Patient Narratives: Where CSR Timelines Actually Go
A patient narrative is a short prose account of what happened to one subject who experienced a significant event during a trial. They sit in the safety section of a clinical study report and its appendices, and ICH E3 requires them.
They are also, routinely, the thing that determines when the CSR is finished.
Who needs one
ICH E3 asks for narratives for subjects who:
- Died during the study.
- Experienced a serious adverse event.
- Discontinued because of an adverse event.
- Experienced other significant adverse events, including those requiring intervention or leading to a dose change.
The count is not predictable from enrolment. A large oncology trial in a sick population can require several hundred, because in that setting serious events are expected rather than exceptional.
What one contains
The nature and intensity of the event, its clinical course, the timing relative to study drug, relevant treatment and concomitant medications, relevant medical history, the outcome, and the investigator's and sponsor's assessment of causality.
In practice each narrative assembles information from several places: the adverse event log, concomitant medications, medical history, laboratory data, dosing records, and the investigator's own comments.
Why they take so long
The data has to be clean first. A narrative written from a database still being queried gets rewritten when the query resolves. This is why narrative writing tends to compress into the window after database lock, which is also the window everything else is competing for.
Each one is assembled from several sources. Pulling a subject's dosing history, their laboratory abnormalities and their concomitant medications into one coherent account is per-subject work that does not parallelise cleanly.
They must agree with the tables. A narrative that says the event resolved on day 14 and a listing that says day 18 is a discrepancy a reviewer will find. Every narrative is another surface that has to reconcile with the safety summary.
They need qualified review. Causality assessment and clinical coherence require someone medically qualified, and that reviewer is usually the scarcest person on the study.
Frequently asked questions
What is a patient narrative?
A prose account of a significant clinical event for one trial subject, required by ICH E3 in the clinical study report.
Which subjects require a narrative?
Those who died, had a serious adverse event, discontinued due to an adverse event, or had other significant adverse events as defined in ICH E3.
How long is a narrative?
Typically a few paragraphs to a page, depending on the complexity of the case.
Are narratives also used outside the CSR?
Yes. Similar accounts support expedited safety reporting, including [IND safety reports](/glossary/ind-safety-report), and periodic safety reports.
Why do narratives delay a CSR?
They cannot be finalised until the data is clean, they assemble information from several sources per subject, they must reconcile with the safety tables, and they require medically qualified review.
Who writes them?
Usually medical writing or a safety function, with medical review of causality and clinical coherence.