TABLE 8-11Selected Epidemiologic Studies—Laryngeal Cancer (Shaded Entries Are New Information for This Update)

Study PopulationaExposed CasesbExposure of Interest/Estimated Relative Risk (95% CI)bReference
VIETNAM VETERANS
US Vietnam Veterans
US CDC Vietnam Experience Study—Cross-sectional study, with medical examinations, of Army veterans: 9,324 deployed vs 8,989 nondeployed All COIs 
Mortality
1965–200000.0 (nr)Boehmer et al., 2004
US VA Proportionate Mortality Study—sample of deceased male Vietnam-era Army and Marine veterans who served 7/4/1965–3/1/1973 All COIs 
1965–1988501.3 (nr)Watanabe and Kang, 1996
Army, deployed (n = 27,596) vs nondeployed (n = 31,757)501.4 (p < 0.05)
Marine Corps, deployed (n = 6,237) vs nondeployed (n = 5,040)40.7 (nr) 
International Vietnam-Veteran Studies
Australian Vietnam Veterans—58,077 men and 153 women served on land or in Vietnamese waters during 5/23/1962–7/1/1973 vs Australian population All COIs 
Incidence
All branches, 1982–2000971.5 (1.2–1.8)ADVA, 2005a
Navy211.5 (0.9–2.1)
Army691.6 (1.2–1.9) 
Air Force70.8 0.3–1.7) 
Mortality
All branches, return–2001281.1 (0.7–1.5)ADVA, 2005b
Navy61.1 (0.4–2.4)
Army191.1 (0.7–1.7) 
Air Force30.9 (0.2–2.5) 
1980–1994121.3 (0.7–2.2)CDVA, 1997a
Australian Conscripted Army National Service All COIs 
(18,940 deployed vs 24,642 nondeployed)
Incidence
1982–200080.7 (0.2–1.6)ADVA, 2005c
Mortality
1966–200120.4 (0.0–2.4)ADVA, 2005c
1982–199400 (0– > 10)CDVA, 1997b
OCCUPATIONAL—INDUSTRIAL
IARC Phenoxy Herbicide Cohort—Workers exposed to any phenoxy herbicide or chlorophenol (production or spraying) vs respective national mortality rates   
Mortality 1939–1992211.6 (1.0–2.5)Kogevinas et al., 1997
13,831 exposed to highly chlorinated PCDDs151.7 (1.0–2.8)
7,553 not exposed to highly chlorinated PCDDs51.2 (0.4–2.9) 
Mortality 1955–1988 of 12,492 production workers and 5,898 sprayers exposed—13,482 in exposed subcohort  Saracci et al., 1991
81.5 (0.6–2.9)
   
British MCPA Plant—Production 1947–1982 (n = 1,545) (included in IARC cohort) and spraying 1947–1972 (n = 2,561) (not included in IARC cohort) MCPA 
Mortality through 198341.7 (0.5–4.5)Coggon et al., 1986
German Production Workers at Boehringer–Ingelheim Plant in Hamburg (1,144 men working > 1 month in 1952–1984; generation of TCDD reduced after chloracne outbreak in 1954) and women—no results (some additions to observed cancers over Manz et al., 1991) (in Dioxins; 2,4,5-T; 2,5-DCP; 2,4,5-TCP 
IARC cohort as of 1997)
Mortality 1952–200773.5 (1.4–7.2)Manuwald et al., 2012
Men63.8 (1.4–8.2)
Women12.5 (0.0–13.9) 
Mortality 1952–1989—stats on men only, 1,184 (tables all for 1,148 men, not necessarily German nationals)22.0 (0.2–7.1)Manz et al., 1991
vs national rates (also vs gas workers); same observation period as Becher et al., 1966
New Zealand Phenoxy Herbicide Production Workers and Sprayers (1,599 men and women working any time in 1969–1988 at Dow plant in New Plymouth) (in IARC cohort) Dioxins; 2,4-D; 2,4,5-T; MCPA; MCPB; 2,4,5-TCP; Picloram 
Mortality 1969–2004  McBride et al., 2009a
Ever-exposed workers12.5 (0.1–14.0)
Never-exposed workers19.7 (0.2–54.3) 
Production Workers (713 men and 100 women worked > 1 month in 1969–1984)
Mortality 1969–20000nr't Mannetje et al., 2005
NIOSH Mortality Cohort (12 US plants, 5,172 male production and maintenance workers 1942–1984) (included in IARC cohort as of 1997) Dioxins, phenoxy herbicides 
Through 198772.1 (0.8–4.3)Fingerhut et al., 1991
≥ 1-year exposure, ≥ 20-year latency32.7 (0.6–7.8)
All Dow TCP-Exposed Workers (TCP production 1942–1979 or 2,4,5-T production 1948–1982 in Midland, Michigan) (in IARC and NIOSH cohorts) 2,4,5-T; 2,4,5-TCP 
1942–2003 (n = 1,615)31.3 (0.3–3.9)Collins et al., 2009a
All Dow PCP-Exposed Workers—all workers from the two plants that only made PCP (in Tacoma, Washington, and Wichita, Kansas) and workers who made PCP and TCP at two additional plants (in Midland, Michigan, and Sauget, Illinois) 2,4,5-T; 2,4,5-TCPRuder and Yiin, 2011
1940–2005 (n = 2,122)51.5 (0.5–3.4) 
PCP and TCP (n = 720)10.9 (0.0–5.1) 
PCP (no TCP) (n = 1,402)41.7 (0.5–4.3) 
Dow 2,4-D Production Workers (1945–1982 in Midland, Michigan) (subset of all TCP-exposed workers) 2,4-D, lower chlorinated dioxins 
Cancer incidence through 2007 in Dow workers (n = 1,256) vs comparisons from state cancer registries (n = 23,354) (Cohort 3)41.1 (0.3–2.9)Burns et al., 2011
Through 1982 (n = 878)13.0 (0.0–16.8)Bond et al., 1988
Dow PCP Production Workers (1937–1989 in Midland, Michigan) (not in IARC and NIOSH cohorts) Low chlorinated dioxins, 2,4-D 
Mortality 1940–2004 (n = 577, excluding 196 also having exposure to TCP)21.7 (0.2–6.2)Collins et al., 2009b
Mortality 1940–1989 (n = 770)22.9 (0.3–10.3)Ramlow et al., 1996
0-yr latency22.9 (0.4–10.3)
15-yr latency1nr 
OCCUPATIONAL—PAPER AND PULP TCDD 
WORKERS
IARC cohort of pulp and paper workers—60,468 workers from 11 countries, TCDD among 27 agents assessed by JEM  McLean et al., 2006
Exposure to nonvolatile organochlorine compounds
Never180.9 (0.5–1.5) 
Ever201.2 (0.8–1.9) 
OCCUPATIONAL—HERBICIDE-USING
WORKERS (not related to IARC sprayer cohorts)
DENMARK
Danish gardeners (n = 3,124) exposed to pesticides90.7 (0.3–1.4)Kenborg et al., 2012
ITALIAN Licensed Pesticide Users—male farmers in southern Piedmont licensed 1970–1974
Mortality 1970–1986 (n = 23,401)250.5 (0.3–0.7)Torchio et al., 1994
Italian rice growers with documented phenoxy use (n = 1,487) Phenoxy herbicidesGambini et al., 1997
 70.9 (0.4–1.9) 
NEW ZEALAND National Cancer Registry (1980–1984)—case-control study of 303 incident laryngeal cancer cases vs remainder of 19,904 men with any incident cancer HerbicidesReif et al., 1989
Forestry workers (n = 134)21.1 (0.3–4.7) 
SWEDEN
Swedish lumberjacks—used phenoxys 1954–1967, Incidence 1958–1992  Thörn et al., 2000
Exposed (n = 154)
Foremen (n = 15)0nr 
THE NETHERLANDS
Dutch Licensed Herbicide Sprayers—1,341 certified before 1980
Through 200011.0 (0.0–5.1)Swaen et al., 2004
UNITED STATES
US farmers—usual occupation of farmer and industry of agriculture on death certificates 1984–1988 from 23 states Herbicides PCMRsBlair et al., 1993
Men
Whites (n = 119,648)1620.7 (0.6–0.8) 
Nonwhites (n = 11,446)321.1 (0.8–1.5) 
Women
Whites (n = 2,400)0nr (0.0–3.3) 
Nonwhites (n = 2,066)0nr (0.0–4.8) 
ENVIRONMENTAL
Seveso, Italy Residential Cohort—Industrial accident July 10, 1976 (723 residents Zone A; 4,821 Zone B; 31,643 Zone R; 181,574 local reference group) TCDD 
Mortality
25-yr followup to 2001—men and women, all respiratory cancers (ICD-9 160–165) excluding lung cancers (ICD-9 162)  Consonni et al., 2008
Zone A0nr 
Zone B≤ 8nr 
Zone R≤ 49nr 
20-yr followup to 1996—men and women, all respiratory cancers (ICD-9 160–165) excluding lung cancers (ICD-9 162)  Bertazzi et al., 2001
Zone A0nr 
Zone B8nr 
15-yr followup to 1991—men  Bertazzi et al., 1997, 1998
Zone B6nr 
Zone R32nr 
15-yr followup to 1991—women  Bertazzi et al., 1997, 1998
Zone B0nr 
Zone R6nr 
Ecological Study of Residents of Chapaevsk, Russia DioxinRevich et al., 2001
Incidence—Crude incidence rate in 1998 vs
Men
Regional (Samara) 0 
National (Russia) 11.3 
Women
Regional (Samara) 0 
National (Russia) 0.4 
Mortality—1995–1998 (SMR vs regional rates)
Men132.3 (1.2–3.8) 
Women10.1 (0.0–0.6) 

NOTE: 2,4-D, 2,4-dichlorophenoxyacetic acid; 2,4-DP, dichlorprop; 2,4,5-T, 2,4,5-trichlorophenoxyacetic acid; 2,4,5-TCP, 2,4,5-trichlorophenol; 2,5-DCP, 2,5-dichlorophenol; CDC, Centers for Disease Control and Prevention; CI, confidence interval; COI, chemical of interest; IARC, International Agency for Research on Cancer; ICD, International Classification of Diseases; JEM, job–exposure matrix; MCPA, 2-methyl-4-chlorophenoxyacetic acid; MCPB, 4-(4-chloro-2-methylphenoxy)butanoic acid; NIOSH, National Institute for Occupational Safety and Health; nr, not reported; PCDD, polychlorinated dibenzo-p-dioxin (highly chlorinated, if four or more chlorines); PCMR, proportionate cancer mortality ratios; PCP, pentachlorophenol; SMR, standardized mortality ratio; TCDD, 2,3,7,8-tetrachlorodibenzo-p-dioxin; TCP, trichlorophenol; VA, US Department of Veterans Affairs.

a

Subjects are male and outcome is mortality unless otherwise noted.

b

Given when available; results other than estimated risk explained individually.

From: 8, Cancer

Cover of Veterans and Agent Orange
Veterans and Agent Orange: Update 2012.
Committee to Review the Health Effects in Vietnam Veterans of Exposure to Herbicides (Ninth Biennial Update); Board on the Health of Select Populations; Institute of Medicine.
Washington (DC): National Academies Press (US); 2014 Mar 6.
Copyright 2014 by the National Academy of Sciences. All rights reserved.

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