The phrase "a leading topic" is correct and usable in written English.
It can be used to refer to a main or prominent subject of discussion or focus in a particular context, such as an article, presentation, or conversation.
Example: "In today's meeting, we will discuss a leading topic in the field of renewable energy: the impact of solar technology on reducing carbon emissions."
Alternatives: "a primary subject" or "a central theme."
In Beatty, the issue has been a leading topic of discussion.
Ms. Yuan's death was a leading topic on Sina Weibo, but suggestions of rape and murder were still being deleted.
Marina Van, the executive director of the East Hampton Chamber of Commerce, said Citarella was now a leading topic of conversation.
The company's failure may well become a political football in the presidential campaign, in which energy policy has been a leading topic.
Mr. Putin met at the Kremlin on Monday with President Bush's national security adviser, Condoleezza Rice, and Russian involvement in Iraq's reconstruction was a leading topic, a senior United States diplomat said.
But the absence of climate change as a leading topic in the election of Donald Trump is perhaps the single greatest rebuke to the idea that power should be held to account for the benefit of this and future generations.
But on Friday, when Davis again became a trending — or leading — topic on Twitter, she was the subject of widespread condemnation, for a TV advertisement targeting her GOP opponent in an uphill fight for Texas governor.
First presented as a side-topic in network theory, it has now become a whole field of research in itself, and has been for a few years the leading topic of NetMob, an international conference on the analysis of mobile phone datasets, of which the fourth edition took place in April 2015.
The three-day lineup includes an antique-tractor show, an old-time-fiddlers' contest, and a headline lecture series, whose leading topic seems to be the perniciousness of genetically modified foods, presented by speakers who speculate that the herbicide glyphosate (a.k.a. Roundup) may trigger autism, and who cite as credentials their status as moms and dads.
If it weren't for the debate over a war with Iraq, the economy would probably be the leading topic on the campaign trail.
It is natural for there to be a few hundred, or even thousand, fanatics in a country, but it is anything but natural for the biggest TV channels to have them as guests every day and the leading topic of news bulletins Avgi, leftwing daily Here's a coincidence: the re-release of the Exorcist opens in Athens cinemas today.
