I've been rereading the 1996 bestseller NEANDERTHAL, by John Darnton.

Without giving away too many spoilers, paleoarchaeologists trek to the Pamir mountains in search of ancient hominids.

I've looked at the location of the Pamir range in relation to the Tibetan plateau. Also, I found this article on the genetic makeup of modern Tibetans: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5011065/ .