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A Clinical Overview (CLO) is required as part of marketing application dossier and is a succinct discussion and interpretation of the findings from clinical trials together with any other relevant information. The purpose of the CLO is to provide a critical analysis of the clinical data in the Common Technical Document (CTD) (Module 2.5). In other words, the CLO should primarily present the conclusions and implications of those data, and should not recapitulate them.
The CLO presents the strengths and limitations of the development program and trial results, analyses the benefits and risks of the medicinal product in its intended use, and describes how the trial results support critical parts of the product labeling/prescribing information. In addition, any particular efficacy or safety issues encountered in development and any unresolved issues, with plans to resolve them, should be included.
The CLO is not updated systematically, but an addendum may be prepared to support the update of Prescribing Information (eg, due to post-marketing safety issue) or as a follow-up post-marketing commitment/measure.
Writing the CLO is a collaborative effort involving many functions. The large number of sources, dossier size, and data complexity as well as the timelines and the simultaneous development of several CTD documents. It is therefore crucial to determine the key messages as early as possible.
Emtex Life Science medical writers can play a key role in the document development process, by ensuring that the data are well structured, the key messages are brought forward clearly, it is a high-level summary, and ensuring consistency with other CTD documents that are developed in parallel.
FAQ: Clinical Overview
What is a Clinical Overview (CLO)?
A CLO is a succinct discussion and interpretation of clinical findings and other relevant information, providing a critical analysis of the clinical data in the Common Technical Document (CTD) (Module 2.5).
What information does the CLO include?
The CLO presents strengths and limitations of the development program and study results, benefit–risk analyses, key messages supporting product labeling, and any unresolved safety or efficacy issues with plans to address them.
When is a CLO needed?
A CLO is required as part of a marketing application dossier and may be supplemented with an addendum to support updates of prescribing information or post‑marketing commitments.
How can Emtex Life Science support the preparation of a CLO?
Emtex Life Science can support the CLO (addendum) process by coordinating contributions from all relevant functions, managing review cycles, implementing comments, and ensuring that the CLO is clearly structured and aligned with regulatory expectations and other CTD documents.
Why is professional medical writing support valuable for a CLO?
Professional medical writing support ensures clarity, high‑level synthesis of complex data, strong key messages, and consistency with other CTD documents developed in parallel.