Thailand Medical Scientists Discover Herb That Inhibits Cancer Cell Proliferation and Shrinks Lung Tumors
Nikhil Prasad Fact checked by:Thailand Medical News Team May 26, 2026 52 minutes ago
Thailand Medical: A team of Thai researchers has discovered that a traditional medicinal herb used in Thailand may hold powerful cancer-fighting abilities after experiments showed it could dramatically shrink lung tumors and trigger the destruction of cancer cells. The findings are generating excitement because the plant appears to attack cancer through multiple biological pathways at the same time, something many current treatments struggle to achieve.
Thai medical researchers discover a traditional medicinal herb extract capable of shrinking lung tumors and
triggering cancer cell death in laboratory and animal studies
The study was conducted by
Thailand Medical scientists from the Faculty of Pharmaceutical Sciences at Khon Kaen University, the Faculty of Pharmaceutical Sciences and the College of Medicine and Public Health at Ubon Ratchathani University in Thailand, along with support from the Institute of Natural Medicine at the University of Toyama in Japan.
The researchers focused on Clausena harmandiana, a medicinal plant traditionally used in Thai herbal medicine for inflammatory and gastrointestinal conditions. Scientists investigated extracts taken from the plant’s roots and identified a particularly powerful active compound known as 7-methoxyheptaphylline. Laboratory tests revealed that the extract strongly reduced the survival of lung cancer cells along with liver and colorectal cancer cells.
Root Extract Was Far More Powerful Than Leaves
The researchers compared extracts from different parts of the plant and found that the roots produced the strongest anticancer effects. Chemical analysis showed that the roots contained high levels of biologically active compounds including carbazole alkaloids and coumarins, substances already known to possess potential anticancer properties.
In some laboratory experiments, the root extract destroyed large numbers of cancer cells within 24 hours. Lung cancer cells treated with the extract showed severe reductions in viability, especially when exposed to higher doses over longer periods. Scientists said the effects were both concentration-dependent and time-dependent, meaning the treatment became more effective as dosage and exposure time increased.
Scientists Observed Cancer Cells Self-Destructing
One of the most important findings was the way the extract forced cancer cells into apoptosis, a natural self-destruction process used by the body to eliminate dangerous or damaged cells. Cancer cells often survive by blocking apoptosis, allowing tumors to continue growing uncontrollably.
The study found that the Thai herb activated a protein known as cleaved caspase-3, which plays a critical role in programmed cell death. At the same time, the extract sharply reduced several proteins that normally protect cancer cells from dying, including Bcl-2, Bcl-xL, and Mcl-1.
Researchers also observed activation of JNK signaling, a cellular stress pathway known to promote the destruction of damaged
cells. Together, these changes created a highly hostile environment for cancer cells, leading to mitochondrial dysfunction and eventual tumor cell death.
Key Lung Cancer Survival Pathway Blocked
The researchers made another major discovery involving STAT3, a signaling pathway heavily linked to lung cancer growth, metastasis, immune evasion, and resistance to chemotherapy. Persistent activation of STAT3 is considered one of the major reasons why many lung cancers become aggressive and difficult to treat.
The active compound 7-methoxyheptaphylline significantly suppressed STAT3 activation in lung cancer cells. In fact, the suppression was comparable to a specialized laboratory STAT3 inhibitor used in cancer research.
This Medical News report notes that STAT3 has become one of the most closely watched targets in modern cancer therapy because it controls numerous genes that help tumors survive and spread. By shutting down STAT3 while simultaneously activating cancer cell suicide pathways, the herbal compound demonstrated a powerful dual-action effect against cancer cells.
Mouse Studies Revealed Dramatic Tumor Shrinkage
To determine whether the extract could work in living organisms, scientists implanted mice with aggressive lung tumors and treated them with oral capsules containing Clausena harmandiana extract. The results were striking. Mice receiving the herbal treatment developed significantly smaller tumors compared to untreated animals.
Advanced imaging scans also showed much weaker tumor signals in treated mice, indicating a substantially lower tumor burden. By the seventh and tenth days of treatment, tumor growth in treated animals had slowed dramatically compared to controls.
Researchers said the animal findings strongly supported the laboratory data showing suppression of STAT3 signaling and activation of apoptosis pathways.
Conclusion
The findings from this study suggest that Clausena harmandiana could become an important source of future anticancer therapies, particularly for lung cancer. What makes the discovery especially significant is that the plant extract does not attack cancer through a single mechanism. Instead, it simultaneously disrupts cancer survival pathways, blocks STAT3 signaling, activates cellular stress responses, and forces tumor cells into self-destruction. The strong tumor suppression seen in mice, together with the powerful laboratory findings, provides growing evidence that compounds from this traditional Thai medicinal plant may eventually contribute to safer and more effective cancer treatments. However, researchers caution that human clinical studies are still needed before the herb can be considered for medical use in cancer patients.
The study findings were published in the peer reviewed International Journal of Molecular Sciences.
https://www.mdpi.com/1422-0067/27/11/4743
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Read Also:
https://www.thailandmedical.news/articles/thailand-medical
https://www.thailandmedical.news/articles/cancer
https://www.thailandmedical.news/articles/herbs-and-phytochemicals
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