ALBUQUERQUE, NM -- (MARKET WIRE) -- July 21, 2006 -- Exagen Diagnostics, Inc., which develops and commercializes genomic marker-based in vitro diagnostic (IVD) kits for predicting risk of recurrence or treatment response, today announced that Luc Van Hove, M.D., PhD, CSSBB, has joined the company as vice president, quality, regulatory, medical affairs and chief medical officer.