Laboratory / cell studyindependent cross-checkabstract checked I-CHM-121 standard review
A fungus that makes taxol
Taxol and taxane production by Taxomyces andreanae, an endophytic fungus of Pacific yew.
Overview
Stierle A et al.. Science 1993 · PMID 8097061 · DOI 10.1126/science.8097061
A fungus living in yew bark produced small amounts of the cancer drug taxol in the lab.
Does the study support the specific claim? Partly · Methodological quality: low
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Find a microbial source of taxol
- How was the study done?
Lab culture
- How many people, animals or samples were studied?
One fungal isolate
- What was actually found?
Fungus produced taxol
- How large was the observed effect?
Not applicable
- What do the results mean in everyday life?
Some drugs have natural links, including fungi
- What are the study's limitations?
Laboratory finding only
- What does it say about Elawady's specific claim?
Only a marginal nuance to the claim
- Do the results apply to Germany and Europe?
Not applicable
- What can explicitly not be concluded from this study?
Says nothing about whether drugs work
Scientific in-depth review
1. Full reference
- Authors
- Stierle A et al.
- Journal
- Science
- Year
- 1993
- Identifier
- PMID 8097061 DOI 10.1126/science.8097061
- Verification
- verified – PubMed efetch 2026-10-26 (PublicationType and CommentsCorrections checked); Crossref 2026-10-26
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
US government and non-US-government support.
2. Research question
Can a fungal endophyte of the Pacific yew produce taxol?
3. Study design and population
- Study design
- Laboratory / cell study – Laboratory microbiology study
- Population
Fungal isolate Taxomyces andreanae
- Country
USA
- Period
Not stated
- Sample size
Not applicable
- Inclusion and exclusion criteria
Not applicable
4. Methods and endpoints
- Exposure / intervention
Fungal culture
- Comparator
Zero-time cultures
- Endpoints
Taxol detection
- Statistical methods
Mass spectrometry, chromatography, antibody reactivity, radiolabel incorporation
5. Actual results
- Results
The fungus produced taxol and related compounds in semi-synthetic medium; labelled acetate and phenylalanine were incorporated into taxol; no taxol in zero-time cultures.
- Absolute risks
not applicable
- Authors' conclusion
A fungal endophyte of Pacific yew produces taxol.
6. Strengths
- Multiple detection methods
7. Weaknesses
- Single fungal isolate, laboratory culture only
- Does not address drug supply or clinical use
8. Risk of bias
- Orienting tool
- none applicable
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- not assessable
- Rationale
Laboratory study.
9. Assessment of the statistical interpretation
Not applicable.
10. Relevance to the specific claim
Partial support for the general idea that some anticancer compounds have microbial or fungal links; does not apply to methotrexate (an antifolate) or cisplatin (an inorganic platinum compound).
11. Independent contrary findings
I-CHM-09 (anthracyclines are from Streptomyces bacteria), I-CHM-10 (platinum compounds).
12. Transferability to Germany and Europe
Not applicable.
13. Overall methodological judgement
Real but marginal nuance.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | not assessable |
| Precision of results | not applicable |
| Directness | indirect |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | mixed |
| Regional transferability | not applicable |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
None.
15. Linked fact checks
- Chemotherapy drugs (e.g., methotrexate, cisplatin) are fungal products, so using them against one's own cells is illogical. – Studies with mixed or unclear results