Evidence map›Paper›PMID 28114746›Full record

ArticleStatistics in medicine2017

A framework for the investigation of pleiotropy in two-sample summary data Mendelian randomization.

Jack Bowden, Fabiola Del Greco M, Cosetta Minelli, George Davey Smith, Nuala Sheehan, John Thompson

Abstract read
In one paragraph

Article in Statistics in medicine, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1,119 papers, 10 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
1,119citing papers in PubMed, 10 pooled it
–field-weighted citation impact
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

1,119 citing papers in PubMed, 10 syntheses or guidelines pooled it.

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  4. Use of Mendelian Randomization to Unveil Metabolic Markers inJournal of Korean medical science · 2026
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  15. How gut microbiome and blood metabolites drive ossification of the posterior longitudinal ligament of the spine: a genome-wide association study based on the East Asian population.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2026
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1,059 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

6 authors.

Jack BowdenMRC Integrative Epidemiology Unit, University of Bristol, U.K.
Fabiola Del Greco MCenter for Biomedicine, EURAC research, Bolzano, Italy.
Cosetta MinelliPopulation Health and Occupational Disease, NHLI, Imperial College, London, U.K.
George Davey SmithMRC Integrative Epidemiology Unit, University of Bristol, U.K.
Nuala SheehanDepartment of Health Sciences, University of Leicester, Leicester, U.K.
John ThompsonDepartment of Health Sciences, University of Leicester, Leicester, U.K.

Funding

Medical Research Council MC_EX_MR/L012286/1Medical Research Council MCUU12013/1Medical Research Council MR/N501906/1
6 · The paper itself

Abstract

Mendelian randomization (MR) uses genetic data to probe questions of causality in epidemiological research, by invoking the Instrumental Variable (IV) assumptions. In recent years, it has become commonplace to attempt MR analyses by synthesising summary data estimates of genetic association gleaned from large and independent study populations. This is referred to as two-sample summary data MR. Unfortunately, due to the sheer number of variants that can be easily included into summary data MR analyses, it is increasingly likely that some do not meet the IV assumptions due to pleiotropy. There is a pressing need to develop methods that can both detect and correct for pleiotropy, in order to preserve the validity of the MR approach in this context. In this paper, we aim to clarify how established methods of meta-regression and random effects modelling from mainstream meta-analysis are being adapted to perform this task. Specifically, we focus on two contrastin g approaches: the Inverse Variance Weighted (IVW) method which assumes in its simplest form that all genetic variants are valid IVs, and the method of MR-Egger regression that allows all variants to violate the IV assumptions, albeit in a specific way. We investigate the ability of two popular random effects models to provide robustness to pleiotropy under the IVW approach, and propose statistics to quantify the relative goodness-of-fit of the IVW approach over MR-Egger regression. © 2017 The Authors. Statistics in Medicine Published by JohnWiley & Sons Ltd.

Indexed as

Genetic PleiotropyMendelian Randomization AnalysisData Interpretation, StatisticalHumansMeta-Analysis as TopicModels, Statisticalinstrumental variablesMendelian randomizationmeta-analysisMR-Egger regressionpleiotropy

Identifiers

PMID28114746
PMCPMC5434863

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Registered trials

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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.