Ventana Medical Systems Inc., the medical diagnostic-test maker that Roche Holding AG is attempting to buy, said second-quarter profit fell 3 percent as costs rose. Net income declined to $7 million, or 20 cents a share, from $7.22 million, or 20 cents, a year earlier, the Oro Valley-based company said in a statement on Business Wire today. Earnings beat the 18-cent average of five analysts surveyed by Bloomberg.