Document dYVNKD2rqZbmNRbGMJO1Eeq6Q

"V I 82 BRITISH JOURNAL OF INDUSTRIAL MEDICINE Table 2 OCCUPATIONAL HISTORY AND NECROPSY DATA OF ASBESTOS WORKERS WITH PRIMARY LUNG CANCER 5,ci i of 1 finj 1 Death j Ajt OcCQpMioM IMS M.62 Wcavr Period or Eiyouift ` 1919-32 Yean of * Yean 1 Years I Exposure > from I or. before * . Hnl j Exposure ' Jaiv. 1, j Expowc ] ! * 1933 to Death ] I 13 13 , 16 Yean f0*sr* 3 Fathotoicat Report ifiewtl Hittoleyical Tp of Primary Left: Cancer Carcinoma** 1935 1936 tJ 1939 1940 1941 1942 1948 ` 1948. 1948 194S 1950 M. 34 Weaver 1909-31 M.65 M-47 M. 49 Fiberiur Wcmr Disintegrate? M. 32 DiRoUsnicr M.J2 . .Weaver M-59 Bay earner M.39 Weaver M.JJ Weaver 1913-36 /I9IO-IJ \ 1920-37 /19I0-14 \1919-39 f 1911-15 < 1919-21 ( 1921-39 j 1913-19 \ 1924-35 1913-41 /J9J2-I4 \1918-4S 1921-03 M.45. Spinner 1923-48 M.65 MauUeaanc*man 1919-48 JF. 31 Spinner 1913-0 23 23 23 19 19 14 24 17 I aa 15 20 >4 28 19 32 IS 13 10 2fi 10 29 13 27 17 26 5 i 23 Leu than 1 ] 28 * 29 Lett than 1 1 29 - Lett than 1 |j -- EpilhcEil carcinoma Endothelioma ofpleora MCifciftooa" ** Carcinoma** " Carcinoma M ' 78 3 29 36 . Leu than 1 26 26 Lett than 1 29 Lets than 1 -33 S ' 0*t-c*U*d carcinoma OaleelW carthoou - -S' a Anaplastic titonoim ** Carcinoma " ** Carcinoma ** Oat<eQcd camooma ** Carcinoma ** 1931 M.74 Ftberaer 1917-43 26 15 34 8 Adenocarcinoma 1951 M.60 Weaver /1919-23 \ 1929-30 27 9 32 J ** Carcinoma ** ?. 1934 M.36 Weaver 190-44 , 2 0 2' Lett than) Absent Oat-celled carcinoma 1951 . M. 41 FZbcmer 1952 M-51 Weaver 1939-48 . ft941(3,'12) \ 1943-52 1 9 7 0 12 3 | - Anaplastic carcinoma 0 l\ Less than 1 ** Carcinoma** i- % "Abo putmoiury luboculOM. it and a great Increase in the number of lung cancer Method of Estimation of Risk 5- deaths was also recorded among the whole popu Although the necropsy data shown in Tables I t~, fr . cT- C^V lation of England and Wales over the same period. and 2 suggest (1) that some groups of;asbestos It might, therefore, have been anticipated that a twotkers'have suITeredlan increased, risk of lung larger number of cases in which the two conditions canccr.and (2) that the riskmay now have decreased. were associated would have been found in the last' It is not possible to be certain of either of these s. 10 years. National regulations for the control of propositions without a snore detailed knowledge of asbestos dust were, however, introduced in 1931 the whole mortality experience of the workers. The (Asbestos Industry Regulations, 1931) and the Erst proposition has, therefore, been tested by precautions taken to prevent dust dissemination in comparing the mortality experienced by that section O'&L the works had become effective by the end of the following year. All the subjects in whom the two diseases were found -together had been employed of the male employees of the works referred to above, who had worked for at least 20 years in ** scheduled areas *', with Ihe mortality recorded for Zr$S.\ for at least nine years under the old conditions, and all men in England and Wales; and the second -although 11 of the IS men and women died within proposition by comparing the incidence of lung **- 30 years of their first'exposure," the association -of cancer among men employed for different periods fs the two conditions has-'hbfyet'been found in any under the prc-1933 conditions. The investigation f. <vt*; **- person taken -into.'employment^during the fast 31 years (1923-53). It is, therefore, possible that the reason more cases were not found in the second half was limited to the small group of men who had been employed for at least 20 years, since the labour involved in searching out the individual records of I of the period is that reduced exposure to dust has already begun to lessen the incidence and severity * By ."jcMukd reas?tit mr>arihotcif<fts,-)hcra.prQuM . ?K' of asbestosis. kttc garrkd oa >hicb fecrcttchctlukd^vnder the Albe*to Industry Kcioiai'vom of lWJ &s feting dusty. >si