# Pragmatic trial

Source: https://onco.cc/terms/pragmatic-trial/  
OnCo record `pragmatic-trial` (Term). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

A pragmatic trial tests a treatment the way it would actually be used: ordinary patients, ordinary clinics, usual care as the comparison and an outcome that matters to patients, so the answer applies in the real world and not only in the trial.

## Summary

Trials sit on a spectrum. An explanatory trial asks whether a treatment can work under ideal conditions: narrow eligibility, specialist centres, tightly controlled dosing, a placebo comparator, frequent scans. A pragmatic trial asks whether it does work in practice: broad eligibility including the older and sicker patients who make up most of the clinic, usual care as the comparator, delivery by the usual staff, follow-up through routine records, and an outcome such as survival or hospital admission rather than a scan-defined surrogate. The PRECIS-2 wheel scores a design on nine such dimensions. Pragmatic trials tend to be large, cheap per patient and publicly funded, because the interventions they test (a generic drug, an exercise programme, a screening schedule, a shorter course) rarely have a commercial sponsor.

The corpus examples are mostly academic. CHALLENGE randomised 889 colon cancer patients after chemotherapy to a coached exercise programme or health-education materials, delivered by physical activity consultants across five countries over three years, and found better disease-free and overall survival; it tested a service, not a molecule. Add-Aspirin randomises 11,000 patients across four cancers in the United Kingdom, Ireland and India to a generic drug or placebo for five years, with publicly funded infrastructure and broad eligibility; it keeps a placebo, so it is pragmatic in scale and setting rather than in every dimension. BWEL delivered a two-year weight-loss programme to more than 3,000 women by telephone. The Indian cluster-randomised screening trials in Kerala, Mumbai and Osmanabad, run through primary health workers in the communities they served, are pragmatic trials at population scale.

The trade-off is precision for relevance. Usual care varies between sites and drifts over a long trial, adherence is lower than in a tightly run trial, and outcomes drawn from routine records are less complete than trial-collected ones, all of which pull the result towards no difference. A pragmatic trial that shows a benefit is therefore persuasive; one that shows none may have diluted a real effect. Pragmatic and explanatory answers are both needed, in that order for a new drug and often in the reverse order for a change in how care is organised.

## Fields

- Kind: Term
- Last checked: 2026-09-17
- Also known as: pragmatic trial; pragmatic trials; pragmatic design; pragmatic randomised trial; pragmatic randomized trial; large simple trial; large simple trials; explanatory trial; explanatory versus pragmatic; PRECIS-2; usual care comparator; usual care; real-world trial; point-of-care trial; point-of-care randomisation; embedded trial; broad eligibility; broad eligibility criteria; generalisability; generalizability; external validity

## Sources

- Wikipedia: https://en.wikipedia.org/wiki/Pragmatic_clinical_trial
- Wikipedia: https://en.wikipedia.org/wiki/Pragmatic_clinical_trial
- CONSORT statement: reporting randomised trials: https://www.consort-statement.org/

## Connected records

- terms: [Accrual and enrolment](https://onco.cc/terms/accrual/), [Cluster-randomised trial](https://onco.cc/terms/cluster-randomised-trial/), [Control arm and comparator (investigator's choice)](https://onco.cc/terms/control-arm/), [Decentralised trial](https://onco.cc/terms/decentralised-trial/), [N-of-1 trial](https://onco.cc/terms/n-of-1-trial/), [Phase 1, 2 and 3 trials](https://onco.cc/terms/trial-phases/), [Randomised trial](https://onco.cc/terms/randomised-trial/), [Real-world evidence](https://onco.cc/terms/real-world-evidence/), [Registry-based randomised trial](https://onco.cc/terms/registry-based-trial/), [Seamless, adaptive and Bayesian trial designs](https://onco.cc/terms/seamless-adaptive/), [Standard of care](https://onco.cc/terms/standard-of-care/), [Stepped-wedge design](https://onco.cc/terms/stepped-wedge-design/), [Why trials fail: underpowered, wrong endpoint, control arm drift, subgroup fishing, crossover](https://onco.cc/terms/trial-failure-modes/)
- fronts: [Drug Discovery Platforms](https://onco.cc/fronts/drug-discovery/)
- trials: [Add-Aspirin](https://onco.cc/trials/add-aspirin/), [BWEL (Breast Cancer Weight Loss, Alliance A011401)](https://onco.cc/trials/bwel/), [CHALLENGE (CCTG CO.21)](https://onco.cc/trials/challenge/), [Kerala oral cancer visual screening trial (Trivandrum)](https://onco.cc/trials/kerala-oral-screening/)
- bottlenecks: [Trials do not represent the people who get cancer](https://onco.cc/bottlenecks/b-trial-diversity/), [Trials enrol too few, too slowly](https://onco.cc/bottlenecks/b-trial-enrolment/), [Weak real-world evidence and registries](https://onco.cc/bottlenecks/b-real-world-evidence/)

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