Review Article

A Systematic Review of Carcinogenic Outcomes and Potential Mechanisms from Exposure to 2,4-D and MCPA in the Environment

Table 3

Cohort studies.

ReferenceMetricHDSTSNHLLeukemiaExposure

Lynge [107]SIRLymphoma = 1.12.72Lymphoma = 1.11.3Chlorophenoxy manufacturing workers; confidence intervals not provided

Wiklund et al. [96, 108, 109]SIRNR0.9 (0.8–1.0)NRNRMCPA, but including TCDD and other chlorophenoxy exposures

Wiklund et al. [76]SIR1.2 (0.6–2.16)NR1.01 (0.63–1.54)NRChlorophenoxy, but including TCDD and other exposures

Wiklund et al. [77]SIR1.02 (0.88–1.88)NR0.97 (0.89–1.06)NRChlorophenoxy, but including TCDD and other exposures

Bond et al. [110]SMRAll lymphomas 2.02 (0.06–4.6)2.2 (0.03–7.9)2,4-D manufacturing

Wiklund et al. [78]SIR1.2 (0.6–2.16)0.94 (0.34–2.04)1.01 (0.63–1.54)0.66 (0.28–1.21)MCPA dominates but many other compounds also

Corrao et al. [111]SIR1.4 (1.0–1.9) (all lymphomas, including NHL, HD)1.1 (0.8–1.5)Assumed chlorophenoxy

Wigle et al. [80]SMRNR0.89 (0.53–1.40)0.92 (0.75–1.11)0.88 (0.74–1.04)Chlorophenoxy

Coggon et al. [81]SMR0 (0.–9.76)0 (0–20.58)2.72 (0.33–9.73)NRChlorophenoxy

Bloemen et al. [112]SIRNRNR2.0 (0.2–7.1)NR2,4-D manufacturing; update to Bond [110]

Asp et al. [82] (10 yr latency)SIR1.18 (0.03–6.56)None observed0.42 (0.01–2.35)1.23 (0.25–3.59)Chlorophenoxy sprayers

Kogevinas et al. [83]SMR0.99 (0.48–1.82)2.00 (0.91–3.79)1.27 (0.88–1.78)1.00 (0.69–1.39)Chlorophenoxy and chlorophenols

Zahm [74]SMRNRNR1.14 (0.31–2.91)NRLawn applicators; 4 deaths

Lynge [86]SIRNR1.62 (0.4–4.1)1.10 (0.4–2.6)1.21 (0.49–2.50)Mostly MCPA, MCPP, some 2,4-D, and 2,4,5-T

Burns et al. [79]SMR1.54 (0.04–8.56)NR1.00 (0.21–2.92)1.30 (0.35–3.32)2,4-D manufacturing; Update to Bond [110]; Bloemen [112]

'T Mannetje et al [84]SMR0 (0.–16.1)4.28 (0.11–23.8)0.69 (0.02–3.84)1.16 (0.03–6.44)Chlorophenoxy sprayers, include dioxin, paraquat, and organophosphates

'T Mannetje et al [84]SMR5.58 (0.14–31.0)0 (0–19.3)0.87 (0.02–4.87)0 (0–5.29)Production workers

Jones et al. [89]SMR1.15 (0.74–1.78)0.96 (0.62–1.49)2.01 (1.38–2.93)1.02 (0.707–1.463)Chlorophenoxy manufacturing, but many with predominantly 2,4,5-T known to be contaminated with dioxin; meta-analysis of 20 studies

Boers [85] Factory ASMRNRNR0.92 (0.19–4.47)0.28 (0.03–2.61)Chlorophenoxy, solvents

Boers [85] Factory BSMRNRNRonly one case1.53 (0.22–10.82)MCPP, MCPA, and 2,4-D

Burns et al. [79]SIR0.97 (0.01–5.4)0.6 (0.01–3.3)1.2 (0.7–2.1)0.9 (0.4–1.8)2,4-D manufacturing; 1985–2007 cohort 1

Burns et al. [79]SIR1.05 (0.01–5.9)0.7 (0.01–3.6)1.4 (0.7–2.3)0.9 (0.4–2.0)2,4-D manufacturing; 1985–2007 cohort 2

Burns et al. [79]SIR1.3 (0.02–7.2)0.8 (0.01–4.5)1.7 (0.9–2.9)0.9 (0.3–2.0)2,4-D manufacturing; 1985–2007 cohort 3

SIR: standardized incidence ratio.
SMR: standardized mortality ratio.