The following article caught my eye.  The breast part comes later.
This is a short excerpt from the following website:

Obscure language links Asians and Native Americans
http://www.cnn.com/TECH/science/9811/08/science.languages.reut/

A few words in one of the planet's most obscure languages support
the theory that Native Americans left Asia in several separate
migrations, a linguist said in an article to be released Monday.

Merritt Ruhlen of Stanford University has found compelling similarities
between Ket, a language spoken by just 500 people in remote Siberia, and
Na-Dene, a family of Native American languages.

In Ket the word is pronounced something like "ch'ee" -- a sound hard to
transliterate into English. In several existing Na-Dene languages it is
pronounced similarly.

The words for breast also correlate. In Ket the word is "tuhguh"
and in the Na-Dene Koyukon language it is "t'uga.'"

Jon Ahrendsen MD FAAFP
Becky Ahrendsen RN IBCLC
Clarion, Iowa