Kelley formulated his own ideas about cancer, basing them on those of
Max Gerson, and named his treatment "non-specific metabolic therapy". According to Kelley, cancer is a single disease caused by the lack of certain
enzymes. Kelley also added prayer and
osteopathic manipulations to his treatment regime. According to the center, "findings from a study involving patients with inoperable pancreatic cancer showed a decrease in overall survival and poorer quality of life ... compared to standard
gemcitabine-based chemotherapy." The coffee enemas that form part of the treatment can have harmful, and possibly deadly, side effects. ==Later career and life==