Mistletoe and Cancer- Evidence of Benefits

Mistletoe and Cancer- Evidence?

Mistletoe and Cancer- Evidence, Benefits, and Risks- Mistletoe extract (Viscum album) is a plant-based therapy used in integrative oncology—especially in Europe—to improve quality of life and reduce treatment side effects.

While laboratory and some clinical studies suggest immune-modulating and anti-tumor effects, there is no strong evidence that mistletoe improves survival, and it is not approved as a cancer treatment in the U.S.

I am a long-term survivor of an incurable cancer called multiple myeloma. I have become somewhat jaded over my 30-plus years surviving a cancer that my oncologist said was incurable.

I believe that conventional FDA-approved cancer therapies can help patients in many cases, but I also believe that many non-conventional therapies help cancer patients, too. PeopleBeatingCancer.org’s mission is to research those therapies that your oncologist probably won’t talk about, such as:

If you have any questions, scroll down the page, post a question or a comment, and I’ll reply to you ASAP.

Good luck,

David Emerson

What Is Mistletoe Extract?

Mistletoe extract—derived from the plant Viscum album—has been used in cancer care for over 100 years, particularly in Germany and Switzerland. It is most often administered by injection as a complementary therapy alongside chemotherapy or radiation.

Key biologically active compounds include:

Lectins (immune-stimulating, cytotoxic)
Viscotoxins (cell-killing proteins)
Polysaccharides and flavonoids (anti-inflammatory, antioxidant)

These compounds have demonstrated anti-cancer effects in laboratory and animal models.

How Mistletoe Extract May Work in Cancer

1. Immune System Modulation

Mistletoe appears to stimulate immune activity, including increased cytokine production and immune cell activation.

2. Direct Anti-Tumor Effects

Laboratory studies show mistletoe can:

Inhibit tumor cell growth
Induce apoptosis (programmed cell death)
Disrupt protein synthesis in cancer cells

3. Anti-Inflammatory and Antioxidant Effects

Chronic inflammation drives cancer progression; mistletoe’s antioxidant properties may help counter this.

Pros of Mistletoe Extract in Cancer Care

1. May Improve Quality of Life

Several studies and reviews report:

Reduced fatigue
Improved appetite and sleep
Better emotional well-being

Some patients experience fewer chemotherapy-related side effects.

👉 This is the strongest and most consistent benefit in the research.

2. Potential Reduction in Treatment Side Effects

Evidence suggests mistletoe may:

Reduce nausea and pain
Improve tolerance to chemotherapy
Decrease treatment-related fatigue

3. Long History of Use in Integrative Oncology

Widely used in Europe (up to 80% of German oncologists incorporate it)
Often prescribed as part of a holistic cancer care plan

4. Biological Anti-Cancer Activity (Preclinical)

In vitro and animal studies show:

Tumor growth inhibition
Anti-angiogenesis (blocking blood supply to tumors)
Immune activation

Cons of Mistletoe Extract in Cancer Care

1. No Proven Survival Benefit

Despite decades of study:

Clinical trials have not reliably shown improved survival
Many studies have methodological weaknesses

👉 This is the biggest limitation.

2. Poor Quality and Inconsistent Research

Many trials are small, unblinded, or biased
Results vary depending on preparation and dosing
Different formulations (Iscador, Helixor, etc.) complicate comparisons

The National Cancer Institute notes that evidence remains inconclusive.

3. Not Approved in the United States

Injectable mistletoe is not FDA-approved
Available mainly through clinical trials or integrative clinics

4. Safety Concerns and Side Effects

Common side effects:

Injection site reactions
Fever, chills, fatigue

Rare but serious risks:

Allergic reactions (including anaphylaxis)
Potential liver toxicity
Possible worsening of autoimmune conditions

5. Not Appropriate for All Patients

Mistletoe may be contraindicated in:

Leukemia patients
Autoimmune disorders
Certain immune-related conditions
Mistletoe and Cancer- Evidence

What the Research Really Says (Bottom Line)

Strongest Evidence:

✅ Improves quality of life
✅ May reduce treatment-related side effects

Weak or Inconclusive Evidence:

⚠️ Tumor shrinkage in humans
⚠️ Immune system translating into clinical benefit

No Evidence:

❌ Improved survival (overall survival or progression-free survival)

Should Cancer Patients Consider Mistletoe?

Mistletoe extract may be worth considering if:

You are:

Undergoing chemotherapy or radiation
Experiencing fatigue or poor quality of life
Working with an integrative oncology team

You should NOT:

Use mistletoe as a replacement for conventional therapy
Self-prescribe without medical supervision

👉 The best use case is adjunctive, symptom-focused care, not tumor control.

Integrative Oncology Perspective (PBC Takeaway)

From a PeopleBeatingCancer perspective:

Mistletoe fits into a broader evidence-based complementary therapy strategy, similar to:

Nutrition and microbiome support
Exercise and metabolic therapies
Repurposed drugs (e.g., metformin, ivermectin)

It is not a cure, but it may help patients:

Feel better
Tolerate treatment
Maintain quality of life

To learn more about managing your cancer:

Pillar / Core Pages

Side Effect Cluster

Therapy Clusters

Evidence Appendix (PubMed & Authoritative Sources)

Mistletoe Extracts (PDQ®)–Patient Version

Overview

Mistletoe is a semiparasitic plant that grows on many types of trees, including apple, oak, pine, and elm (see Question 1).
Mistletoe extracts are one of the most widely studied complementary and alternative medicine therapies in people with cancer. In Europe, mistletoe extracts are among the most prescribed drugs for patients with cancer (see Question 1).
Mistletoe extracts are usually given by injection under the skin or, less often, into a vein, into the pleural cavity, or into a tumor(see Question 2).
Few side effects have been reported from the use of mistletoe extracts (see Question 5).
The U.S. Food and Drug Administration (FDA) has not approved mistletoe extracts as a treatment for cancer or any other medical condition (see Question 6).
Mistletoe and Cancer- Evidence

Diagnosed with Cancer? Your two greatest challenges are understanding cancer and understanding possible side effects from chemo and radiation. Knowledge is Power!