The phrase "key relevance" is grammatically correct and can be used in written English.
It is often used when discussing the importance or significance of something in relation to a specific topic or situation. Example: "The key relevance of this study lies in its ability to offer new insights into the treatment of cancer."
Bargaining between multinational enterprises (MNEs) and organized workforce is a subject of key relevance in modern economics.
This problem is of key relevance in the design of modulation signal sets for digital communication over time-invariant channels.
Materials research is a field of key relevance for innovative nuclear systems, such as Generation IV reactors, critical and sub-critical transmutation systems and fusion devices.
The identification of bad practices leading to performance flaws is of key relevance to avoid expensive rework in redesign, reimplementation, and redeployment.
Of key relevance is linking classes of chemicals to the reactions that can be used to synthesize them, such as those described in the Name Reaction Ontology (http://rxno.googlecode.com/).
Particularly notable are the evaluations on the patterns and causes of land use change and its consequences for biodiversity — studies of key relevance to identify potential threats and conservation strategies.
Watt attains a similar low-key relevance on "Hendra," his return to the solo songwriting career he put aside following 1983's "North Marine Drive" to concentrate on Everything But the Girl.
In pop music, hindsight is the key to relevance.
For the next release, due later this year, they will beef up the recommendation feature, search functionality, and continue to improve personalization, which they see as key to relevance.
We therefore reveal the key physiological relevance, together with the regulatory mechanism, of intra-adipose sympathetic plasticity in the WAT metabolism.
By using the particle tracking approach it was possible to quantify the duration of any oscillations in substrate concentration that the cells experience, a question of key physiological relevance.
