Original sentence: Kelley received no training in oncology; according to Quackwatch his ideas are "largely speculative and invalid".Not only is his therapy ineffective, but people with cancer who take it die more quickly and have a worse quality of life than those having standard treatment, and can suffer serious or fatal side-effects.William Donald Kelley, DDS, MS (November 1, 1925 – January 30, 2005) was an orthodontist who developed the Kelley cancer therapy, an ineffective alternative cancer treatment based on the unsubstantiated belief that "wrong foods [cause] malignancy to grow, while proper foods [allow] natural body defenses to work"
Edited sentence: Kelley received no training in oncology; According to the Sloan-Kettering Cancer Center, not only is his therapy ineffective, but people with cancer who take it die more quickly and have a worse quality of life than those having standard treatment, and can suffer serious or fatal side-effects.The Sloan-Kettering Cancer Center has characterized the treatment as ineffective and Kelley's beliefs as unsubstantiated.William Donald Kelley, DDS, MS (November 1, 1925 – January 30, 2005) was an orthodontist who developed the Kelley cancer therapy, an alternative cancer treatment based on the belief that "wrong foods [cause] malignancy to grow, while proper foods [allow] natural body defenses to work"