Document Ed5xZDVMOqx8NYENNG4VnqX8n
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Journal Title: American journal of industrial medicine Volume: 10 Issue: 5-6
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Month/Year: 1986 Pages: 479-514
Article Author: Seidman H;Selikoff IJ;Gelb SK
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Article Title: Mortality experience of amosite asbestos
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480 Seidman, Selikoff, and Gelb
is that there usually is a lengthy latent or induction period between the exposure and the subsequent overt emergence of cancer.
Most carcinogenic agents leave an imprint for the cancer but then are excreted or metabolized so as not to be discernible when the cancer becomes evident years later. With asbestos, including amosite asbestos [Selikoff et al, 1972], large amounts of the material are retained in the tissues and fibers are readily identifiable at autospy or biopsy using extraction and electron microscopy techniques [Langer et al, 1973].
It is plausible that the presence of the residual retained asbestos constitutes continuing exposure, which may be termed in situ or residence exposure. Cancer is not the only concern of such exposure. Asbestosis, known principally as a fibrosing disease, may also be lethal after many years. The direct dose as well as the time in residence are then both of great significance.
We have previously reported on the mortality experience of a group of Paterson, New Jersey, amosite asbestos factory workers from the onset of work during the years 1941-1945 through 35 years thereafter [Seidman et al, 1979]. Some of these men had a very limited duration of direct asbestos exposure.
It was found that work exposure to amosite asbestos for as short a period as one month resulted in a clear excess risk of cancer.
With longer periods of exposure (ie, two months, three months, six months, and so on), the cancer risk became greater.
With very brief direct exposure, cancer risk was to be found increased only after a latent period of 25 years. On the other hand, longer employment resulted in excess risk of cancer being found after shorter postexposure observation periods.
This report is an expansion of the previous study. In addition to an extension of the follow-up period, findings are given in terms of the jobs of the workers and estimates of the dose of fiber exposure (dose = concentration x time) accumulated by the workers during their work at the factory.
We have had the opportunity to extend the observation period through December 31, 1982, and thereby the analysis was extended to 40 years after onset of work. At each updating, we thoroughly review the information available for each man and present our results according to the best assessments we can make at that time. This usually results in some very small changes as compared with previous reports.
MATERIAL
Just before the entry of the United States into World War II, an amosite asbestos factory was established in Paterson, New Jersey, to supply the U.S. Navy with asbestos insulation for the pipes, boilers, and turbines of its ships. From June 1941, when the factory began operations, through December 1945, 933 men were recruited to work in this plant, which continued in operation until November 1954. Though nonwhites were employed in the later years of the plant's operation, the initial group was almost entirely white. Wartime conditions had a marked influence on the com position of this work force. Younger and fitter men having been siphoned off by the Armed Services, the men employed tended to be older than is usual for those entering a new line of work. There were very few "career" men (only 21 had worked with asbestos previously); in contrast to other groups of asbestos workers that have been studied, composed largely of those who continued to work in the industry once they
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accordance with Seidman et al [1979], Hammond et al [1979], and Selikoff et al [1979].
"All asbestos diseases" has coherence to us only in terms of best evidence available and only such coding is used for this category. However, some results according to coding of the death certificate information only are detailed for other cause of death categories.
Omitting the first five years after onset from our analyses had a number of advantages. It reduced the possibility of the "healthy worker effect" in mortality selection and permitted an unequivocal classification of the men into length-of-timeworked categories. As is usual, the suitability of the general population of an area to portray what the mortality risks of a specific group of workers would have been without their special exposure, is subject to question. As compared with the general population, which includes many persons with sedentary occupations, factory workers might be expected to have lower rates of coronary death, for example, presumably owing to occupational exertion and/or selection. These might well be balanced by higher death rates from other social and life-style differences. With respect to cancer rates, it is known that New Jersey rates are among the highest in the United States [Mason and McKay, 1973].
Of the 933 men recruited to work in this factory from June 1941 through December 1945, 113 men were omitted from further analysis for not attaining the five-year point after start of employment: 21 had prior asbestos work, 14 more took up asbestos work elsewhere before the five-year point, 40 had died, and 38 were lost to follow-up shortly after terminating employment. Table I shows the status of the 820 men who remained for study at the five-year point after start of work and at each subsequent five-year point until either the 40-year point or the termination of obser vation, December 31, 1982. By that time we had determined that there were 6 men who were kept in the study until they began asbestos work elsewhere, 5 men who were lost to follow-up, and 593 men who had died. Only 216 men were still alive at risk in the Study Group, 95 had completed 40 years of follow-up, and 121 were still alive in the 38th to 40th years of follow-up on December 31, 1982.
RESULTS
Table II shows the total observed and expected deaths and SMRs from 5 to 40 years after onset of work for various causes of death. SMRs of 500 are evident for lung cancer and for noninfectious pulmonary disease, while that for total cancer is almost 300 and for all causes of death is as high as 167. A statistically significant SMR of almost 200 is seen for colon-rectum cancer.
Table HI shows the same information (BE) for each five-year period for several of the causes. Expected deaths are not available for mesothelioma and asbestosis, which are very uncommon in the general population. Instead, death rates per million man-years (not adjusted for age) are shown for these causes. Mesothelioma, which usually shows a strong relationship with advancing time since onset of exposure, here shows an anticipated rise in death rates for the 20-24-, 25-29-, and 30-34-year periods but tails off in the 35-39 year period, perhaps partly due to previous heavy selective mortality from other asbestos associated diseases.
For the men who worked various lengths of time from less than one month to 2-14 years (when the factory closed), Tables IV-XI show the cumulative mortality
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TABLE VIII. Cumulative Observed and Expected Deaths From 5 to 40 Elapsed Years Since Onset of Work in an Amosite Asbestos Factory, 1941-1945, by Length of Time Worked: Noninfectious Pulmonary Diseases (Observed Number of Asbestosis Deaths Shown in Parentheses)*________________________________________________________________________________________
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TABLE X. All Causes: Standardized Mortality Ratios for Cumulative Deaths From 5 to 40 Elapsed Years Since Onset of Work by Length of Time Worked
Length of time worked
< 1 Month 1 Month 2 Months 3-5 Months 6-11 Months 1 Year
2+ Years
Elapsed No. of years since onset of work
5-9 5-14 5-19 5-24 5-29 5-34
6 17 9 33 49 59 9$91 131 13d 137 141
105 101 US 116 131 133
112 ; s 140
156
184
183
179
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151 159 178 180 196 206
5-39
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TABLE XI. Lung Cancer: Standardized Mortality Ratios for Cumulative Deaths From 5 to 40 Elapsed Years Since Onset of Work by Length of Time Worked______________ _____________
Length of time worked
Elapsed No. of years since onset of work: Observed (BE)a
5-9 5-14 5-19 5-24 5-29 5-34 5-39
< 1 Month 1 Month 2 Months 3-5 Months 6-11 Months 1 Year 2+ Years
OO
0 79 145 208 252
0 217 4S8 331 308 337 281
O 0 104 226 373 423 371
0 9 128 233 254 300 339
0 204 476 574 479 509 498
870 625 645 694 717 770
385 738 974 886 977 970 983
"BE, coding of cause according to best evidence available.
results at five-year intervals to 40 years since onset of work, respectively, for all causes of death, all cancers, lung cancers, gastrointestinal cancers, noninfectious pulmonary disease (including asbestosis), and "all asbestos diseases." The data are shown on a cumulative basis to illustrate that, in general, the heavier the dose as measured by the length of time worked, the shorter the time in which an adverse effect is observable. Thus, for cancer of the lung in Table VI, marked excesses are evident within 15 years for the longer-term workers. For those who worked shorter periods of time it may take 25 years or more. Also in Table VI it is clear that the heavier the dose, the greater the response tends to be in terms of higher SMRs. Some of these findings may also be seen in Figures 1-6 and Tables X-XIII.
During World War II, between 300 to 400 workers were employed at any one time at the Union Asbestos and Rubber Company factory in Paterson, New Jersey. During peak production, three shifts were worked. There was a great deal of turnover, some men being drafted into the Armed forces and others moving on in short order to other employment. Postwar, the workforce was down to about 100 until the plant closed in 1954.
Amosite asbestos was used virtually exclusively. No crocidolite was used and very little chrysotile. The amosite arrived as a crushed stone from Africa and was
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494 Seidman, Selikoff, and Gelb LENGTH OF , TIME WORKED
I MONTH 2M0NTH8 3- S MONTHS 6-11 MONTHS 12-23 MONTHS
24+ MONTHS
iOO 200 300 400 600
STANDARDIZED MORTALITY RATIO Fig. 4. Ratio of cumulative observed to expected probabilities of dying from all causes from 5 through 40 elapsed years since onset of work in an amosite asbestos factory, 1941-1945, according to length of
time worked.
LENGTH OF r TIME WORKED
1 MONTH 2 MONTHS 3-5 MONTHS 6-11 MONTHS
I YEAR
500
1000
1500
STANDARDIZED MORTALITY RATIO
Fig. 5. Ratio of cumulative observed to expected probabilities of dying from lung cancer from 5 through 40 elapsed years since onset of work in an amosite asbestos factory, 1941-1945, according to
length of time worked.
LENGTH OF TIME WORKED
3-5 MONTHS
6-11 MONTHS
I2-23MONTHS
24 4- MONTHS
___ 500
1000 1500 2000
STANDARDIZED MORTALITY RATIO Fig. 6. Ratio of cumulative observed to expected probabilities from all "asbestos" diseases from 5
through 40 elapsed years since onset of work in an amosite asbestos factory, 1941-1945, according to
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_ _ _TABLE X III. Estimated Exposure to Fibers > Sfim in Length per cc for Jobs in an Amosite Asbestos Factory and Number of Workers
W ith Onset o f W ork 1941-1945 by Length o f Time Worked: 820 Study Group Men
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498 Seidman, Selikoff, and Gelb
Cumulative observed and expected probabilities of dying from all causes by estimated fiber Fig. 7. from 5 through 40 elapsed years since onset of work in an amosite asbestos factory, 1941exposure 1945.
Fig. 8. Cumulative observed and expected probabilities of dying from lung cancer by estimated fiber exposure from 5 through 40 elapsed years since onset of work in an amosite asbestos factory, 1941-- 1945. Observed lung cancer deaths shown are those classified according to best evidence available.
Fig. 9. Cumulative observed and expected probabilities of dying from all "asbestos" diseases by estimated fiber exposure from 5 through 40 elapsed years since onset of work in an amosite asbestos factory, 1941-1945. See text for definition of all "asbestos" diseases.
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i f*SM R not shown both observed and expected deaths are less than 5. Expected deaths based on New Jersey white male quinquinnial age and
calendar year period specific death rates. BE, coding o f cause according to best evidence available; DC, coding o f cause according to death
certificate information only.
504 Seidman, Selikoff, and Gelb
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1.20
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508 Seidman, Selikoff, and Gelb TABLE XX. All Causes: Standardized Mortality Ratios for Cumulative Deaths From 5 to 40 Elapsed Years
Fiber-years per cc
<6.0 6.0 - 11.9 12.0 - 24.9 25.0 - 49.9 50.0 - 99.9 100.0 - 149.9 150.0 - 249.9 250.0 +
5-9
88 106 w
73 185 125 196
5-14
85 100 127 127 109 188 191 171
Elapsed No. of years since onset of work
5-19
5-24
5-29
99 Iliiilli! 122 140 154 145 172 168 168 163 186 112 138 159 191 186 187 179 159 184 224 240 266
5-34
160 169 204 172 183 195 291
5-39
160 172 199 174 181 199 291
TABLE XXL Lung Cancer: Standardized Mortality Ratios for Cumulative Deaths from 5 to 40
Fiber-years per cc
Elapsed No. of years since onset of work: Observed (BE)a
5-9
5-14
5-19
5-24
5-29
5-34
<6.0 6.0 - 11.9 12.0 - 24.9 25.0 - 49.9 50.0 - 99.9 100.0 - 149.9 150.0 - 249.9 250.0 +
0 122 267 217
0 Cl 148 323
0
& 152
328
0 213 476 462
0 1,087 750 593
571 741
769
714 1,290 1,600 1,233
909 667 1,000 1,029
248 354 342 535 625 769 1,122 1,342
301 383 382 508 704 615 1,026 1,667
aBE, coding of cause according to best evidence available.
5-39
282 415 442 468 714 604 1,136 1,596
TABLE XXII. Ail Asbestos Diseases: Standardized Mortality Ratios for Cumulative Deaths From 5 to 40 Elapsed years since onset of work by estimated fiber exposure
Fiber-years per cc
Elapsed No. of Years Since Onset of Work: Observed (BE)a
5-9 5-14 5-19 5-24 5-29
5-34
5-39
<6.0
98 79 178 165
188 206 214
6.0 - 11.9
0 40
180 212 228 248
12.0 - 24.9
.......... 0...... ......120
220
276
268 302 332
25.0 - 49.9
0 66 276 244
317 341 321
50.0 - 99.9
.......... 0...... 327
279
314
419 513 532
100.0 - 149.9 377 571 566 586
557 541 524
150.0 - 249.9 682 737 728 599
709 732 765
250.0 +
888 526
850
995
1,149
1,255
1,208
aBE, coding of cause according to best evidence available. See text for definition of all `asbestos" diseases.
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512 Seidman, Selikoff, and Gelb FIBER YEARS PER CUBIC CENTIMETER
<6.0 6.0- 11.9
12.0- 2*9
25.0- 49.9
50.0- 99.9 100.0-149.9
150.0-249.9 250.0 +
400
STANDARDIZED MORTALITY RATIO
500
Fig. 10. Ratio of cumulative observed to expected probabilities of dying from all causes from 5 through 40 elapsed years since onset of work in an amosite asbestos factory, 1941-1945, according to estimated
fiber exposure.
FIBER YEARS PER CUBIC CENTIMETER
STANDARDIZED MORTALITY RATIO
Fig. 11. Ratio of cumulative observed to expected probabilities of dying from lung cancer from 5 through 40 elapsed years since onset of work in an amosite asbestos factory, 1941-1945, according to estimated fiber exposure.
FIBER YEARS PER CUBIC CENTIMETER
100.0-149.9 150.0-249.9 250.0 +
1000
STANDARDIZED MORTALITY RATIO
Fig. 12. Ratio of cumulative observed to expected probabilities of dying from all "asbestos" diseases from 5 through 40 elapsed years since onset of work in an amosite asbestos factory, 1941-1945, according to estimated fiber exposure. See text for definition of all "asbestos diseases".
Long-
1800-
Standardized Mortality Ratio
' 1500-
1200-
90OH
600-1 300-L
0 25 50
Fig. 13. Fiber-years per cubic centii work in an amosite asbestos factory, exposure.
"susceptible" men through de after onset of work, the more p
5. Especially with lighter is necessary to evaluate the effe
ACKNOWLEDGMENTS
We wish to express our ir are particularly grateful to Edw their assistance in processing th Amy Manowitz, Shirley Levine investigations of the men in this ment of records, specimens, an<
Drs. J. Churg, Y. Suzuki Unit, reviewed the histological skilled basis for pathological c daily appreciate the learned guii level of fiber exposures to the v;
We are also deeply appreci clinicians, hospitals, coroners, s providing detailed information i mention must be made of the ki Center, Iris Salerno, ART, Jam St. Joseph's Hospital and Med Fontannetti, Frank Schell, MD Greater Paterson General Hosp Leone, MD, Allan S. Ellis, MI Shaw; Memorial Hospital, Patri Robert G. Rubin, MD, Patholo
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514 Seidman, Selikoff, and Gelb
ART, Aarend Schwinger, MD, and Edward Wagman, MD; Passaic General Hospital, Margaret VanDuyne, ART, Sigurd E. Johnsen, MD, John R. Gannon, MD, and their staffs; Valley Hospital, Pauline Wickner Carmichael, RRA, Thomas Maguire, MD, William O. Green, Jr, MD, and their staffs; East Orange Veterans Administration Hospital, Maimu Ohanian, MD, and Diethelm Boehme, MD, and their staffs. We also are indebted to many other colleagues in other hospitals including the Hackensack Hospital; Clara Maass Hospital, Bellville; East Orange General Hospital; Fair Lawn Memorial Hospital; Englewood Hospital; Greystone Hospital, Morris Plains; Irving ton General Hospital; Saddlebrook General Hospital; St. Mary's Hospital, Passaic; Good Samaritan Hospital, Suffem, N.Y.; Jersey City Medical Center; Horton Me morial Hospital, Scranton, PA; Point Pleasant Hospital; Hackettstown Community
Hospital, and the Dover General Hospital.
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An
Smoking, Morbidity, Group of Ex-Asbest
E.D. Richter, md, mph, H. Tu and D. Weiler, md
Thirty-three of 184 forme evaluate knowledge, attitud three subjects in this group symptom/sign-pulmonary ft ers smoked, and the majori than because of knowledge corned the offer of smokii nonsmokers, were at risk f tained subjects with impairr of breath, cough, rales, or greatly increased the odds t impairments would be foun one hour of person time ] material on smoking, and suggest that smoking alert needed, feasible, and accept
Key words: asbestos, smoking, puli
INTRODUCTION Smoking cessation in cur
their risk of premature death f complications of chronic respi basis for the smoking-asbesto proposals for similar action Committee," 1979; IEPS, 1976 The present work describes a practices concerning asbestos
The Division of Occupational Health School, and School of Public Health, J Histadrut Workers Federation, Divisic Kupat Holim Regional Pulmonary Ser Address reprint requests to E.D. Richi of Medical Ecology, Hebrew Universil Accepted for publication July 15, 198(
1986 Alan R. Liss, Inc.