The History and Evolution of Good Clinical Practice
Part of Good Clinical Practice (GCP) — ICH E6(R3): Introduction to Clinical Research and GCP.
About 5 minutes. Free, in your language, no account needed.
Why this matters
Good Clinical Practice (GCP) is not an abstract standard. Almost every rule in it was written after people were harmed. If you know why a rule exists, you apply it correctly under pressure. You also avoid a common site problem: staff trained on an old version who quote requirements that have changed.
The ethical foundations
Modern research ethics grew from a series of public failures and the responses to them.
| Year | Event | What it established |
|---|---|---|
| 1947 | Nuremberg Code | Voluntary consent of the human subject is essential. |
| 1964 | Declaration of Helsinki, adopted by the World Medical Association | Ethical principles for medical research involving human subjects. |
| 1966 | Henry Beecher publishes "Ethics and Clinical Research" | Showed that unethical studies were common in mainstream medicine. |
| 1972 | The Tuskegee syphilis study is publicly exposed and stopped | Forced national reform of human subject protection in the United States. |
| 1974 | United States National Research Act, signed 12 July 1974 | Created the National Commission that later wrote the Belmont Report. |
| 1979 | Belmont Report published | Respect for persons, beneficence, justice. |
| 1991 | Common Rule (45 CFR 46 Subpart A) | A single federal policy for human subject protection in the United States. |
The Declaration of Helsinki remains the ethical source that GCP names directly. Principle 1 of ICH E6(R3) states that clinical trials should be conducted "in accordance with the ethical principles that have their origin in the Declaration of Helsinki".
The harmonization era
By the late 1980s, sponsors were repeating the same trials to satisfy different national regulators. This wasted time and exposed more participants than necessary.
- April 1990 — The International Conference on Harmonisation was founded at a meeting in Brussels. The founders were the European Commission, Japan's Ministry of Health and Welfare, and the United States Food and Drug Administration, together with three industry associations: EFPIA, JPMA and PhRMA.
- 1 May 1996 — The original ICH E6 guideline for Good Clinical Practice reached Step 4, meaning it was adopted as a harmonized guideline.
- 2012 — TransCelerate BioPharma was founded by a group of biopharmaceutical companies. It later created the mutual recognition program for GCP training certificates.
- 2015 — ICH became a legal entity under Swiss law and was renamed the International Council for Harmonisation. Its inaugural Assembly met on 23 October 2015. Write "Council", not "Conference".
- 9 November 2016 — ICH E6(R2) was adopted. It added risk-based quality management and quality risk management as an addendum to the 1996 text.
- 2017 to 2019 — The revised Common Rule was published in January 2017 and generally took effect on 21 January 2019, after delays. Some provisions applied from an earlier date of 19 July 2018.
- 25 May 2018 — The General Data Protection Regulation (GDPR) became applicable in the European Union.
- 31 January 2022 — EU Clinical Trials Regulation 536/2014 became applicable, replacing Directive 2001/20/EC.
The move to E6(R3)
- 6 January 2025 — ICH E6(R3), consisting of the Principles and Annex 1, was adopted at Step 4.
- 23 July 2025 — E6(R3) became legally effective in the European Union.
- 8 September 2025 — The United States Food and Drug Administration is reported to have published final guidance adopting E6(R3). This date comes from a secondary source and should be confirmed against the FDA guidance register before you rely on it.
- 3 June 2026 — E6(R3) Annex 2 was adopted at Step 4. Annex 2 addresses decentralized elements, pragmatic elements and real-world data.
- 15 January 2027 — Annex 2 becomes legally effective in the European Union.
E6(R3) is the operative revision. E6(R2) is historical.
What actually changed in the structure
R2 was one flat document with numbered sections 1 to 8. R3 has a different shape. It is built from a short set of overarching Principles, followed by Annexes that explain how to apply those Principles to particular kinds of trial. Annex 1 covers interventional trials. Annex 2 covers decentralized and pragmatic elements and real-world data.
Three other changes matter at site level. R3 adds a whole new section on data governance, shared between investigator and sponsor. R3 replaces the term "essential documents" with "essential records", because records now include data and metadata. R3 folds the contract research organization into the broader idea of a "service provider".
In practice
Dr. Sarah is a primary care physician. She has been made principal investigator for an ABC Pharmaceuticals hypertension trial. Her coordinator, Ana, finds GCP certificates in the staff files from 2019. The certificates describe "the 13 principles of ICH GCP".
Ana is right to question them. Thirteen flat principles is an E6(R2) description. E6(R3) organizes the principles into 11 categories. The certificates are not fraudulent, but they document training on a superseded revision. Ana raises this with Dr. Sarah, records the gap, and arranges E6(R3) training for all delegated staff before the site initiation visit. She keeps the old certificates in the file. She does not destroy them, because they show what training the staff had at the time.
Every GCP rule exists because someone was harmed without one.
Key takeaways
- The ethical source is named. ICH E6(R3) Principle 1 traces GCP ethics to the Declaration of Helsinki, first adopted by the World Medical Association in 1964.
- ICH was founded in April 1990 in Brussels, and was renamed the International Council for Harmonisation in 2015, so "Conference" is now incorrect.
- ICH E6(R3) Principles and Annex 1 were adopted on 6 January 2025 and became legally effective in the European Union on 23 July 2025.
- Annex 2 is separate and later, adopted 3 June 2026 and legally effective in the European Union on 15 January 2027.
- E6(R3) changed the shape of the guideline, not only its content: Principles plus Annexes, a new data governance section, and "essential records" in place of "essential documents".
- Training certificates naming 13 principles describe E6(R2) and do not evidence current E6(R3) training.