IIRC it did, though the cynic in me would suggest that by “this kind of corruption” what it prevents is the kind of corruption that government officials don't benefit from.

I trust the Chinese government less than I trust my own with regard to doing the right thing (just because it is the right thing or indeed at all), and that is a pretty low bar…

The regulation is approval by a governmental agency through clinical trials

This wiki article is probably the best place to start:

https://en.m.wikipedia.org/wiki/Death_of_Wei_Zexi

Then there was some movement on the issue in 2019:

https://www.bloomberg.com/news/features/2019-12-10/cancer-tr...

I’m not sure where they ended up due to COVID happening next.