An electronic trial master file (eTMF) is the software in which every official document of a clinical trial is stored, with each version and each signature recorded. The trial master file, or TMF, is the complete paper trail of a trial. Global rules on good clinical practice, followed by regulators including CDSCO in India, say that it must be kept and shown to inspectors on request. The eTMF is a part of the clinical trial data platform.
What goes into it? Every document that shows the trial was run as planned. Examples are the trial plan, called the protocol, and each change to it. Others are each hospital's ethics committee approval, the CV of each trial doctor, the signed list of who at each hospital may do which task, staff training records and the report of every monitoring visit. There are usually dozens of documents for each hospital, and thousands for the whole trial.
Here is a typical case. A trial of a new tablet for anaemia runs at 40 hospitals in India. The eTMF holds a list of 60 documents that each hospital must file, so it expects 2,400 documents in all. Each document is uploaded with its type, its hospital and its date. When a document is approved, the approver signs it with an electronic signature, and the eTMF records who signed it and when. A new version never replaces the old one silently. Both are kept, so an inspector can see what changed.
A month before an inspection by CDSCO, the trial team checks the eTMF's completeness report. It shows that 2,328 documents are filed, which is 97%, and that 72 are missing. Most of the missing ones are training records at six hospitals. The team asks those hospitals for the records and files them before the inspectors arrive.
Why does this matter? If a document is missing, an inspector cannot tell whether the step was done. Under GxP rules, a step that was not recorded is treated as a step that was not done. A missing ethics approval can make a whole hospital's data unusable.
How is the eTMF different from an ordinary shared drive? A shared drive lets anyone overwrite a file. The eTMF keeps every version, records every view and every change in an audit trail, and checks each upload against the list of expected documents. The trial's patient data itself is kept separately, in electronic data capture.