Evidence on the Carcinogenicity of C.I. Disperse …. Disperse Yellow 3 Uses Office of Environmental...
Transcript of Evidence on the Carcinogenicity of C.I. Disperse …. Disperse Yellow 3 Uses Office of Environmental...
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Evidence on the Carcinogenicity of C.I. Disperse Yellow 3
January 25, 2013 Meeting of the Carcinogen Identification Committee
Cancer Toxicology and Epidemiology Section
Reproductive and Cancer Hazard Assessment Branch
Office of Environmental Health Hazard Assessment 1
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Identity of C.I. Disperse Yellow 3
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NN
OH
CH3
NH
O
CH3
CAS-RN: 2832-40-8
• Molecular Formula: C15H15N3O2
• Molecular Weight: 269.30 • Chemical Class: monoazo dye • Chemical Appearance: powder • Water Solubility: 1.18 mg/L (at 25°C)
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C.I. Disperse Yellow 3 Uses
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• A textile dye for coloring nylon, polyvinyl chloride and acrylic fibers, wools, furs, cellulose acetate, polystyrene, and other thermoplastics
• Products include clothing, hosiery, and carpeting
• Dyes in ink products, and in pulp and paper manufacture
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Occurrence of C.I. Disperse Yellow 3
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• Primarily used in dyeing of synthetic textiles such as yarns, fabrics, and carpets.
• Populations potentially exposed: – Workers in synthetic textile manufacturing
• Example: is one of 39 disperse dyes known to cause contact allergic dermatitis in textile workers.
– General public using synthetic textiles • Example: allergic eczema is associated with
nylon hosiery containing C.I. Disperse Yellow 3.
CI Disperse Yellow 3 at
various concentrations on
polyester fabric
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Potential Exposures to C.I. Disperse Yellow 3 in Textile Manufacturing
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• Dyeing with C.I. Disperse Yellow 3 – Yarn stage
• Batch dyeing machines.
– Fabric/carpet stage • Continuous and batch dyeing machines.
• Handling of dyed yarns, fabrics, and carpets. – Exposure to CI DY3 (dermal and respiratory)
may be more likely in handling than in dyeing.
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Carcinogenicity Studies in Humans
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• There are no epidemiology studies of humans with documented exposure to C.I. Disperse Yellow 3.
• There are four epidemiology studies of textile workers with potential exposure. – All four studies were of bladder cancer only. – All four were case-control design. – Three were conducted in Spain, one in New Zealand. – All four used interviewer-administered questionnaires to
collect exposure data – All four used standard occupation/industry coding. One
(Serra et al. 2008) additionally used detailed questions about the textile manufacturing workplace.
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Epidemiology study: Gonzales et al., 1988
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• Case-control study in Spain. – Incident cases from one hospital. – Deceased cases from a local death registry.
• 57 bladder cancer cases identified 1978 -1981. • 107 hospital and deceased controls • “Textile dyeing or printing” OR=4.41, 95% CI= 1.15-16.84,
based on 8 exposed cases and 3 exposed controls. • C.I. Disperse Yellow 3 was among 72 dyes mentioned in
article. • Limitation: most subjects deceased (75%) by time of
interview, requiring proxy interview (e.g. with spouse).
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Epidemiology study: Gonzales et al., 1989
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• Case-control study in Spain – Incident cases from 12 hospitals in four geographic regions.
• 497 bladder cancer cases (438 male & 59 female) occurred 1985 -1986.
• Two control groups – Hospital – General population.
• “Textile dyers” OR=1.29, 95% CI= 0.5-3.1, based on 11 exposed cases and 17 exposed controls.
• C.I. Disperse Yellow 3 was not mentioned in the article.
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Epidemiology study: Dryson et al., 2008
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• Case-control study in New Zealand – Cases from nationwide cancer registry.
• 213 bladder cancer cases occurring 2003 -2004. • 471 controls from general population. • “Textile products machine operators - textile bleaching,
dyeing, and cleaning” OR=0.81, 95% CI=0.19-3.54, based on three exposed cases and 10 exposed controls).
• C.I. Disperse Yellow 3 was not mentioned in the article.
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Epidemiology study: Serra et al., 2008
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• Case-control design at 18 hospitals in Spain. • 1,182 bladder cancers (1,065 male, 117 female) 1998-2001. • 1,221 controls from the same hospitals. • Interviewer-administered questionnaires with module
designed specifically for textile industry. • “Winding, warping, and sizing” with “synthetic” materials
(OR=15.39, 95% CI=1.89-125.29, based on 11 exposed cases and 1 exposed control).
• “Synthetic” materials 10+ years (OR=2.62, 95% CI 1.14-6.01, based on 21 exposed cases and 9 exposed controls)
• C.I. Disperse Yellow 3 was not mentioned in the article.
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• National Toxicology Program (NTP), 1982 • F344 rats (males, females) - 50 animals/sex/dose - 0, 5,000 or 10,000 ppm in feed for 103 weeks and terminated by 104 weeks. • Liver and stomach tumors were observed in males
Two Carcinogenicity Studies in Rats
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Organ Tumor Dose group (ppm) Trend
test p value 0 5000 10000
Liver
Hepatocellular adenoma 1/31 15/45** 10/39* <0.05
Combined hepatocellular adenoma and carcinoma
2/31 15/45** 11/39* <0.05
Stomach
Glandular portion: Combined adenoma, mucinous adenocarcinoma, and sarcoma
0/30 2/45 1/39 NS
Non-glandular portion: Combined squamous cell papilloma and fibrosarcoma
0/30 2/45 0/39 NS
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Feed Studies in Male F344 Rats
Pairwise comparison with controls; * p<0.05, ** p<0.01
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Feed Studies in Female F344 Rats
• No treatment-related tumors were observed
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• National Toxicology Program (NTP), 1982 • B6C3F1 mice (males, females) - 50 animals/sex/dose - 0, 2,500 or 5,000 ppm in feed for 103 weeks and terminated by 104 weeks. • Lung tumors in males. • Hematopoietic system and liver tumors in
females.
Two Carcinogenicity Studies in Mice
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Feed Studies in Male B6C3F1 Mice
Pairwise comparison with controls; * p<0.05, # p=0.055
Organ Tumor Dose group (ppm) Trend
test p value 0 2500 5000
Lung
Alveolar/bronchiolar adenoma 2/47 6/42 9/46* < 0.05
Combined alveolar/bronchiolar adenoma and carcinoma
3/47 7/42 9/46# < 0.05
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Pairwise comparison with controls; * p<0.05, ** p<0.01 16
Feed Studies in Female B6C3F1 Mice
Organ Tumor Dose group (ppm) Trend test
p value 0 2500 5000
Hemato-poietic System
Malignant lymphoma 10/50 16/50 19/50* < 0.05
Combined malignant lymphoma and leukemia
10/50 17/50 20/50* <0.05
Liver
Hepatocellular adenoma 0/50 6/47* 12/46** <0.001
Hepatocellular carcinoma 2/50 4/47 5/46 NS
Combined hepatocellular adenoma and carcinoma
2/50 10/47* 17/46** <0.001
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Genotoxicity in Non-mammalian Species
•Salmonella reverse mutations - Positive: TA 97, 98, 1537, 1538 strains (+/-S9), and
100 (+S9) strains - Negative: TA 100 (-S9) and 1535 (+/-S9) strains •Chromosomal aberrations in Frog larvae - Positive •Sex-linked recessive lethal mutations in Drosophila - Negative
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In Vitro Genotoxicity in Mammalian Species
• Mouse lymphoma forward mutations - Positive: 2 tests (+S9) - Negative: 3 tests (-S9)
• Sister chromatid exchange in CHO cells - Positive: 1 test (+S9), 1 test (-S9) - Negative: 1test (-S9)
• Chromosomal Aberrations in CHO cells - Negative (+/-S9)
• Unscheduled DNA synthesis in rat hepatocytes - Positive (-S9)
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In Vivo Genotoxicity in Mammalian Species Negative
• Micronucleus induction in mouse bone marrow
• DNA damage in rat liver
In Vitro Cell Transformation Negative
• BALB/c 3T3 mouse cells (-S9)
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Pharmacokinetics and Metabolism
• Absorption – Dermal absorption is expected – Oral absorption is inferred – Inhalation unknown
• Azoreduction – Azo dyes undergo reductive cleavage of the azo
bond and form aromatic amine metabolites – Metabolites: 4-Aminoacetanilide and 2-Amino-
p-cresol
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Proposed Mechanism Of Azo Reduction
Adapted from Levine (1991)
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C.I. Disperse Yellow 3 and its Expected Metabolites
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C.I. Disperse Yellow 3
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Genotoxicity of Metabolites
Chemical Genotoxicity
In vitro In vivo
4-Aminoacetanilide Salmonella reverse mutation
Mouse bone marrow; chromosomal aberrations
2-Amino-p-cresol
Salmonella reverse mutation; mouse lymphoma forward mutation
Not tested
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Structurally Related Chemicals
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C.I. Disperse Yellow 3 Azobenzene
Prop 65 listed IARC 3
p-Aminoazobenzene
NN
OH
CH3
NH
O
CH3
NN
NN
H2N
o-Aminoazotoluene
Prop 65 listed IARC 2B
Oil Orange SS
Prop 65 listed IARC 2B
NN
NH2
CH3
CH3
NN
OH
CH3
Prop 65 listed IARC 2B
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Structurally Related Chemicals
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C.I. Disperse Yellow 3 4-Aminoacetanilide 2-Amino-p-cresol
NN
OH
CH3
NH
O
CH3
2,4-Diaminotoluene
Prop 65 listed IARC 2B
2-Aminotoluene
Prop 65 listed IARC 1
Phenacetin
Prop 65 listed IARC 2A
NH2
NH
O
CH3
H3C NH2
OH
CH3
H2N NH2
CH3
NH2
CH3O
NH
H3C
O
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Carcinogenicity of Structurally Related Chemicals
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Chemical Liver Other Sites
Mice Rats Mice Rats
C.I. Disperse Yellow 3 F M
F (hematopoietic system)
M (lung) M (Stomach)
Azobenzene M M (spleen)
p-Aminoazobenzene M M M (skin)
o-Aminoazotoluene MF MF MF (lung)
F (soft tissues) MF (lung)
Oil Orange SS MF (bladder)
M (intestinal)
2,4-Diaminotoluene F MF M (kidney, skin)
F (mammary, lymphoma)
2-Aminotoluene F MF (blood vessels)
M (abdominal, scrotum, skin, spleen)
F (mammary, bladder, spleen)
Phenacetin M(urinary tract) MF (urinary tract, nasal cavity)
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Possible Mechanisms of Action
• Genotoxicity - Mutagenicity and clastogenicity by the
parent compound and metabolites - Structural similarity with carcinogenic
monoazo compounds and related aromatic amines that are genotoxic
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Summary of Human Evidence
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• Four case-control studies of bladder cancer risk among textile workers.
• Exposure-related limitations of all four studies: – C.I. Disperse Yellow 3 was just one of many disperse
dyes used. C.I. DY3 was mentioned in only one study. – No exposure measures or cancer risk results for
specific dyes. • Two of the four reported significant associations for jobs
with potential exposure to C.I. Disperse Yellow 3. • The studies are inadequate to assess the relationship
between C.I. Disperse Yellow 3 exposure and cancer risk.
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F344 rats
•Males: - Benign and combined malignant / benign liver tumors -Rare stomach tumors
•Females: -No treatment-related tumors
Summary Of Animal Evidence
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B6C3F1 mice
•Males: - Benign and combined malignant/benign lung tumors •Females: - Hematopoietic system tumors
- Benign and combined malignant / benign liver tumors
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Summary Of Other Relevant Evidence
• In vitro genotoxicity in a variety of systems • Metabolism to genotoxic metabolites • Structurally similar to other carcinogens
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