[yipopov]

What's the relevance of the minority status?

Would a drug proven effective for whites and ineffective for blacks in the US suddenly become effective for blacks and ineffective for whites if administered in Zimbabwe?

Or do you mean "minorities" in the "there are too many minorities in my waterpark" sense?

[to3m]

The article mentions in the first sentence that it is about North America. So presumably it is talking about specific apparent population groups that are minorities in North America? With this in mind, you can probably imagine some examples. But the first sentence does include some, if you're unfamiliar with America.

[blaurenceclark]

It would mean that if a drug was inefficient on an African American of Zimbabwe descent, the same drug would be unlikely to be efficient on the black people Zimbabwe. There are measurable genetic traits these can be attributed to, although unfortunately they are less understood for minority populations.