Evidence map›Paper›PMID 27548217›Full record

ReviewNutrients2016

Evidence to Support the Anti-Cancer Effect of Olive Leaf Extract and Future Directions.

Anna Boss, Karen S Bishop, Gareth Marlow, Matthew P G Barnett, Lynnette R Ferguson

Open access · goldAbstract readReview
In one paragraph

Review in Nutrients, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 67 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
67citing papers in PubMed, 2 pooled it
13.1field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

67 citing papers in PubMed, 2 syntheses or guidelines pooled it, 189 citations in OpenAlex.

  1. Medicinal plants used for the treatment of mucositis induced by oncotherapy: a systematic review.Supportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer · 2021
    Pooled it
  2. Pooled it
  3. Trial
  4. Trial
  5. Article
  6. Review
  7. Article
  8. Superior efficacy of 2%Open veterinary journal · 2026
    Article
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Review
  15. In Vitro Evaluation of Olive Leaf (Pharmaceuticals (Basel, Switzerland) · 2025
    Article
  16. Article
  17. Article
  18. In-Depth Analysis ofBiology · 2024
    Article
  19. Article
  20. Review

7 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 2 institutions in 1 country.

Anna BossDiscipline of Nutrition, FM & HS, University of Auckland Medical School, Private Bag 92019, Auckland 1142, New Zealand. abos517@aucklanduni.ac.nz.
Karen S BishopAuckland Cancer Society Research Centre, FM & HS, University of Auckland Medical School, Private Bag 92019, Auckland 1142, New Zealand. k.bishop@auckland.ac.nz.
Gareth MarlowDiscipline of Nutrition, FM & HS, University of Auckland Medical School, Private Bag 92019, Auckland 1142, New Zealand. MarlowG@cardiff.ac.uk.
Matthew P G BarnettFood Nutrition & Health Team, Food & Bio-based Products Group, AgResearch Limited, Grasslands Research Centre, Tennent Drive, Palmerston North 4442, New Zealand. matthew.barnett@agresearch.co.nz.
Lynnette R FergusonDiscipline of Nutrition, FM & HS, University of Auckland Medical School, Private Bag 92019, Auckland 1142, New Zealand. l.ferguson@auckland.ac.nz.
University of Auckland · NZAgResearch · NZ

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The traditional Mediterranean diet (MD) is associated with long life and lower prevalence of cardiovascular disease and cancers. The main components of this diet include high intake of fruit, vegetables, red wine, extra virgin olive oil (EVOO) and fish, low intake of dairy and red meat. Olive oil has gained support as a key effector of health benefits and there is evidence that this relates to the polyphenol content. Olive leaf extract (OLE) contains a higher quantity and variety of polyphenols than those found in EVOO. There are also important structural differences between polyphenols from olive leaf and those from olive fruit that may improve the capacity of OLE to enhance health outcomes. Olive polyphenols have been claimed to play an important protective role in cancer and other inflammation-related diseases. Both inflammatory and cancer cell models have shown that olive leaf polyphenols are anti-inflammatory and protect against DNA damage initiated by free radicals. The various bioactive properties of olive leaf polyphenols are a plausible explanation for the inhibition of progression and development of cancers. The pathways and signaling cascades manipulated include the NF-κB inflammatory response and the oxidative stress response, but the effects of these bioactive components may also result from their action as a phytoestrogen. Due to the similar structure of the olive polyphenols to oestrogens, these have been hypothesized to interact with oestrogen receptors, thereby reducing the prevalence and progression of hormone related cancers. Evidence for the protective effect of olive polyphenols for cancer in humans remains anecdotal and clinical trials are required to substantiate these claims idea. This review aims to amalgamate the current literature regarding bioavailability and mechanisms involved in the potential anti-cancer action of olive leaf polyphenols.

Indexed as

AnimalsAntineoplastic Agents, PhytogenicHumansNeoplasmsOleaPlant ExtractsPlant LeavesPolyphenolsAntineoplastic Agents, PhytogenicPlant ExtractsPolyphenolsCyclooxygenase-2inflammationMediterranean dietoleuropeinolive leafoxidative stress

Identifiers

PMID27548217
PMCPMC4997426
OpenAlexW2516968175

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.