Unit 731
In the dark basement archives that detail the history of unethical medical trials it is important to remember that even from the countries or cultures without notable documented cases it would hardly constitute a challenge to find equally distinguishable breaches of ethics, if not perhaps in the name of medical science.
I have to give the introduction above to feel that I am not being unfair to post here the example of perhaps the most shocking single case of atrocious medical research that emerged from a country with a cultural history at least as interesting and rich as any I have come across. Unit 731 was a research facility under the control of the Imperial Japanese Army between 1935 and 1945 in an area of north-eastern China under Japanese control.