# Two-page plain-language consent with teach-back for every cancer trial and treatment

Source: https://onco.cc/ideas/idea-moon-plain-language-consent/  
OnCo record `idea-moon-plain-language-consent` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Replace 30-page consent forms with a short plain summary the patient explains back in their own words before signing, so consent means understanding.

## Summary

Trial consent documents run to tens of pages at university reading level; comprehension studies show many participants cannot state the purpose of the study or that treatment is experimental. The proposal is a regulatory requirement that every consent process include a two-page plain-language summary (reading age 12, translated, with pictograms for risk) followed by a documented teach-back, with the long form as an appendix. The EU Clinical Trials Regulation already requires lay summaries of results; this extends the principle upstream.

## Fields

- Kind: Idea
- Last checked: 2026-09-08
- Hypothesis: Short-form consent with teach-back raises objective comprehension scores (e.g., QuIC) by 20 points or more without reducing enrolment, and reduces later withdrawal for misunderstanding.
- Rationale: Comprehension is a product of format, not patient intelligence. Teach-back is standard in patient safety, and shorter consent has performed as well or better than long forms in randomised comparisons of consent formats.
- Proposed test: Randomised comparison of standard versus short-form-plus-teach-back consent across ten trials; primary endpoint comprehension score at 24 hours, secondary endpoints enrolment, withdrawal and time to consent.
- Maturity: early-clinical
- Actor: regulator

## Sources

- Bottleneck evidence (Patients lack understanding, navigation and agency): Basch et al., Overall survival results of a trial assessing patient-reported outcomes for symptom monitoring during routine cancer treatment (JAMA 2017): https://doi.org/10.1001/jama.2017.7156

## Connected records

- bottlenecks: [Patients lack understanding, navigation and agency](https://onco.cc/bottlenecks/b-patient-voice/), [Trials enrol too few, too slowly](https://onco.cc/bottlenecks/b-trial-enrolment/)

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