The phrase "as a key topic" is correct and usable in written English.
You can use it when discussing an important subject or theme within a larger context, such as an article, presentation, or discussion.
Example: "In our upcoming conference, climate change will be addressed as a key topic in several sessions."
Alternatives: "as a central theme" or "as a main focus".
In recent years, mining high-utility itemsets (HUIs) has emerged as a key topic in data mining.
Since elevated temperatures greatly shorten the lifetime of semiconductor devices, thermal management has emerged as a key topic in the design and control of computational platforms.
In 2002, given recent developments, NAGPS members identified foreign student issues as a key topic and, in mid-February, took it to "the Hill".
Industry groups like The GIIN Global Impact Investing Networkk) should incorporate aging as a key topic for their work, and perhaps it's time to consider an 18th SDG to address aging.
Facebook's issues with viral false news reports dominated headlines this week, so naturally it came up as a key topic of discussion when I spoke to TechCrunch's special projects editor and internet culture reporter Jordan Crook on this week's episode.
Education too has emerged as a key topic.
Lombok was a particularly relevant choice, and itself a key topic, as it faces big development decisions, fuelled by an upturn in tourism.
Resilience is a key topic as communities adapt to rising sea levels, more frequent or stronger natural disasters and economic changes.
Engagement: Engagement between shareholders and the board will remain a key topic of interest (as discussed for the first time in the report of the High Committee of Corporate Governance).
The design of optimized scaffolds for tissue engineering is a key topic of research, as the complex macro- and micro- architectures required for a scaffold depends on the mechanical properties, and the physical and molecular stimulations of the surrounding tissue at the defect site.
In this Master's degree, "Parallel Programming" appears as a compulsory subject because it is a key topic for them.
