How much can herbal medicine improve survival in liver cancer? — Evidence from 127,000 patients

Three-line summary. In a large study analyzing more than 127,000 liver cancer patients in Taiwan, patients who used herbal medicine together with standard treatment had a 35% lower risk of death than those who did not (hazard ratio 0.65). This benefit appeared consistently across every underlying liver disease, including cirrhosis and hepatitis.

Liver cancer is one of the cancers with the poorest prognosis. Its five-year survival rate is only about 12%, and more than 60% of newly diagnosed patients are found when the disease has already advanced. Because there is no good screening test to catch it early, many people miss the window for surgery and instead have to rely on palliative approaches such as embolization (transcatheter arterial chemoembolization, TACE) or chemotherapy.

Facing this bleak situation, patients and their families ask, "Beyond standard treatment, what more can we do?" Today, drawing on a study of 127,000 people, we lay out one answer to that question in plain terms.

How much does herbal medicine help liver cancer patients survive?

A study published in 2015 in the international journal Liver International tackled this question head-on. The researchers followed 127,237 patients newly diagnosed with liver cancer between 2000 and 2009 in Taiwan's National Health Insurance Research Database (NHIRD), tracking them through 2011. At the time, it was the largest cohort study in the world on herbal medicine for liver cancer, and 30,992 of these patients (24.36%) used herbal medicine as part of their treatment.

The results were striking. After adjusting for factors such as age, sex, comorbidities, and type of treatment, patients who added herbal medicine had a 35% lower risk of death than those who did not (hazard ratio 0.65, 95% confidence interval 0.64–0.66). The gap was clear in actual mortality too. Deaths per 1,000 person-years were 201.8 in the herbal-medicine group, far below the 342.2 in the non-user group.

One background detail is worth noting. In this study, the group that added herbal medicine actually had higher rates of distant metastasis, chemotherapy, and radiotherapy. In other words, patients with worse disease were more likely to turn to herbal medicine — so the fact that the survival benefit was even larger suggests the true effect could be greater still.

The benefit held consistently in fatty liver, hepatitis, and cirrhosis

What makes this study especially persuasive is that the benefit of herbal medicine was not limited to a particular group of patients but held consistently across many liver disease backgrounds. Cirrhosis (liver cirrhosis), alcoholic liver injury, non-alcoholic fatty liver, hepatitis B, hepatitis C — whatever chronic liver disease lay underneath, patients who added herbal medicine had a consistently 28–34% lower risk of death.

Given that liver cancer usually arises at the final stage of such chronic liver diseases, this consistency across backgrounds adds considerable weight to the findings. The message of the paper is clear: even in liver cancer, the cancer with the poorest prognosis, herbal medicine meaningfully raised the odds of survival.

Which herbal medicines were used?

The researchers also analyzed which formulas actually improved survival. Among the many formulas, two showed statistically clear effects: Gami-soyo-san (加味逍遙散, 11% lower risk of death, hazard ratio 0.89) and Siho-sogan-tang (柴胡疏肝湯, 14% lower, hazard ratio 0.86).

What is intriguing is that both formulas belong to the so-gan (疏肝) family — that is, formulas that "unblock and free up stagnant liver energy so it flows freely." Soothing the liver's energy means, in modern terms, resolving the disease mechanisms that arise from acute and chronic stress. The fact that formulas which address emotional stress showed a survival benefit in liver cancer is telling.

How did herbal medicine help survival?

Modern pharmacology also supports these long-standing uses. Gami-soyo-san has been reported in animal studies to have a liver-protective effect that suppresses liver fibrosis, and saikosaponin-d, a key component of Siho-sogan-tang, has been shown to suppress inflammatory signaling and enhance anti-cancer effects. More broadly, herbal medicine is understood to work by boosting the activity of the body's immune cells — T cells and natural killer cells (NK cells) — to suppress cancer cells, and by easing the burden on a body worn down by chemotherapy and radiotherapy.

The Sandol Korean Medicine Clinic website has only just launched and we have just begun posting columns, but as readers who have followed the many articles on our long-running Sandol blog know, the conclusions of the countless studies on herbal medicine for cancer — carried out by different researchers across different cancer types and topics — always converge on one point. Regardless of the cancer type, when herbal medicine is added, the findings consistently point in the same direction: lower mortality, higher survival, fewer side effects from standard treatment, and improved quality of life. Today's liver cancer study sits squarely within that trend.

Herbal medicine alongside standard treatment

The paper introduced today shows the benefit of adding herbal treatment to standard treatment. It is a model in which standard treatments such as surgery, embolization, and chemotherapy continue as-is, while herbal medicine plays a supporting role.

Epilogue

The large-scale data on 127,000 people clearly show that herbal medicine meaningfully drives improved survival.

If you have been diagnosed with liver cancer or are managing chronic liver disease, we encourage you to keep faithfully following your standard treatment while discussing thoroughly with a specialist Korean-medicine doctor whether a suitable herbal medicine could help you. The key is not a one-size-fits-all prescription, but one tailored to your own liver disease background, treatment stage, and physical condition.