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June 1, 1951
?sul Cartier, a,D. Thatford Industrial Cllnle Thetford ''inea, Quebec
Kenneth W. Smith, W,D. Canadian Johne-Manville Company, Ltd, P.0. Bo* 1600 Asbestos, Quebec
Dear Paul and Earn
In accordance with our discussion, the revised fore to be used in the epidemiological survey of asbostosis and cancer is attached. As I reeambor, you wt to prepare a sufficient number of copies to cover the oase roentgenograms of nan employed during the last five years.
It was thought, you will recall, that only the last roentganograa of each case would be reviewed. Also, it is important that pertinent data be entered in all other colons of the fore. In that regard we recognised that the location and exposure colas would offer sane difficulties, As you nay roasbsr, a Job analysis would have to be carried on by both of you so that the operation in Thetferd night be eaaparad with a ainilar one in Asbestos, The location would be identified by a large maeeral and the exposure in years (or months) by e snail sub-numeral.
It nay interest you to know that during my last visit to Sew
York I had the opportunity to participate in an infernal discussion
regarding asbestosls and pulmonary eancsr. On# of the discussants
waa drawing conclusions but on only a very fee eases and, as he
adnitted, with littla. If say, knowledge of asbestosla. This emphasises
ths lnportanes of your epidemiological study
the urgency with which
it should go forward,
Hedge sad I heps to be visiting you sons tins this summer, Ontil then, every good wish.
Sincerely years.
A5V i lr Dnc, cct Hr, Ivan Sabourln
Arthur J. Vorwald, M,D.
Director, The Trudeau Foundation
and The Saranac Laboratory
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ASBESTO SIS AND PULMONARY CANCER
E p id e m io lo g ic a l S urvey Based Upon C hest R oentgenogram s
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