[inno89]

Actually the biology and medicine terms come from Greek and Latin. The only use of learning German is to read research papers, mainly old one's from 1940's or so that contain a goldmine of information (especially chemistry research), and as well as the papers being published today.

I was researching the same thing as well (medical university's in Japan) and yes, you of course must have a strong knowledge of Japanese. The best way of course, is to be in Japan for a while and immerse yourself in the language; this is provided that you're actually going out rather than staying in your room all day...