Here is Dr. John McDougall's article which includes his original published findings from 1984 and the ACS just published (Feb 15, 2015) recommendation (the 23 page report included in the article). I would say he is vindicated and his bio at Wikipedia should change the his diet category from "fad" to "ACS recommended".
https://www.drmcdougall.com/misc/2015nl ... cancer.htm"On February 13, 2015, the American Cancer Society published their recommendations that cancer survivors should follow "prudent diets," plant-based diets that are high in fruits, vegetables and unrefined grains while at the same time being low in red and processed meats, refined grains, and sugars. Its report states, "These diets are contrasted to 'Western' diets,' which have the opposite pattern and are heavy in meats, sweets, other processed foods, and dietary fat." They also recommend weight loss and exercise in order to prolong survival for people with cancer.
This turn in thinking about the importance of food is especially important because the latest statistics (2015) from the American Cancer Society show little improvement in survival rates over the past 40 years for cancer patients; regardless of the good intentions of their practitioners, aggressively attacking their tumors with surgery, radiation, and/or chemotherapy. (Improvements from standard medical treatments have been limited mostly to childhood, blood, and lymphoid cancers, representing fewer than 10% of all cancers.)"