Document pe847za2Ly30gv0wdy79DZqDD

FILE NAME Manville JMA DATE 1965 DOC JMA196 DOCUMENT DESCRIPTION Hannon JWG Correspondence { ) 7. Ross K. Childerhose Dr. David T. Dubow Tr Reginald H. Smart Pr Rey R. Whitehead From J. W. G. Harmon M. D. Chairman Seation on the Nature and Prevalence of Occupational Diseases of the 628 Washington Trust Building Washington Pennsylvania 15301 Cheat Res Asbestosis Report Gentleman In the Archives of nvironmental Health of the AMA Volume 10 Number 1 January 1965 there appeared an article on Asbestosis and Long Caneer by W. Jones Williams M. D. apartment of Pathology Welsh National chool of Medicine Cardiff Wales asCo ae Dr. Williams appears to be somewhat critical of our Asbestosis report which he states suggests that the insidence of carcinoma of the lung and ploure is not enhanced in North American cases of asbestosis On page 109 third paragraph of our Asbestosis Reporwte state that the enhanced prevalence of pulmonary neoplasia in some asbestos industries or in sme locations does not appear to apply for the chrysotile industry in North America This comment applies both with intratpo uinltrmaopunlmaonraryy new growths and to pleural mesothelioma We were specific in limiting our comments regarding the incidence of neo lania to the chrysotile industry and although erocidolite and asosite types of asbestos which are mined in South Africa are also used in this country Er illime refers to 17 reprints in his references at the end of the article and we have belti o e belv iee ve that there may be duplication of cases in some of the reports I believe we should prepare an article in answer to Dr. Williams and I would appreciate your commente both as to the misquote and to the references and if you have any additional information would you please write in duplicate sending a copy to me and to Dr. O. . 1. chepers 9011 Spring Hill Lane Chevy Chase Maryland 200158 Febru10ar 19y 65 To Asboe f ths e Ret poro t ons Asbi estos sis continued) After your comments have been received a report will be written sent to all of the Authoor f ts he sbestosis Report for approval and then submitted to Dr. Mours ofcthhe College for approval and publication I m enclosing a copy of our Asbestosis Report and a photostat of Dr. Alli paper. Sincerely youre C JWGR / Thetford Industrial Clinic Thetford Mines Que February 18 1965 Dr. J.W.G. Hannon Chairman Section of the Nature and Frevalence of Occupational Diseases of the Chest 628 628 Washington Trust Building Washington Pennsylvania 15301 Re Dear Dr. Hannon Asbestosis Report . This question of a possible relationship between Lung Cancer and the Asbestos Factors remains in my mind as in the mind of many others more and more confused I am not qualified and I am not ready to | make a definite statement and I do not think either that the data ' available on Clinic since more 1945 than have 8,200 asbestos workers seen at the been studied at their full value Thetford In a few months I will be in a position to know the total number of confirmed primary lung cancer in relation to the total number of employees to the total number of autopsies ' among those employees and also according to age groups and to the intensity of dust exposure - - Moreover following the New York Conference the is likely that the Canadian National Research Council and the Department of Epidemiology of McGill University are going to realise an epidemiological study among the asbestos workers of the . Province of Quebec So far among the asbestos workers of the incidence of the whole of of many other counties of the the incidence of Cancer of the lung the Thetford district is higher than Quebec higher also than the incidence Province but lower than the incidence cont'd Thetford Industrial Clinic | Thetford Mines Que -2- observed in the City of Montreal and much lower than the incidence found among the veterans of the Canadian Army One problem for| the statisticians consulted is to find a sound control group submitted to the same medical investigation and also with the same autopsy rate an It has seemed that a comparable autopsy rate is of to make a comparative study obvious to the statisticians first importance if we want precisely to realize that I would be pleased to try to answer | more any questions you may wish to address to me but I this question is very controversial and a difficult Sincerely yours c.c. to Dr. G.W.H. Schepers Paul Cartier M.D. WILLIAM J. L. McCULLOUGH M. D. CLARENCE J. McCULLOUGH M. D. JOHN W. G. HANNON M. D. 625-838 WASHINGTON TRUST BUILDING WASHINGTON PENNSYLVANIA February 26 1965 KWS KWS KWS CLS | Dr. Kenneth W. Smith Medical Director Manville Corporation 22 East 40th Street New York 16 New York Dear Ken Enclosed you will find a copy of a letter from Paul Cartier regarding the Asbestos Report : I believe Paul's reaction is very good and points out the difficulty of getting a true statistical analysis of the problem Both Skip and I would appreciate any comments you may make as I firmly believe we must answer the paper of Jones Williams Best regards Sincerely yours JWGH Encl Je W. G. Hannon M./D