human cancers today.
Building the Foundation for Modern Cancer Treatments
The discoveries made using avian retroviruses eventually transformed clinical medicine. For example, research involving the viral erbB oncogene helped reveal the importance of the human HER2 gene. HER2 later became the target of one of the world's best-known targeted cancer therapies for breast cancer.
Similarly, studies involving the ABL oncogene eventually led scientists to understand the BCR-ABL fusion protein responsible for chronic myeloid leukemia. That knowledge paved the way for precision drugs capable of dramatically improving patient survival.
Research on RAS, MYC, PI3K, and BRAF has also driven the
development of numerous targeted therapies and continues to influence new drug discovery efforts.
This
Medical News report highlights how these discoveries did not occur in isolation. Instead, decades of careful research using relatively simple viruses gradually uncovered the molecular machinery that fuels many human cancers.
Future Cancer Research May Go Beyond Genes Alone
The review also emphasizes that cancer research is entering another major transition. Modern sequencing technologies, single-cell analysis, advanced proteomics, and improved RNA studies are allowing scientists to examine tumors in unprecedented detail.
The author argues that future breakthroughs may come from understanding how large networks of genes interact rather than focusing only on individual cancer genes. Even more importantly, growing evidence suggests that regulatory RNAs—including long non-coding RNAs and microRNAs—may play much larger roles in controlling cancer development than previously appreciated.
Rather than viewing cancer simply as a collection of mutated genes, researchers increasingly believe it should be understood as a highly complex disruption of entire cellular regulatory systems.
Conclusion
This comprehensive review demonstrates that many of today's most successful cancer treatments owe their origins to decades of research involving avian retroviruses. Discoveries of key oncogenes such as src, MYC, HER2, RAS, RAF, ABL, and PI3K fundamentally reshaped modern oncology and continue to guide targeted therapies. Looking ahead, advances in sequencing technologies, proteomics, and RNA biology are expected to reveal even deeper mechanisms controlling cancer development. The next generation of breakthroughs may arise from understanding complex gene regulation networks rather than focusing solely on individual mutations, potentially opening entirely new strategies for cancer diagnosis, prevention, and treatment.
The review was published in the peer reviewed journal: Viruses.
https://www.mdpi.com/1999-4915/18/7/702
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