Johns Hopkins Kimmel Cancer Center has received a $20 million donation for pancreas cancer research and patient care, the largest donation for such research in its history. The award came from Albert P. "Skip" Viragh Jr., founder of Rockville-based Rydex Investment, a mutual fund investment company. Viragh, who died of the disease at 62, was a Hopkins patient. The money will fund the existing laboratory, expand clinical programs and contribute to new research at the newly named Skip Viragh Center for Pancreas Cancer Clinical Research and Patient Care. Officials there say the money will strengthen their ability to prevent, treat and ultimately cure pancreas cancer, the fourth leading cause of cancer death.