On Monday (Dec. 4), she drew on all those roles during a lunchtime talk to most of her fellow fellows. Ganmaa's topic was lunch-appropriate: the suspected role of cow's milk, cheese, and other dairy products in hormone-dependent cancers. (Those include cancers of the testes, prostate, and breast.) The link between cancer and dietary hormones - estrogen in particular - has been a source of great concern among scientists, said Ganmaa, but it has not been widely studied or discussed.