“…As an example of the diversity of opinions on the subject, contrast the first quotation by Cowdry (2) and the second by Wainwright (3). Cowdry: “Some reported instances of single trauma cancers in man fulfill all of the necessary criteria for a positive diagnosis, but these are of rare occurrence.” Wainwright: “If we admit that the relationship has been a true one, even in one case, we must consequently admit that it may likewise be a possibility in any other case in which this relationship comes up for serious consideration.”…”