The King of Sublime Madness by Leland Riley

Joel Bigelow, a former minor-league baseball player, is near death from Hodgkins Lymphoma, diagnosed as resulting from his abuse of human growth hormone. Joel became very wealthy after his baseball career, purportedly through inheritance and real estate dealings. During his therapies Joel pledged six million dollars to the development board at the hospital treating him. Dr. Martin Ridgley, a retired oncologist serving on the development board, offered to spend some time with him in these dying days and becomes conflicted when he learns the gift may have come from ill-gotten gains. Both Joel and Dr. Ridgley become entangled in an agreement that twists the ethics of medical research and the price some will pay for a chance at fortune and fame.