Cited by 253Pregnancy and preeclampsia studiesGestational Diabetes Research and ManagementMetabolism, Diabetes, and Cancer

The DOI matches its Crossref record; 293 of the 293 references it cites were found in a registry or an index; 3 of the 221 sources its claims cite were checked for support.

Metformin, the aspirin of the 21st century: its role in gestational diabetes mellitus, prevention of preeclampsia and cancer, and the promotion of longevity

Open access
Romero, Roberto, Erez, Offer, Hüttemann, Maik, Maymon, Eli, Panaitescu, Bogdan, Conde-Agudelo, Agustin, Pacora, Percy, Yoon, Bo Hyun, Grossman, Lawrence I.·2017·American Journal of Obstetrics and Gynecology

Abstract

&NA; Metformin is everywhere. Originally introduced in clinical practice as an antidiabetic agent, its role as a therapeutic agent is expanding to include treatment of prediabetes mellitus, gestational diabetes mellitus, and polycystic ovarian disease; more recently, experimental studies and observations in randomized clinical trials suggest that metformin could have a place in the treatment or prevention of preeclampsia. This article provides a brief overview of the history of metformin in the treatment of diabetes mellitus and reviews the results of metaanalyses of metformin in gestational diabetes mellitus as well as the treatment of obese, non‐diabetic, pregnant women to prevent macrosomia. We highlight the results of a randomized clinical trial in which metformin administration in early pregnancy did not reduce the frequency of large‐for‐gestational‐age infants (the primary endpoint) but did decrease the frequency of preeclampsia (a secondary endpoint). The mechanisms by which metformin may prevent preeclampsia include a reduction in the production of antiangiogenic factors (soluble vascular endothelial growth factor receptor‐1 and soluble endoglin) and the improvement of endothelial dysfunction, probably through an effect on the mitochondria. Another potential mechanism whereby metformin may play a role in the prevention of preeclampsia is its ability to modify cellular homeostasis and energy disposition, mediated by rapamycin, a mechanistic target. Metformin has a molecular weight of 129 Daltons and therefore readily crosses the placenta. There is considerable evidence to suggest that this agent is safe during pregnancy. New literature on the role of metformin as a chemotherapeutic adjuvant in the prevention of cancer and in prolonging life and protecting against aging is reviewed briefly. Herein, we discuss the mechanisms of action and potential benefits of metformin.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

Metformin is a pleiotropic drug whose roles are expanding beyond diabetes to gestational diabetes, possible preeclampsia prevention, cancer risk reduction, and longevity. This narrative review summarizes historical, meta-analytic, randomized-trial, and mechanistic evidence, emphasizing mitochondrial and mTOR/nutrient-sensing pathways.

Key findings

  • In gestational diabetes meta-analyses, metformin was superior to insulin for reducing maternal weight gain and gestational hypertension; Gui et al. found no change in large-for-gestational-age (LGA), small-for-gestational-age (SGA), hypoglycemia, or preeclampsia, while Butalia et al. reported significantly decreased neonatal hypoglycemia, LGA neonates, and neonatal intensive care unit admissions.
  • Two UK randomized trials in obese non-diabetic pregnant women conflicted: EMPOWaR (BMI >30 kg/m²; metformin 500 mg titrated to a maximum tolerable dose ≤2,500 mg) had no significant effect on birth weight, maternal weight gain, preeclampsia, or combined adverse pregnancy outcomes; the Fetal Medicine Foundation trial (BMI >35 kg/m²; 1 g/day increased by 0.5 g/week to 3 g/day) did not reduce LGA but significantly reduced preeclampsia and maternal weight gain, though not gestational diabetes. The review attributes the discrepancy to differences in BMI, dose, compliance, and recruitment: 13% (443/3329) consented in EMPOWaR versus 47% (400/844) in the Fetal Medicine Foundation trial, and compliance was 67% versus almost 80% taking at least 50% of prescribed tablets.
  • Proposed preeclampsia mechanisms include reduced production of anti-angiogenic factors sFlt-1/sVEGFR-1 and soluble endoglin, improved endothelial dysfunction, and effects on the mitochondrial electron transport chain, particularly complex I; metformin also modifies cellular nutrient sensing via AMPK and mTOR. Metformin has a molecular weight of 129 Da, crosses the placenta with a reported lag time of 1.7±0.28 minutes, and meta-analyses found no increased risk of congenital malformations.
  • In cancer and aging, a meta-analysis reported that metformin-treated diabetic patients had a 31% reduction in cancer incidence and a 34% reduction in cancer mortality after adjusting for body mass index; metformin extended longevity in worms and mice but not Drosophila. The TAME trial is planned to test metformin in 3,000 subjects aged 65–79 years with a composite endpoint of cardiovascular events, cancer, dementia, and mortality.

Methods

  • Narrative review, not a systematic review or meta-analysis; no primary data collection or new experimental study is reported.
  • Synthesizes published literature on metformin history, gestational diabetes meta-analyses, randomized trials in obese non-diabetic pregnant women (EMPOWaR and the Fetal Medicine Foundation trial), mechanistic studies of preeclampsia, and evidence on cancer and aging.
  • Main analysis is qualitative synthesis and mechanistic interpretation, drawing on meta-analyses, randomized trials, animal studies, and in vitro/ex vivo placental and vascular studies.

Limitations

  • The paper does not state a formal limitations section.
  • Evident from the text: it is a narrative review with selective citation rather than a systematic search or quantitative pooling, so it may not comprehensively capture all relevant evidence.
  • Evident from the text: many mechanistic and causal claims are inferential, based on secondary literature, animal models, and in vitro findings, and the review does not independently verify the cited results.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1016/j.ajog.2017.06.003

Cites

293 of 293 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

127 Not checked yet · 14 Own interpretation · 4 No basis given · 2 Partly supported · 2 Own result · 1 Supported · accuracy not yet measured

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Show all 109 claims

  • It may state two separate claims as one. 31
  • Probably not a substantial claim. 12
41 of 41
  • The paper relies on this without support.

    Findings on metformin's lifespan extension in worms and mice are applicable to humans.

    “Metformin, long known to be an herbal medicine, has evolved from its use as a popular treatment for diabetes into a drug with a significantly wider array of beneficial effects ranging from cancer treatment to extending longevity, as well as, in our field, gestational hypertension and preeclampsia in obese women.”
1 of 1

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2 of 2

Citations

Cites

Research works printed but not linked: 5

  1. Simonnet, 1927, [Sur les propietes hypoglycemiantes du sulfate de galegine.], Bull Soc Chim Biol Paris, 8
  2. Paulesco, 1921, [Recherches sur le role du pancreas dans l’assimilation nutritive.], Arch Int Physiol, 17, 85
  3. Jackson, 1979, Side-effects of metformin, S Afr Med J, 56, 1113
  4. Myatt, 2000, Oxidative stress causes vascular dysfunction in the placenta, J Matern Fetal Med, 9, 79
  5. Charles, 2004, Metformin crosses the placenta: a modulator for fetal insulin resistance?, Br Med J, 327, 880

Cited by

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Metadata

Authors
Romero, R., Erez, O., Hüttemann, M., Maymon, E., Panaitescu, B., Conde-Agudelo, A., Pacora, P., Yoon, B. H., & Grossman, L. I.
Affiliations
  • United States Department of Health and Human Services (US)
  • Ben-Gurion University of the Negev (IL)
  • Wayne State University (US)
  • Seoul National University (KR)
Corresponding author
  • Romero, Roberto
  • Erez, Offer
Venue
American Journal of Obstetrics and Gynecology
Publisher
Elsevier BV
Published
2017-09
Volume
217
Issue
3
Pages
282-302
ISSN
0002-9378 (ISSN-L)
OpenAlex
W2625297718
Cited by
253
References
293
Citations by year
2026: 10 · 2025: 16 · 2024: 24 · 2023: 25 · 2022: 34 · 2021: 38 · 2020: 29 · 2019: 30 · 2018: 39 · 2017: 8
FWCI
4.93
Type
journal article
Language
en
Open access
Locations
  • American Journal of Obstetrics and Gynecology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (HHSN275201300006C, ZIAHD002400)
Topics
  • Health Sciences › Medicine › Obstetrics and Gynecology › Pregnancy and preeclampsia studies
  • Health Sciences › Medicine › Obstetrics and Gynecology › Gestational Diabetes Research and Management
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
metformin, gestational diabetes mellitus, preeclampsia prevention, prediabetes, polycystic ovary syndrome, macrosomia, large for gestational age, anti-angiogenic factors, soluble fms-like tyrosine kinase-1, soluble endoglin, endothelial dysfunction, mitochondrial function, rapamycin, energy homeostasis, placental transfer, drug safety in pregnancy, chemoprevention, longevity, aging
MeSH terms
Female, Humans, Hypoglycemic Agents, Longevity, Maternal-Fetal Exchange, Metformin, Neoplasms, Pre-Eclampsia, Pregnancy, Randomized Controlled Trials as Topic, Diabetes, Gestational, Maternal Nutritional Physiological Phenomena, Fetal Development, TOR Serine-Threonine Kinases

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